摘要
用冲击试验和电化学充氢方法研究了长期服役的2.25Cr 1Mo钢的回火脆化和氢脆问题,并对试样进行了显微组织分析和断口电镜扫描。结果表明:回火脆化程度不高的母材对氢脆的影响较小,断口形貌为准解理和少量的沿晶断裂;回火脆化程度较严重的焊缝对氢脆的影响较大,断口形貌为沿晶断裂。对于母材,回火脆化与氢脆的关系为线性相加;对于焊缝,回火脆化大大加剧了氢脆的程度。
The relationship between temper embrittlement and hydrogen embrittlement of 2.25Cr-1Mo steel after long-term service was investigated by Charpy impact testing and electrochemical hydrogen charging. The microstructure and fracture surfaces of specimens were examined with optical microscopy and scan electron microscopy (SEM). The results indicate that the base metal showed little susceptibility to temper embrithement in relatively low FATT(fracture appearance transition temperature) while the weld metal showed appreciable in relatively high FATT. SEM analysis revealed that the fracture surface of the base metal mainly consisted of quasi-cleavage fracture surface, and the weld metal mainly consisted of intergranular fracture surface. The relationship between temper embrittlement and hydrogen embrittlement interacted additively for base metal and synergistically for weld metal.
出处
《机械工程材料》
CAS
CSCD
北大核心
2004年第2期17-20,30,共5页
Materials For Mechanical Engineering
关键词
CRMO钢
回火脆化
氢脆
Cr-Mo steel
temper embrittlement
hydrogen embrittlement
