摘要
用慢应变速率拉伸试验研究了30CrMnSiA钢几种不同组织在阴极电解充氢后的动载氢致开裂行为。结果表明:在试验中,用试样断面收缩率的相对减少率能灵敏地反映出钢的氢脆倾向性;钢中氢对其塑性的危害主要表现在降低试样在颈缩后的局部变形能力,而对试样的均匀变形影响很小;在室温下,钢的氮致脆化率不是简单地随着应变速率的下降而增加,而是与试样基体中氢的浓度及试样的形状有关。
After hydrogenation by cathodic electrolysis, various text-ures of 30CrMnSiA steel are tested on the tensiometer for their hydrogenembrittled cracking behaviour under slow dynamic load. Test results indicate: The relative decrease in the observed ratio of contraction in the tests can reflect, with high sensitivity, the tendency of hydrogen embrittlement.The damage to the plasticity of the steel due to hydrogen inclusion manifests itself chiefly in the deteriotation of the local deformability after necking-down and has little to do with the homogeneous deformation in the steel. At room temperature, the extent of hydrogen embrittlement does not increase monotonically with the decrease in the rate of strain but is related wtoh the hydrogen content in the metal matrix and the shape of the test piece.
关键词
30CRMNSIA钢
应变速率
动载氢脆
hydrogen embrittlement
hydrogen embrittlement under dynamic load
rate of strain
low alloy, high strength steel
