Creation of Fine Grained-Layer and High Hardness-Layer Using IH-FPP Treatment System and Its Effect on the Fatigue Properties of Steel

• HARADA Tsubasa

  Keio Univ.

• KIKUCHI Shoichi

  Ritsumeikan Univ.

• KOMOTORI Jun

  Keio Univ.

• FUKAZAWA Kengo

  Neturen Co., Ltd.

• MISAKA Yoshitaka

  Neturen Co., Ltd.

• KAWASAKI Kazuhiro

  Neturen Co., Ltd.

Bibliographic Information

Other Title

• ＩＨ－ＦＰＰ処理システムを利用した微細結晶粒・高硬さ表面の創製と鋼の疲労特性に及ぼすその効果
• IH-FPP ショリ システム オ リヨウ シタ ビサイ ケッショウリュウ ・ タカ カタサ ヒョウメン ノ ソウセイ ト ハガネ ノ ヒロウ トクセイ ニ オヨボス ソノ コウカ

Abstract

In order to improve the fatigue properties of SCM435H steel, a surface treatment system was developed that combines high-frequency induction heating (IH) with fine particle peening (FPP). In this IH-FPP system, a compressed air spray from the FPP nozzle rapidly cools the specimen surface, which is pre-heated by the IH system. The specimen surface can be simultaneously modified by plastic deformation and quenching. The IH-FPP process was performed at temperatures ranging from 400-750°C. Vickers hardness and residual stress distributions were measured in order to examine the characteristics of the surface-modified layer created by the developed process. Surface microstructures were also observed using an optical microscope. As a result, the developed processes from 650-750°C created a surface with a high hardness and an extremely fine-grained microstructure. The fine-grained microstructure was created due to dynamic recrystallization. In order to clarify the effects of the IH-FPP treatment on fatigue strength of notched SCM435H steel with a stress concentration factor of K_t = 2.36, fatigue tests were performed at room temperature using a rotational bending fatigue testing machine. The specimen treated by IH-FPP process at 700°C exhibited the highest fatigue strength. This was because micro crack initiation and propagation were inhibited by the surface modified layer with high hardness and fine-grain. This result suggests that the IH-FPP treatment process is highly effective in improving the fatigue strength of steel.

Journal

• Journal of the Society of Materials Science, Japan

  Journal of the Society of Materials Science, Japan 60 (12), 1091-1096, 2011

  The Society of Materials Science, Japan

Keywords

• Fatigue
• Peening
• Hardness
• Residual stress
• Induction heating
• Dynamic recrystallization

Details

• CRID: 1390282680420271616
• NII Article ID: 130002085176
• NII Book ID: AN00096175
• DOI: 10.2472/jsms.60.1091
• ISSN: 18807488
• ISSN: 05145163
• NDL BIB ID: 023391797
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I023391797
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed