摘要:
通过在气保护药芯焊丝的药粉中直接添加不同量的钛铁,在富氩和CO2保护气焊接条件下,将钛过渡到熔敷金属中,分析钛对熔敷金属组织韧性的影响.结果表明,运用Si-Mn-Ti联合脱氧的药芯焊丝,熔敷金属中生成的夹杂物主要是MnO-TiOx-Al2O3-SiO2形成的复合氧化物.随着焊丝中钛含量的增加,所形成的夹杂物中Ti元素的含量增加,且夹杂物的尺寸更加集中在0.3~2.0μm的范围,对熔敷金属中生成针状铁素体组织的促进作用增强,熔敷金属韧性得到改善;同时,进入熔敷金属组织中的固溶钛,提高了组织的强度和硬度,但过多的固溶钛则恶化组织的韧性.
Abstract:
The effects of Ti content on microstructure characteristic of deposited metal with flux cored wire were investigated with different contents of Ti-Fe powder under the protection of CO2 and Ar+20%CO2.The results show that the inclusions in deposited metal are mainly complex oxides composed of MnO-TiOx-Al2O3-SiO2 in Si-Mn-Ti deoxidized flux cored wire.With the increasing of Ti content in flux cored wire, the content of Ti in the inclusions increases, and most of inclusions are in the range of 0.3~2.0 μm in diameter, which promote the formation of acicular ferrite, thus those contribute to the increased toughness of deposited metal.Dissociative Ti can improve the intensity and the rigidity of microstructure, but it does worse to the microstructure toughness when too much dissociative Ti gets into the microstructure of deposited metal.
点击查看大图
下载:
