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通过动态充氢恒载荷、氢渗透等实验研究轧制工艺对铌合金化热成型钢的氢致延迟开裂性能的影响.随着开轧温度从1000℃降低到950℃,热成型钢的氢扩散系数降低,氢致延迟开裂性能提高,耐腐蚀性能下降.透射电镜观察发现开轧温度为1000℃时MX型析出相尺寸为30 nm;开轧温度为950℃时热成型钢的MX型析出相尺寸为5 nm左右,可以观察到直径为50 nm Cr2C3析出相.作为氢陷阱的纳米析出相是提高实验钢氢致延迟开裂性能的主要因素.析出相不同的原因是开轧温度为1000℃时MX型析出相发生熟化现象,进一步抑制Cr2C3的析出.
The effect of rolling process on the hydrogen induced delayed cracking of niobium alloyed thermoformed steel was investigated by dynamic hydrogen charging and hydrogen permeation experiments. With the reduction of the open-rolling temperature from 1000 ℃ to 950 ℃, the hydrogen diffusion The coefficient is decreased, the hydrogen induced delayed cracking performance is improved, and the corrosion resistance is decreased. The transmission electron microscope shows that the size of MX precipitates is 30 nm at the open-rolling temperature of 1000 ℃ and the MX precipitates of the hot-formed steel at 950 ℃ The size of about 5 nm, can be observed in the diameter of 50 nm Cr2C3 precipitation phase as a hydrogen trap nano-precipitated phase is to improve the delayed cracking resistance of hydrogen steel delayed cracking performance of the main reason for the precipitation phase is the opening temperature is 1000 ℃ The precipitation of MX-type precipitates and further inhibits the precipitation of Cr2C3.