摘要
对加氢反应器用2.25Cr-1Mo钢进行了回火脆化并充氢处理;通过冲击试验机、俄歇电子能谱仪及扫描电镜等研究了2.25Cr-1Mo钢在回火脆化与氢脆联合作用下的脆化情况;结合晶界偏聚理论,计算了在不同回火及充氢处理后杂质磷原子在晶界上的偏聚量。结果表明:试验钢的脆化程度不能用显微组织、硬度的变化来评价;在回火温度范围内,随着回火时间的延长,试验钢回火脆化的程度逐渐增大,氢进一步增加了其脆化程度,并且回火脆化与氢脆联合作用下的脆化程度要远大于回火脆化的;氢增大了试验钢中杂质原子磷的扩散系数,进而促进磷原子向晶界偏聚,这是充氢加重回火脆化的主要原因。
Tempering and hydrogen charging were carried on a 2. 25C1Mo steel used for hydrogenation reaction, and then to study the effect of hydrogen embrittlernent and temper embrittlement on embrittlement properties of the steel by impact testing, Auger electron spectrometer testing and scanning electron microscopy testing. Basing on grain boundary segregation theory, the amount of P atom segeration at grain boundaries was calculated after different tempering and hydrogen charging treatments. The results show that the microstructure and hardness could not be used to assess the embrittlement degree of the tested steel. With the increase of tempering time during tempering temperature range, the temper embrittlement gradually increased, and hydrogen charging enlarged embrittlement degree. The effect of combined effects of hydrogen embrittlement and temper embrittlement on embrittlement degree was much more than that of temper embrittlement alone. Hydrogen charging amplified diffusion coefficient of P atom, and thus aggravated element P segeration at grain boundaries, and this was the main reason of hydrogen charging aggravating temper embrittlement.
出处
《机械工程材料》
CAS
CSCD
北大核心
2013年第9期49-53,63,共6页
Materials For Mechanical Engineering
关键词
俄歇电子能谱
回火脆化
2
25Cr-1Mo钢
氢脆
晶界偏聚
Auger electron spectrum
temper embrittlement
2. 25Cr-1Mo steel
hydrogen embrittlement
grain boundary segregation
