【摘要】 对于 9Cr- 1Mo耐热钢 ,碳化物的类型和分布是维持材料高温力学性能的关键。对于瑞典ESAB公司的三类 9Cr- 1Mo焊条制成的焊缝金属 ,通过研究发现 ,经过 710℃或 74 0℃× 5h的高温回火处理以后 ,三类材料的力学性能变化发生了较大的差异 ,为此用电子显微镜和光学显微镜对材料的微观组织进行了观察。根据微观观察和成分分析的结果发现 ,高温回火热处理后 ,Cr2 3C6 和Cr7C3型碳化物沿晶界和马氏体板条界面以链状或粒状析出长大 ,材料的力学性能因此发生变化 ,同时还发现 ,铌和钒所产生的耐高温碳化物对保持焊缝组织的高温稳定性有重要影响 ,焊条中适当降低碳含量并不会对焊缝的组织和性能产生负面影响更多还原

【Abstract】 Mechanical property test,TEM and optical microscope were carried out on the the deposited metals of three 9Cr 1Mo electrodes,provided by the ESAB Company in Sweden,to have a better understanding of their high temperature performance after the tempering of 710℃ or 740℃ for 5 hour.The as tempered weld metals show distribution of Cr carbides,such as Cr 23 C 6and Cr 7C 3,precipating along the grain or martensite phase boundary.A comparison of the chemical content of the weld metals indicates that the contents of V and Nb are responsible for the better performance to keep the high temperature when the weld metals were served under high temperature for a long time.更多还原