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Production method null of the resistance abrasive high Cr cast iron and the abrasion proof component and the said component which are superior in resistance fatigue crack development
Production method null of the resistance abrasive high Cr cast iron and the abrasion proof component and the said component which are superior in resistance fatigue crack development
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机译:高耐磨性高Cr铸铁的制造方法,耐疲劳裂纹发展优异的耐磨成分及上述成分
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摘要
PROBLEM TO BE SOLVED: To reduce the tensile stress causing the propagation of fatigue cracks in high Cr cast iron and to prevent cracks therein by regulating the ratio of the content of Cr to the content of C and the product of the content of Mn and the content of Mo in high Cr cast iron contg. C, Mn, Cr and Mo to specified ranges. ;SOLUTION: In high Cr cast iron contg. C, Mn, Cr and Mo, the inequality of 5.0≤[Cr]/[C]≤7.2 ([Cr] and [C] denote each content) and the inequality of 1.8≤[Mn].[Mo]≤2.5 ([Mn] and [Mo] denote each content) are satisfied. The maximum value of the Vickers hardness obtd. at the inside of ≥20 mm from the surface of the member is higher than the Vickers hardness on the surface of the member other than a decarburized layer by ≥20. Moreover, at the time of the production, when quenching is executed from 850 to 1020°C quenching temp., the cooling rate at the inside of ≥20 mm from the surface of the member is regulated to ≤0.5°C/sec to precipitate carbides, by which the Ms point at the inside is increased, and the tensile residual stress in the surface of the member after the completion of heat treatment is reduced.;COPYRIGHT: (C)1999,JPO
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