氢对2.25Cr-1Mo钢回火脆化的影响  

Effect of Hydrogen on Temper Embrittlement of 2.25Cr-1Mo Steel

作　　者：刘涛[1] 张喜亮[1] 卢宝城 周昌玉[3] 

机构地区：[1]河北工程大学装备制造学院,邯郸056038 [2]河北钢铁集团邯钢公司能源中心,邯郸056015 [3]南京工业大学机械与动力工程学院,南京210009

出　　处：《机械工程材料》2013年第9期49-53,63,共6页Materials For Mechanical Engineering

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.

关 键 词：俄歇电子能谱 回火脆化 2 25Cr-1Mo钢 氢脆 晶界偏聚 

分 类 号：TG14[一般工业技术—材料科学与工程] TG113[金属学及工艺—金属材料]