2.25Cr-1Mo-0.25V钢焊缝阶冷脆化研究  

Experimental Study on Welded Metal of 2.25Cr-1Mo-0.25V Steel by Step-cooling Heat Treatment

作　　者：宋立平[1] 孙荣禄[1] 

机构地区：[1]天津工业大学,天津300387

出　　处：《热加工工艺》2014年第5期31-33,37,共4页Hot Working Technology

摘　　要：2.25Cr-1Mo-0.25V钢是加氢反应器常用材料,本文对其用同一型号不同批次的焊条焊接的焊缝进行焊后热处理和焊后热处理阶冷处理后,测定不同温度下的冲击功,发现焊缝抗回火的能力明显不同。焊缝能满足性能要求,焊后热处理后冲击功54 J的温度不高于-60℃,焊后热处理阶冷后冲击功54 J的温度不高于-40℃。冲击功较低的焊缝为沿晶断裂,脆断断口表面为杂质元素P和Mo的碳化物及氧化物。Abstraet：2.25Cr-1Mo-0.25V steel was used for hydrogenation reactor. The temper embrittlement was evaluated as the shift of 54 Joule transition temperature（vTr54） by Charpy v-notch impact test. A series of 2.25Cr-lMo-0.25V steel welds were prepared using manual arc. The weld metals were analyzed in the post weld heat treatment （PWHT） and PWHT followed by step-cooling （SC） heat treatment condition. The weld metals were measured by welding rod of the same trademark but different batch have distinct different tendency of brittleness. In the post-weld heat-treated （PWHT）, the notch touglmess required for weld metal is 54 J which is not more than -60~C, PWHT condition followed by step-cooling （SC）, 54J is not more than -40~C. The results show that the low impact welding seam may relate to content of Mn. the reason for temper brittleness is that the content of phosphorus and carbonization segregation on the grain boundary. The impact toughness of the samples corresponding to intergranular fracture is lower. The reason for temper brittleness is that the carbide and oxide of phosphorus, manganese and molybdenum segregation on the grain boundary. Key words： 2.25Cr- 1Mo-0.25V; step-cooling; temper brittleness

关 键 词：2 25Cr-1Mo-0 25V钢 阶冷 回火脆性 

分 类 号：TG157[金属学及工艺—热处理]