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钢铁材料的回火脆和氢脆都是引入注目的问题。分别加以研究的文献相当多,得到的规律及其解释也不尽一致。本文对40Cr 钢淬火后在回火脆温度范围内回火的试样进行阴极电解充氢,研究其断裂韧性的变化规律。1 试验过程试验用材料为工业用40Cr 钢,其实测化学成分(wt%)为:C0.41,Si 0.30,Mn 0.64,Cr 0.96,S0.010,P 0.022,Ni 0.18,Cu 0.11,试样粗加工后在850℃盐浴炉加热后油冷。200～450℃回火后水冷。三点弯曲试验采用 COD 试样,尺寸为10mm×20mm×80mm。试样用线切割机开口后在高频疲劳机上预制
The temper embrittlement and hydrogen embrittlement of steel materials are all attractive issues. There are quite a number of articles studied separately, and the laws and explanations obtained are not consistent. In this paper, 40Cr steel quenched in the tempering temperature range of the sample after cathodic electrolysis of hydrogen filling, the change of fracture toughness. 1 Test Process The test material for industrial 40Cr steel, the measured chemical composition (wt%): C0.41, Si 0.30, Mn 0.64, Cr 0.96, S0.010, P 0.022, Ni 0.18, Cu 0.11, the sample After roughing in 850 ℃ salt bath heating oil cooling. 200 ~ 450 ℃ after tempering water. Three-point bending test using COD samples, the size of 10mm × 20mm × 80mm. The sample was cut by a wire cutter and prefabricated in a high-frequency fatigue machine