Internal Residual Strain Mapping in Carburized Chrome Molybdenum Steel after Quenching by Neutron Strain Scanning

• SAKAIDA Yoshihisa

  Dept. Mech. Eng., Shizuoka Univ.

• SERIZAWA Takanobu

  Graduate school of Eng., Shizuoka Univ.

• MANZANKA Michiya

  Motorcycle Headquarters, Yamaha Motor Co., Ltd.

Bibliographic Information

Other Title

• 中性子ひずみスキャニングによる浸炭焼入したクロムモリブデン鋼内部の残留ひずみ測定
• チュウセイシヒズミ スキャニング ニ ヨル シンタン ヤキイレ シタ クロム モリブデン コウ ナイブ ノ ザンリュウヒズミ ソクテイ

Abstract

A hollow circular cylinder specimen with an annular U-notch of chrome molybdenum steel with 0.20 mass% C (SCM420) was carburized in carrier gas and quenched in oil bath. In order to determine the case depth, the specimen was cut off and carbon content and Vickers hardness gradients were measured experimentally near the carburized surface. The residual strain mapping in the interior of carburized cylinder was conducted nondestructively by neutron strain scanning. In this study, the neutron diffraction from Fe-211 plane was used for strain scanning. The neutron wavelength was tuned to 0.1654nm so that diffraction angle became about 90°. Radial, hoop and axial residual strains were measured by scanning diffracting volume along the axial direction of cylinder specimen. Each residual strain was calculated from lattice spacing change. Unstressed lattice spacing was determined experimentally using reference coupon specimens that were cut from the interior of same carburized cylinder. As a result, the diffraction peak width at half height, FWHM, near the carburized surface was about 3.7 times wider than that of coupon specimens. On the other hand, the most peak widths in the interior equaled to that of coupon specimens. Peak width broadened slightly as the diffracting volume approached the carburized case layer. From the center to the quarter of cylinder specimen, the hoop and axial strains were tensile, and the radial one was compressive in the interior. From the quarter to the edge of the cylinder specimen, the hoop tensile strain increased, radial and axial strains changed to tensile and compressive, respectively. Therefore, the interior of the cylinder specimen was found to be deformed elastically to balance the existence of compressive residual stresses in the carburized case layer.

Journal

• Journal of the Society of Materials Science, Japan

  Journal of the Society of Materials Science, Japan 60 (7), 630-635, 2011

  The Society of Materials Science, Japan

Keywords

• Chrome molybdenum steel
• Neutron strain scanning
• Internal residual strain
• Carburizing
• Quenching

Details

• CRID: 1390282680422719360
• NII Article ID: 130001027655
• NII Book ID: AN00096175
• DOI: 10.2472/jsms.60.630
• COI: 1:CAS:528:DC%2BC3MXhtVahsLbK
• ISSN: 18807488
• ISSN: 05145163
• NDL BIB ID: 11186607
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I11186607
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed