超高强钢典型环境下扩散氢演变及延迟开裂行为研究

Study on the diffusion hydrogen of ultra-high strength steel in typical environments

利用干湿循环试验与随车挂片试验方法研究了6种超高强钢在典型环境下扩散氢变化规律及延迟开裂行为,并分析了环境对超高强钢延迟开裂行为影响。结果表明:试验钢种在模拟服役环境下,除预变形11.3%的B-1钢在模拟服役环境下扩散氢含量更高外,其他样品扩散氢含量极低。实际服役环境下6种超高强钢均没有发生延迟开裂,表面完好,且实际服役环境下超高强钢扩散氢含量高于模拟服役环境。

The variation law of hydrogen diffusion and delayed cracking behavior of six kinds of ultra-high strength steels under a typical environment were studied by dry wet cycle test and on-vehicle coupon test.Besides,the influence of the environment on the delayed cracking behavior of ultra-high strength steel was also analyzed.The results show that the diffusion hydrogen content of the test steel is very low in the simulated service environment,except that the pre-deformed 11.3%B-1 steel has a higher diffused hydrogen content in the simulated service environment.There was no crack on the surface of the ultra-high strength steel after the test in the actual service environment.In addition,the diffusion hydrogen content of ultra-high strength steel in the actual service environment is higher than that in the simulated service environment.