尝试利用小锥度试样测量304不锈钢应力腐蚀裂纹的形核时间,以确定裂纹形核在整个断裂过程中的贡献.结果表明,用小锥度试样可以有效测量应力腐蚀裂纹的形核时间.对304不锈钢,在沸腾MgCl2溶液中应力腐蚀裂纹的形核时间与应力之间满足ti=4310exp(-0.0097σ),而断裂时间与应力的关系为tf=6964exp(-0.0095σ),说明应力腐蚀断裂时间的大部分来源于裂纹的形核过程.断口形貌与外加应力有关,随外加应力增大,断口的穿晶解理部分减少. Attempts to measure the nucleation time of stress corrosion cracking of 304 stainless steel with a small taper sample to determine the contribution of crack nucleation during the entire fracture process show that the small taper sample can effectively measure the nucleation time of stress corrosion cracking, 304 stainless steel, in the boiling MgCl2 solution stress corrosion cracking between the nucleation time and stress to meet ti = 4310exp (-0.0097σ), and the relationship between the fracture time and stress tf = 6964exp (-0.0095σ), indicating stress corrosion cracking Most of the time comes from the nucleation process of the crack.The fracture morphology is related to the applied stress, with the increase of the applied stress, the transcrystallization cleavage part of the fracture decreases.