稀土氧化钇对高强度钢焊条熔敷金属组织和性能影响  

Effect of yttrium oxide on microstructure and mechanical properties of in high strength steel weld metal

作　　者：刘仁培[1] 蔡养川[1] 魏艳红[1] 成中庚[1] 

机构地区：[1]南京航空航天大学材料科学与技术学院,南京211106

出　　处：《焊接学报》2015年第4期92-96,118,共6页Transactions of The China Welding Institution

摘　　要：基于Ni-Cr-Mo-V合金体系,研究了稀土氧化钇对800 MPa高强度钢焊条焊缝微观组织和性能的影响.结果表明,Y2O3含量在0~0.02%范围内变化时,随着Y2O3含量的增加,焊缝熔敷金属组织中先共析铁素体逐渐降低,针状铁素体含量逐渐增加,强度和低温冲击韧性均逐渐增加,且当Y2O3含量为0.02%时,焊缝熔敷金属低温冲击韧性达到最大值;当Y2O3含量超过0.02%时,焊缝熔敷金属组织中针状铁素体含量下降,低温冲击韧性降低.综合考虑上述因素,该高强度钢焊条中Y2O3最佳添加量为0.02%左右.Based on Ni-Cr-Mo-V alloy system,the effect of yttrium oxide on microstructure and mechanical properties of weld made with 800 MPa high strength steel electrode was investigated. Experimental results show that,as the Y2O3 content changed in 0 ~ 0. 02%,with the increase of Y2O3 content,the proeutectoid ferrite content reduced,the acicular ferrite content increased,and the strength and low-temperature impact toughness increased gradually. When the Y2O3 content was 0. 02%,the low-temperature impact toughness of weld metal reached the maximum. When the Y2O3 content was over 0. 02%,the acicular ferrite content in the weld reduced,and the low-temperature impact toughness decreased. Therefore,the optimum Y2O3 content for high strength steel electrode is about 0. 02%.

关 键 词：稀土氧化钇 800MPa高强度钢焊条 针状铁素体 低温冲击韧性 

分 类 号：TG422.1[金属学及工艺—焊接]