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利用不同形变温度同速度,以及不同氢含量,我们研究了鞍钢产AP_1重轨钢的可逆氢脆机制。初步认为可逆氢脆的产生只有在一定形变温度,一定形变速度下位错的运动能成为运输氢原子的有效工具时,将足够数量的氢原子运到试样中的力学不稳定区后,AP_1重轨钢中此不稳定区可能是晶界,也可能是相界,并当此区中氢的浓度达到产生沉淀时便出现氢脆裂纹等,最后导致氢脆断裂。根据本文实验结果指出,只要拉伸应变率等于或小于2×10~(-5)/秒,AP_1重轨钢就会出现可逆氢脆,氢脆的敏感温度范围约在50℃到100℃之间。
Using different deformation temperature and velocity, and different hydrogen content, we studied the reversible hydrogen embrittlement mechanism of AP_1 heavy rail steel produced by Anshan Iron and Steel Company. It is preliminarily believed that reversible hydrogen embrittlement occurs only when the movement of dislocation can be an effective tool to transport hydrogen atoms at a certain deformation temperature and deformation speed. After a sufficient number of hydrogen atoms are transported to the mechanically unstable zone in the sample, AP_1 In the rail steel, this unstable region may be a grain boundary or a phase boundary, and hydrogen embrittlement cracks and the like occur when the concentration of hydrogen in the zone reaches precipitation, resulting in a hydrogen embrittlement fracture. According to the experimental results in this paper, reversible hydrogen embrittlement occurs in AP_1 heavy rail steels as long as the tensile strain rate is equal to or less than 2 × 10 -5 / sec. The sensitivity temperature of hydrogen embrittlement is about 50 ℃ to 100 ℃ between.