Search Results 1-20 of 801

  • Numerical Simulation on Effect of Microstructure on Hydrogen-induced Cracking Behavior in Duplex Stainless Steel Weld Metal

    Ogita Gen , Matsumoto Koki , Mochizuki Masahito , Mikami Yoshiki , Ito Kazuhiro

    … <p>Duplex stainless steels and their deposited weld metal have ferrite and austenite microstructures with different material properties. … In addition, the microstructure of the base metal and weld metal clearly differs, affecting hydrogen diffusion and accumulation, and hydrogen-induced cracking behavior at the microstructural scale. …

    ISIJ International 61(4), 1236-1244, 2021

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  • Modelling of Hydrogen Diffusion in a Weld Cold Cracking Test: Part 2, Numerical Calculations

    Kasuya Tadashi , Yokobori A. Toshimitsu , Ozeki Go , Ohmi Toshihito , Enoki Manabu

    … We firstly conducted a y groove weld cracking test using 980 MPa grade steel and 780 MPa grade welding consumable to observe HAZ cracking. … The calculation results of the under-match case show that hydrogen tends to accumulate in the stress concentration area of both the HAZ and the weld metal, which indicates crack may occur in both the HAZ and the weld metal. …

    ISIJ International 61(4), 1254-1263, 2021

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  • Modelling of Hydrogen Diffusion in a Weld Cold Cracking Test: Part 1, Experimental Determinations of Apparent Diffusion Coefficient and Boundary Condition

    Kasuya Tadashi , Yokobori A. Toshimitsu , Ozeki Go , Ohmi Toshihito , Enoki Manabu

    … <p>Weld cold cracking is a kind of hydrogen embrittlement and is a serious problem when high strength steel is concerned. … Cold cracking usually occurs at the area where hydrogen locally accumulates, and hence hydrogen diffusion modelling is important to understand the hydrogen distribution in a welded joint. …

    ISIJ International 61(4), 1245-1253, 2021

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  • Effect of Alloying Elements on Solidification Cracking Susceptibility of High Manganese Austenitic Steel  [in Japanese]

    YAMASHITA Shotaro , UEDA Keiji , TAKADA Atsushi , IZUMI Daichi , SAHARA Naoki , OGURA Tomo , SAIDA Kazuyoshi

    … This paper reports on the effect of carbon, silicon, manganese, chromium and aluminum on solidification cracking susceptibility of high manganese steel. … The solidification cracking susceptibility of high manganese steel has been evaluated by using trans-Varestraint test and BTR that is one of the evaluation index of the solidification cracking susceptibility was obtained and compared. …

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 39(1), 87-96, 2021

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  • Cause of Cracking at Weld Corner of MIG-Welded 5083 Aluminum Alloy in HG-SCC Test  [in Japanese]

    GHORANI Alireza , ITOH Goro , OHBUCHI Tomoyuki

    … we applied humid gas stress corrosion cracking <tt>(</tt>HG-SCC<tt>) </tt>test to metal inert gas <tt>(</tt>MIG<tt>) </tt>welded 5083 plate with an attention to the location of the pre-crack, and revealed that stress corrosion cracking <tt>(</tt>SCC<tt>) </tt>based on hydrogen embrittlement <tt>(</tt>HE<tt>) </tt>only progressed at weld metal region adjacent to base metal …

    Journal of Light Metal Welding 59(1), 18-24, 2021

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  • Characterization of Hot Cracking in Multi-Pass Weld Metal of High Manganese Austenitic Steel  [in Japanese]

    UEDA Keiji , YAMASHITA Shotaro , TAKADA Atsushi , SAHARA Naoki , OGURA Tomo , SAIDA Kazuyoshi

    … In multi-pass welding of high manganese austenitic steel, weld metal is solidified in austenite single phase and hot cracking may occur depending on residual stress. … In order to identify the cracking morphology, a fracture surface of the cracking of weld metal in multi-pass welding test was observed. …

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 38(4), 297-305, 2020

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  • Effect of Solute Elements on Solidification Cracking Susceptibility of Carbon Steel:– Prevention of Pear-Shaped Bead Cracking in Carbon Steel Weld Metal –  [in Japanese]

    YAMASHITA Shotaro , HAMADA Ryosuke , ONO Kazuhiko , LAN Weiming , ASADA Tsuyoshi , OGURA Tomo , SAIDA Kazuyoshi

    … Solidification cracking susceptibility of carbon steels was evaluated by the transverse-Varestraint test to reveal the fundamental effect of solute elements in the steel such as carbon, silicon, manganese, phosphorus and sulfur. … Fracture surface of a pear-shaped bead cracking occurred in a weld metal of the carbon steel by GMAW exhibited the characteristic features of solidification cracking. …

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 38(4), 316-324, 2020

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  • Estimation of Critical Strain Caused by Solidification Shrinkage during Weld Solidification  [in Japanese]

    FUKUMOTO Shigeo , YOSHIOKA Yuma

    … MPF (Multi-Phase Field) method was applied for the microstructure formation process of Fe-18%Cr-15%Ni-0.05%C alloy during weld solidification and critical strain rate due to solidification shrinkage in the mushy zone was calculated by RDG (Rappaz-Drezet-Gremaud) model. … Estimated critical strain for the solidification cracking was corresponding to the experimental result of trans-varestraint test by adjusting the dendrite coalescence temperature and the vulnerable time. …

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 38(4), 291-296, 2020

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  • A STUDY ON WELDABILITY OF HIGH STRENGTH REINFORCING BARS (PART 1): EVALUATION BY WELD CRACKING  [in Japanese]

    YABE Yoshitaka , NARIHARA Hiroyuki , NAKAGOMI Tadao

    weld cracks in welds do not occur and the heat-affected zone fractures which lead to decline the joint performance do not occur.</p><p> In this study (part1), at first, focusing on weld cracking, we investigated experimentally the effect of changes of indices such as the carbon content, the carbon equivalent, and the weld cracking susceptibility composition of high strength reinforcing bars on occurrence of weld

    Journal of Structural and Construction Engineering (Transactions of AIJ) 85(770), 455-461, 2020

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  • Evaluation of Crack Sensitivity of Aluminum Alloy Welds by Various Cracking Tests  [in Japanese]

    Okubo Michinori , Nagai Kaori , Shinoda Kiyoshi

    … The weld crack sensitivity of aluminum alloys is influenced by factors such as the welding process, base metal, filler metal, welding conditions, stress, and restraint. … In this work, crack sensitivity is evaluated by ten-sile-restraint crack test and self-restraint crack test. … In the tensile-restraint crack test, TIG welding was performed on 0.8-mm-thick plates of A2017 (Al-Cu) and A6061 (Al-Mg-Si). …

    Journal of Light Metal Welding 58(Supplement), 24s-28s, 2020

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  • Low cycle fatigue evaluation of cruciform welded joints containing incomplete penetration  [in Japanese]

    Hanji Takeshi , Ohashi Yuko , Tateishi Kazuo , Shimizu Masaru

    … Six types of specimens with different sizes of weld penetrations and weld leg lengths were tested under cyclic plastic strains. … The test results revealed that the fatigue strength and cracking patterns depend on the ratio of the weld penetration to the main plate thickness and the ratio of the weld leg length to the main plate thickness, respectively. …

    Journal of Structural Engineering, A 66A(0), 253-263, 2020

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  • Numerical Simulation on Effect of Microstructure on Hydrogen-induced Cracking Behavior in Duplex Stainless Steel Weld Metal  [in Japanese]

    Ogita Gen , Matsumoto Koki , Mochizuki Masahito , Mikami Yoshiki , Ito Kazuhiro

    … <p>Duplex stainless steels and their deposited weld metal have ferrite and austenite microstructure, which have material properties that are different. … In addition, the microstructure of the base metal and weld metal are clearly different; … therefore, it affects the hydrogen diffusion and accumulation, and hydrogen-induced cracking behavior at the microstructural scale. …

    Tetsu-to-Hagane 106(4), 224-234, 2020

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  • Prevention of Cold Cracking by the Welding Process for Reducing Diffusible Hydrogen in High-Tensile Thick Plate Welding  [in Japanese]

    MUKAI Naoki , INOUE Yoshihide , SASAKURA Shuji , KINOSHITA Yuta

    … Cold cracking sensibility is severe problem in the welding fabrication of large-scale steel structures. … It is well-known that diffusible hydrogen content in the weld metal strongly influences this cracking. … By using this process, amount of hydrogen content in the weld metal can be highly reduced than the conventional process. …

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 38(1), 41-51, 2020

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  • Hot Cracking Susceptibility of Commercial Filler Metals for Alloy 617 by Varestraint Test:-Study of Hot Cracking of Alloy 617 in Multipass Welds-  [in Japanese]

    YAMASHITA Shotaro , KAMIMURA Kenji , NIKI Takahiro , OGURA Tomo , SAIDA Kazuyoshi

    … Solidification cracking and liquation cracking susceptibility of four kinds of alloy 617 commercial filler metals were evaluated by Varestraint test, in order to clarify a fundamental effect of each solute element in the alloy. … Fracture surface of cracking in alloy 617 multipass welds by GTA welding exhibited a possibility of occurrence of both solidification cracking and liquation cracking. …

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 38(1), 1-10, 2020

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  • Humid Gas Stress Corrosion Cracking in MIG-Welded 5083 Aluminum Alloy Plate

    Ghorani Alireza , Itoh Goroh , Ohbuchi Tomoyuki , Kiuchi Tomoya

    … The local Mg content will become higher than 5% due to solidification segregation in the weld joint of 5083 alloy. … In this study, resistance to HE of MIG-welded 5083 aluminum alloy at three areas (weld center, weld corner and HAZ) was investigated by newly developed humid gas stress corrosion cracking (HG-SCC) test. …

    MATERIALS TRANSACTIONS 61(2), 330-338, 2020

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  • Evaluation of Reheat Cracking Susceptibility in High Strength Austenitic Stainless Steels  [in Japanese]

    NOMURA Kyohei , KUBUSHIRO Keiji

    … <p>In order to assess the susceptibility to reheat cracking of high-strength austenitic stainless steels of KA-SUS304J1HTB and KA-SUS310J1TB, we established a reheat cracking reproduction test method by using stress relaxation test. … A HAZ-reproduction test piece of KA-SUS304J1HTB fractured during stress relaxation at 650°C when the strain exceeded 16.6%. …

    Journal of the Society of Materials Science, Japan 69(1), 105-110, 2020

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  • FUNDAMENTAL STUDY ON LIQUID METAL ASSISTED CRACKING OCCURRED AT VENT AND DRAIN HOLES DURING HOT-DIP GALVANIZING  [in Japanese]

    ASADA Hayato , TANAKA Tsuyoshi , YAMASHITA Tatsuo , FUJIWARA Yuki

    … In this process, liquid metal assisted cracking (LMAC) has sometimes occurred at vent and drain holes which were located at the corner of welded beam-to-column connection during hot-dip galvanizing. … As the pilot study, Immersion tests were performed with scaled test specimens to investigate the thermal and strain histories due to the thermal expansion and contraction in hot-dip galvanizing process. …

    Journal of Structural and Construction Engineering (Transactions of AIJ) (762), 1033-1042, 2019-08

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  • SCC Growth Behavior of Welds and Cast of Stainless Steels in Oxygenated High-Temperature Water : Influence of Water Chemistry and Test Temperature  [in Japanese]

    山田 卓陽 , 寺地 巧 , 岡本 マキエ , 有岡 孝司

    INSS journal : Journal of the Institute of Nuclear Safety System 26, 136-144, 2019

  • SCC Potential Assessment in Butt Welded Zone of Medium-Diameter Pipe  [in Japanese]

    NAKANO Yosuke , TOYOSHIMA Yoshiteru , ISHII Yuya , MIYATA Yuka , YANAGIDA Nobuyoshi

    … <p>The purpose of this study is to evaluate the risk of Stress Corrosion Cracking (SCC) initiation to medium-diameter 200A and 250A low-carbon stainless steel piping. … The residual stress was obtained by analysis and mock-up test which represent welding of actual piping. … The analysis of the residual stress was validated by the measurement results of the mock-up test. … The hardness was measured by same mock-up test. …

    The Proceedings of the Materials and Mechanics Conference 2019(0), OS1304, 2019

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  • The Effect of Cold Cracking Prevention of FCAW by the Welding Process for Reducing Diffusible Hydrogen  [in Japanese]

    MUKAI Naoki , INOUE Yoshihide , TASHIRO Shinichi , SUGA Tetsuo , TANAKA Manabu

    … Cold cracking sensibility is severe problem in the welding fabrication of large-scale steel structures. … It is well-known that diffusiblehydrogen content in the weld metal strongly influences this cracking. … Byusing this process, amount of hydrogen content in the weld metal can be highly reduced than the conventional process. … In this study,the effect of cold cracking prevention in FCAW by new low hydrogen process was confirmed. …

    Journal of Smart Processing 9(1), 33-37, 2019

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