Al对金红石型药芯焊丝熔敷金属组织性能的影响  

Influence of Al on Microstructure and Mechanical Properties of Weld Metal Deposited with Rutile-type Flux Cored Wire

作　　者：朱官朋 郭纯[1] 姚润钢[1] 

机构地区：[1]中国船舶重工集团公司第七二五研究所,河南洛阳471023

出　　处：《热加工工艺》2015年第21期24-27,共4页Hot Working Technology

基　　金：高技术船舶项目(MK142201)

摘　　要：通过在金红石型药芯焊丝中加入不同含量的铝铁,研究了Al对熔敷金属组织及力学性能的影响,并对夹杂物的数量和成分进行了分析。随着焊丝中铝铁含量的增加,Al对促进其他脱氧元素过渡的作用不明显,熔敷金属强度基本保持不变,韧性变化显著。微观组织及夹杂物分析发现,当Al以合金元素的形式固溶于基体中时,促进晶界块状铁素体的析出,使韧性恶化;当Al以脱氧剂的作用与Ti、Mn等元素联合脱氧时,可以优化夹杂物尺寸,增大原奥氏体晶粒尺寸,促进针状铁素体的形核,使熔敷金属获得良好的韧性。With different amounts of ferro-aluminium in the rutile-type flux cored wires, the influence of Al content on the microstructure and mechanical properties was studied and the inclusions were analyzed. The results show that Al has a slight effect on promoting the transfer of the alloying elements like Si and Mn to the weld metal with the addition of aluminuim. The strength of the deposited metal almost keeps constant, while the impact energy is significantly influenced by the aluminuim content. The microstructure and nonmetallic inclusion analysis show that excellent toughness can be obtained when Al acts as a deoxidizer combining with other elements which can promote the nucleation of acicular ferrite by optimizing the inclusion size and increasing the prior austenite grain size, whereas, the toughness would be deteriorated when Al dissolves as alloying element which results in the precipitation of polygonal ferrite at prior austenite grain boundaries.

关 键 词：铝 熔敷金属 力学性能 夹杂物 

分 类 号：TG422.3[金属学及工艺—焊接]