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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=-55.5十63.6lnC0（σys=900 MPa）,σad=-23.5+64.2ln C0（σys=1050 MPa）.综合为:σad=260+0.226σys+63.9ln C0.
The 40CrMoTi steel tensile specimens were drawn to plastic deformation of more than 1% after unloading, hydrogen charging to saturation after emptying, the yield stress is less than the flow stress before unloading, the difference is the additional tensile stress caused by solid solution hydrogen , Which assists the external stress to promote the plastic deformation.The 40CrMoTi steels with different strength levels (σys = 900-1400MPa) were immersed in or infiltrated with hydrogen in pH 4 NaCl solution to study the hydrogen-induced additional tensile stress and hydrogen concentration and the material The results of the dependence of the intensity show that after immersion, the hydrogen induced tensile stress increases linearly with the increase of the strength, that is σad = 0.14σys-106.6 The hydrogen induced tensile stress increases linearly with the logarithm of hydrogen concentration, that is σad = -55.5 X 63.6lnC0 (σys = 900 MPa), σad = -23.5 + 64.2ln C0 (σys = 1050 MPa). The synthesis is: σad = 260 + 0.226σys + 63.9ln C0.