基于4130X材料的高压氢脆评价方法研究

High⁃pressure Hydrogen Embrittlement Evaluation Method Research Based on 4130X Material

材料氢脆会严重影响高压氢气储、运系统的性能,随着氢能在交通、电力等领域的应用,材料氢脆及服役安全也越来越受到重视。针对4130X材料氢脆敏感度评价及材料氢脆性能评价方法问题,开展了基于圆片压力试验与断裂力学试验技术的材料高压氢脆性能评价研究,并对材料的高压氢脆评价方法展开了讨论。结果表明4130X材料的氢脆敏感度系数为1.11,恒位移加载条件下材料的氢致开裂门槛值K_(IH)为87.81MPa·m^(1/2)。在微观断口分析中研究发现氢的介入导致材料断裂呈现了准解理及沿晶断口形貌。基于上述研究,本文提出针对CrMo高强钢开展ISO 11114-4标准中氢脆性能评价时,在方法选择上可采用A、B或A、C方法组合的建议。

Hydrogen embrittlement(HE)in metals can seriously affect the performance of high⁃pressure hydrogen storage and transmit system.With the application of hydrogen energy in the fields of transportation and electric power,hydrogen embrittlement and service security have been paid more and more attention.To research the evaluation of hydrogen embrittlement sensitivity of 4130X materials and the HE evaluation methods,the disc pressure test and the fracture mechanics test were carried out,as well as the discussion of the high⁃pressure hydrogen embrittlement valuation methods.The HE sensitivity 1.11 and the K_(IH) 87.81 MPa·m^(1/2)of 4130X were obtained,respectively.It is also found that the intervention of hydrogen caused the fracture to appear quasi⁃cleavage and intergranular fracture morphology.For the HE evaluation of CrMo high⁃strength steel,the suggestion that A and B methods or A and C methods in ISO 11114⁃4 for the test method selection was bringing up based on the above research.