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一引言关于低合金高强度钢在硫化氢介质中的滞后断裂现象,其产生的原因,人们持有不同的观点.有人认为这类现象属氢致断裂;也有人认为主要是应力腐蚀破裂.按照氢致断裂机制的理论,金属在硫化氢介质中,由于阴极还原反应的存在,氢原子在金属表面释放、吸附、向材料内部溶解及输送,当材料中某些潜在的裂纹位置上含氢量达到临界浓度时,出现裂纹的核生.又由于在硫化氢介质作用的同时,材料中有拉伸应力存在,加速了裂纹的扩展. 为了满足石油钻采工作的需要,近年来我们曾就几种国产低合金高强度钢如何控制硫化氢滞后破裂的问题作了若干探讨.我们应用氢致断裂理论,除了就
I. INTRODUCTION Some people hold different viewpoints about the reason of the delayed fracture of low-alloy high-strength steel in hydrogen sulfide medium. Some people think that this kind of phenomenon is hydrogen-induced fracture, while others think it is mainly stress corrosion cracking. Hydrogen induced fracture mechanism of the theory, the metal in the hydrogen sulfide medium, due to the existence of the cathode reduction reaction, the hydrogen atoms in the metal surface release, adsorption, dissolution and delivery to the material inside, when the potential of some hydrogen crack location When the critical concentration is reached, nucleation of cracks occurs, and due to the tensile stress existing in the material, the crack propagation is accelerated due to the action of the hydrogen sulphide medium. In order to meet the needs of oil drilling work, in recent years, Several domestic low-alloy high-strength steel how to control the problem of delayed hydrogen sulfide rupture made a number of discussions. We apply hydrogen induced fracture theory, in addition to