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主要研究了晶粒尺寸对Fe-17Mn-1Al-0.6CTWIP钢的氢脆行为的影响。原始材料经过不同的热处理制度,得到晶粒尺寸为17和45μm的材料。通过慢拉伸试验研究氢质量分数在0~0.001%材料的氢脆敏感性。试验结果表明,充氢后的试验材料比未充氢试验材料易发生氢脆,充氢后的试验材料断裂强度和断裂应变均降低。随着晶粒尺寸的增大,试验材料的氢脆敏感性增强。在氢质量分数为0.001%,晶粒尺寸增加到45μm时,应变损失率为17%,随着晶粒尺寸的增大,氢脆敏感性增加的原因是晶粒尺寸较大的材料孪晶较早出现,孪晶密度较大,同时单位晶界氢质量分数增加。
The effects of grain size on the hydrogen embrittlement behavior of Fe-17Mn-1Al-0.6CTWIP steel were studied. The raw materials were subjected to different heat treatment systems to obtain materials with grain sizes of 17 and 45 μm. Hydrogen embrittlement susceptibility of materials with hydrogen content of 0 ~ 0.001% was studied by slow tensile test. The experimental results show that the hydrogen embrittlement test material is more susceptible to hydrogen embrittlement than the hydrogen-free test material, and the fracture strength and fracture strain of the test material after hydrogen charging decrease. As the grain size increases, the hydrogen embrittlement sensitivity of the test material increases. When the mass fraction of hydrogen is 0.001% and the grain size is increased to 45μm, the strain loss rate is 17%. As the grain size increases, the reason for the increase of hydrogen embrittlement sensitivity is that the twin of the larger grain size Early appeared, twins density, while the unit grain boundary hydrogen mass fraction increased.