20g与P91异种金属焊接接头组织及其性能分析  

Analysis on Microstructure and Properties of 20g and P91 Dissimilar Metal Welded joints

作　　者：潘全喜[1] 王均杰[2] 陈文静[3] 薛春霞[1] 

机构地区：[1]郑州职业技术学院材料工程系,河南郑州450121 [2]郑州职业技术学院机械工程系,河南郑州450121 [3]西华大学材料科学与工程学院,四川成都610039

出　　处：《热加工工艺》2015年第15期216-218,221,共4页Hot Working Technology

摘　　要：通过对20g和P91异种金属进行埋弧自动焊试验,研究了焊接接头各区域包括母材、热影响区和焊缝的显微组织,并对焊接接头进行了硬度测试、拉伸试验和冲击试验等力学性能测试。结果表明,20g侧焊缝组织为珠光体和针状铁素体,P91侧焊缝组织是块状铁素体、珠光体以及马氏体;焊缝区的显微硬度值要明显高于两侧母材以及热影响区的显微硬度值;焊缝金属的抗拉强度要明显高于两侧母材的抗拉强度,断裂位置发生在母材20g侧;接头20g侧母材、焊缝区和P91侧母材的冲击功分别185.2、239.6和13.0 J,表明焊缝的冲击韧性明显高于两侧母材的冲击韧性,但是和焊前相比较,20g侧母材焊后冲击韧性得到大幅提高,而P91侧母材焊后冲击韧性显著降低。By taking submerged arc automatic welding tests on 20 g and P91 dissimilar metals, the microstructure and mechanical properties of base metal, heat-affected zone and welding seam were studied. The mechanical property testing,including hardness test, tensile test and impact test was also conducted on the welded joints. The test results show that the microstructure of the side of 20 g welding seam is pearlite and acicular ferrite. The microstructure of the side of P91 welding seam is massive ferrite, pearlite and martensite; the microhardness of the welding seam is much higher than that of the base metals and heat-affected zone. The tensile strength of the welding seam metal is much higher than that of the base metals, with fracture occuring in the side of 20 g base metal. The impact energies of the side of 20 g base metal, welding seam metal and the side of P91 base metal are 185.2J, 239.6 J and 13 J respectively. The results show that the impact toughness of welding seam is higher than that of the base metals. However, compared with base metals without being welded, the impact toughness of the side of 20 g base metal is greatly improved, while the impact toughness of the side of P91 base metal decreases significantly.

关 键 词：埋弧焊 异种金属 显微组织 力学性能 

分 类 号：TG455[金属学及工艺—焊接] TG457.11