Ti-V-Nb微合金管线钢焊缝及热影响区中第二相粒子  

Second Phase Particles in CGHAZ and Weld of Ti-V-Nb Microalloyed Pipeline Steel

作　　者：耿相军[1] 陈茂爱[2] 

机构地区：[1]山东交通学院,济南250023 [2]山东大学材料液态结构及其遗传性教育部重点试验室,济南250014

出　　处：《特殊钢》2007年第6期13-15,共3页Special Steel

基　　金：山东省科学技术发展计划资助项目(2006GG3204017)

摘　　要：利用萃取复型技术研究了Ti-V-Nb微合金钢(%:0.08C、1.29Mn、0.02Ti、0.04V、0.04Nb)模拟粗晶热影响区及焊缝(H08C焊丝%:0.06C、1.44Mn、0.24Mo、0.04Ti、0.01V)第二相粒子。结果表明,母材大部分第二相粒子≤30nm,平均尺寸19.70nm;焊接粗晶区仍残留较多的碳氮化合物粒子,粒子平均尺寸增大至42.78nm,粒子由母材中不规则形状变为方形,粒子Ti含量显著提高。焊缝中绝大部分碳氮化合物粒子发生溶解,熔池中生成的TiO与熔池中其他脱氧和脱硫产物结合成尺寸较大的夹杂物,在焊缝中未发现含Nb、V的夹杂物和第二相粒子。The second phase particles in simulated weld （H08C weld wire- 0.06C, 1.44Mn, 0.24Mo, 0.04Ti, 0. 01V） and coarse grained heat affected zone （CGHAZ） of Ti-V-Nb microalloyed steel （0. 08C, 1.29Mn, 0. 02Ti, 0. 04V, 0. 04Nb） have been studied by using carbon extraction replica technique. Results showed that size of most second phase particles in parent metal was ≤30 nm with average size 19.70 nm; there was a lot of residual carbo-nitride particles in CGHAZ of which the average size increased to 42.78 nm, and the shape of residual particles changed from irregular morphology in parent metal to cubic in CGHAZ in which the Ti content obviously increased ; and most of carbo-nitride particles in weld dissolved, the TiO formed in bath combined with other deoxidising and desulphurizing products to form large scale inclusions and the inclusions and second particles containing Nb, V didn＇t find out in weld.

关 键 词：Ti.V.Nb微合金钢 第二相粒子 焊缝 粗晶热影响区 

分 类 号：TG401[金属学及工艺—焊接]