通过对35CrMo钢进行热处理来提高材料的晶粒度，采用慢应变速率拉伸（SSRT）和现代微观分析方法，在动态电化学充氢的环境下，研究了晶粒度对35CrMo钢氢脆敏感性的影响。结果表明，35CrMo钢经过850℃完全淬火15min（油冷）＋780℃亚温淬火25min（油冷）＋740℃高温回火120min（空冷）可以把品粒度细化到10．8μm，且在动态充氢电流密度为150mA／cm2时其断裂强度、伸长率以及断面收缩率分别达到569．875MPa、12．90％和38．96％，表现出很好的强塑性。可见细化晶粒是提高35CrMo钢抗氢致开裂敏感性的一种有效途径。
The grain size of 35CrMo steel was increased by heat treatment method. The influence of grain size on hydrogen embrittlement sensitivity was studied in the environment of dynamic electrochemical hydrogen charging by slow strain rate test （SSRT） technique and modern micro-analysis method. The results showed that the grain size of 35CrMo steel reached 10. 8μm by complete quenching at 850 ℃ for 15 min （oil cold）, subcritical quenching at 780 ℃ for 25 min （oil cold） and high temperature tempering at 740 ℃ for 120 min （air cooling） in order. When the current density of dynamic hydrogen charging was 150 mA/cm2 , the breaking strength, elongation and reduction in area of 35CrMo steel were 569. 875 MPa, 12. 90% and 38. 96% respectively, indicating that increasing grain size is an effective way to improve the resistance to hydrogen induced cracking of 35CrMo steel.
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