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Title:
高強度鋼における高疲労強度の評価法と製造方法
Document Type and Number:
Japanese Patent JP4360509
Kind Code:
B2
Abstract:
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.

Inventors:
Tatsuaki Sawai
Matsuoka Saburo
Takayuki Abe
Takeo Etsuo
Kensuke Miyahara
Ebikawa Hisashi
Tsuzaki Kaneaki
Kimura Yuji
Application Number:
JP2000232531A
Publication Date:
November 11, 2009
Filing Date:
July 31, 2000
Export Citation:
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Assignee:
National Institute for Materials Science
Magaldi Industrie s.r.l
International Classes:
G01N3/32; B21C51/00; C21D1/18; C22C38/00; G01N33/20
Domestic Patent References:
JP11158578A
JP2000144306A
JP2000034542A
JP7286231A
JP11194121A
JP2000144311A
JP2000144243A
JP2000063986A
JP11193855A
JP11190408A
Foreign References:
Attorney, Agent or Firm:
Toshio Nishizawa