微合金管线钢焊接粗晶热影响区及焊缝的第二相粒子分析  

Research on Second Phase Particles in CGHAZ and Weld of Micro Alloyed Pipeline Steel

作　　者：耿相军[1] 陈茂爱[2] 

机构地区：[1]山东交通学院工程机械系,山东济南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,山东济南250014

出　　处：《热加工工艺》2009年第3期5-9,共5页Hot Working Technology

基　　金：山东省科学技术发展计划资助项目(2006GG3204017)

摘　　要：利用萃取技术,对微合金管线钢焊接粗晶热影响区及焊缝的第二相粒子进行了分析。结果表明,在焊接过程中,母材中的碳氮化合物粒子绝大部分发生溶解,溶解到溶池中的Ti通过冶金反应生成TiO,TiO与溶池中的其他脱氧(脱硫)产物结合成尺寸较大的夹杂物;而溶解到溶池中的Nb及V未重新析出。分析表明,TiO位于夹杂物的表面,且其附近一般有MnAl2O4相,两者具有相同晶体位向。焊接热循环后,焊接粗晶区中仍有较多的碳氮化合物粒子,但粒子尺寸显著增大,粒子的形状由母材中的不规则状变为方形,粒子的含Ti显著提高。By using carbon extraction replica technology, the second phase particles in CGHAZ and weld of micro alloyed pipeline steel was researched. The results show that the most of carbonitride particles in welding pool dissolves, Ti dissolved in the molten pool takes part in de-oxidation reaction producing TiO phase, TiO is combined with the other defoliation or desulfuration production to form large inclusion, Nb and V dissolved in the molten pool does not re-precipitated. It is found that the TiO and MnAI204 formes at the surface of inclusions, TiO lattice has the same direction with MnAl2O4. One part a large quantity of carbon nitride particles survive in the simulated welding cycle, the other part the shape of remaining particles change from irregular shape to squareness one, the mean particle size increases largely, all the particle in CGHAZ is rich in Ti.

关 键 词：微合金钢 第二相粒子 焊接热循环 焊缝 粗晶热影响区 

分 类 号：TG142.31[一般工业技术—材料科学与工程] TG401[金属学及工艺—金属材料]