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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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高强钢中氢致附加拉应力的定量研究
, PP. 849-852
Keywords: 高强钢,氢致附加应力
Abstract:
将40CrMoTi钢拉伸试样空拉至塑性变形大于1%后卸载,充氢至饱和后再空拉,其屈服应力小于卸载前的流变应力,其差值就是固溶氢引起的附加拉应力,它协助外应力促进塑性变形.将不同强度级别(σys=900-1400MPa)的40CrMoTi钢在pH值为4的NaCl溶液中浸泡或电解充氢,以研究氢致附加拉应力与氢浓度及材料强度的依赖关系.结果表明,浸泡后,氢致附加拉应力随强度升高而线性升高,即σad=0.14σys-106.6.氢致附加拉应力随氢浓度的对数而线性升高,即σad=-55.5+63.6.lnC0(σys=900MPa),σad=-23.5+64.2lnC0(σys=1050MPa).综合为σad=-260+0.226σys+63.9lnC0.
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