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1. (WO2018066666) NITRIDED COMPONENT AND METHOD FOR PRODUCING SAME

Pub. No.:    WO/2018/066666    International Application No.:    PCT/JP2017/036373
Publication Date: Fri Apr 13 01:59:59 CEST 2018 International Filing Date: Fri Oct 06 01:59:59 CEST 2017
IPC: C23C 8/26
C21D 1/06
C22C 38/00
C22C 38/60
C21D 1/76
C21D 9/30
C21D 9/32
Applicants: NIPPON STEEL & SUMITOMO METAL CORPORATION
新日鐵住金株式会社
Inventors: UMEHARA, Takahide
梅原 崇秀
YUYA, Masato
祐谷 将人
Title: NITRIDED COMPONENT AND METHOD FOR PRODUCING SAME
Abstract:
This nitrided component exhibits excellent rotating bending fatigue strength in addition to surface fatigue strength, and is characterized in that: a steel material having a prescribed chemical composition is used as the material therefor; a compound layer which contains iron, nitrogen and carbon and has a thickness no less than 3μm and less than 20μm is formed on the surface of the steel material; the phase structure of the compound layer in the range from the surface to a depth of 5μm contains a γ' phase in an amount equal to or greater than 50% by area ratio; the void area ratio in the range from the surface to a depth of 3μm is less than 1%; and the compressive residual stress at the compound layer surface is 500MPa or more.