Fatigue properties of pre-FPP (Fine Particle Peening) treated and gas Nitrided austenitic stainless steel

S. Kikuchi, Y. Nakahara, J. Komotori

研究成果: Conference contribution

抄録

The nitrided layer is extremely thin due to the existence of a passive film at the surface of austenitic stainless steel. In order to accelerate the diffusion of nitrogen into the material, a fine particle peening (FPP) treatment was introduced prior to gas nitriding (pre-FPP treatment). The effects of pre-FPP treatment on gas nitriding behavior and fatigue properties of AISI 316 steel were evaluated. Surface microstructures of the pre-FPP treated specimens were characterized using a micro-Vickers hardness tester, scanning electron microscope (SEM), optical microscope, electron probe micro analyzer (EPMA) and X-ray diffraction (XRD). The pre-FPP treatment generated the local stratification pattern which has high dislocation densities. Therefore, nitrogen diffused into this unique structure, resulting in an increase of the surface hardness. Fatigue tests were conducted at room temperature using a rotational bending fatigue testing machine. The pre-FPP treated specimen showed the highest fatigue strength. After fatigue tests, fracture surfaces were observed using an SEM in order to investigate the high cycle fatigue properties.

本文言語English
ホスト出版物のタイトルMaterials Science and Technology Conference and Exhibition MS and T'08
ページ741-752
ページ数12
出版ステータスPublished - 2008 12 1
イベントMaterials Science and Technology Conference and Exhibition, MS and T'08 - Pittsburgh, PA, United States
継続期間: 2008 10 52008 10 9

出版物シリーズ

名前Materials Science and Technology Conference and Exhibition, MS and T'08
2

Other

OtherMaterials Science and Technology Conference and Exhibition, MS and T'08
CountryUnited States
CityPittsburgh, PA
Period08/10/508/10/9

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials

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