高強度鋼における高疲労強度の評価法と製造方法

Japanese Patent JP4360509

B2

The present invention provides a method of designing a high fatigue strength material in high tensile strength steel, comprising the steps of: obtaining the values of tensile strength sigma B (unit thereof is MPa) and Vickers hardness Hv of the steel; measuring the flaw area of inclusion, when the fracture origin is located only at the surface of the steel; and estimating, in designing the high fatigue strength material, that the fatigue limit sigma w (unit thereof is MPa) of the steel satisfies either sigma W ≥ 0.5 sigma B or sigma W ≥ 1.6Hv, when a square root of the flaw area, (area)<1/2> (unit thereof is m), contained in the steel is no larger than 45.8/ sigma B<2> or 4.47/Hv<2>. According to the present invention, a method of evaluating high fatigue strength material in high tensile strength steel, in which method the relationship between the flaw dimension (area) of ODA and the fatigue strength is considered, as well as a high fatigue strength material, can be provided.

WO/2007/036063	METHOD AND DEVICE FOR IDENTIFYING AND MONITORING A MEDICAL INSTRUMENT
JPH0628707	[Name of invention] Repeated stress corrosion cracking monitoring device

Tatsuaki Sawai
Matsuoka Saburo
Takayuki Abe
Takeo Etsuo
Kensuke Miyahara
Ebikawa Hisashi
Tsuzaki Kaneaki
Kimura Yuji

JP2000232531A

November 11, 2009

July 31, 2000

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National Institute for Materials Science
Kawasaki Heavy Industries, Ltd.

G01N3/32; B21C51/00; C21D1/18; C22C38/00; G01N33/20

JP11158578A
JP2000144306A
JP2000034542A
JP7286231A
JP11194121A
JP2000144311A
JP2000144243A
JP2000063986A
JP11193855A
JP11190408A

小笠原幸治 他,”高硬度微粒子の高速衝突を利用した表面創製処理鋼の疲労強度特性”,社団法人日本材料学会 第47期 学術講演会講演論文集,1998年 5月21日,201~202頁

Toshio Nishizawa

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