Improvement of Fatigue Strength of Ti–6Al–4V Alloy by Hybrid Surface Treatment Composed of Plasma Nitriding and Fine-Particle Bombarding

• Morita Tatsuro

  Department of Mechanical and System Engineering, Graduate School of Science and Technology, Kyoto Institute of Technology

• Uehigashi Noriaki

  Compressor Division, Toyota Industries Corporation

• Kagaya Chuji

  Department of Mechanical Engineering, Chubu University

書誌事項

タイトル別名

• Improvement of Fatigue Strength of Ti–6Al–4V Alloy by Hybrid Surface Treatment Composed of Plasma Nitriding and Fine-Particle Bombarding

抄録

This study was conducted to improve the fatigue strength of Ti–6Al–4V alloy by hybrid surface treatment composed of plasma nitriding and fine-particle bombarding (FPB). Plasma nitriding to form a hardened layer was performed at relatively low temperature to suppress the growth of the microstructure of the substrate as far as possible. Subsequent FPB eliminated the outermost brittle compound layer leading to a reduction in fatigue strength, and also introduced compressive residual stress at the same time. Hybrid surface treatment formed a hardened layer that can improve wear resistance without marked deterioration of the mechanical properties. Since the formed layer possessed high compressive residual stress and relatively high hardness, initiation of fatigue cracks from the surface was strongly suppressed and the crack initiation site was located in the substrate under the formed layer. As a result, the fatigue strength improved by 47% and the fatigue ratio (fatigue strength/tensile strength) reached a very high level of 91%.

収録刊行物

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 54 (9), 1719-1724, 2013

  公益社団法人 日本金属学会

キーワード

• titanium alloy
• titanium–6aluminum–4vanadium
• plasma nitriding
• fine-particle bombarding
• hybrid surface treatment
• mechanical properties
• fatigue strength
• compound layer
• hardened layer
• hardness
• compressive residual stress
• internal fracture

詳細情報

• CRID: 1390001204249070080
• NII論文ID: 10031194662
• NII書誌ID: AA1151294X
• DOI: 10.2320/matertrans.m2013228
• COI: 1:CAS:528:DC%2BC3sXhslejtrbK
• ISSN: 13475320
• ISSN: 13459678
• NDL書誌ID: 024795338
• Web Site: http://id.ndl.go.jp/bib/024795338
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I024795338
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/54/9/54_M2013228/_pdf
• 本文言語コード: en
• データソース種別:
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  • NDL
  • Crossref
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  • KAKEN
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