当前位置: X-MOL 学术J. Mater. Process. Tech. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Arc weldability of Incoloy 825 to AISI 321 stainless steel welds
Journal of Materials Processing Technology ( IF 6.3 ) Pub Date : 2018-12-01 , DOI: 10.1016/j.jmatprotec.2018.07.020
Navid Sayyar , Morteza Shamanian , Behzad Niroumand

Abstract Composition effect of Inconel 625, Incoloy 65 and ER347 fillers on microstructural evolution and solidification crack (SC) sensitivity of gas tungsten arc welded Incoloy 825 to AISI 321 SS was investigated. The structure of welds had been mostly austenitic, and solute segregation caused formation of eutectic-nature secondary phases in inter-dendritic/cellular spaces of three weld alloys. The dilution effect led to a transition from FA to AF mode of solidification in ER347 weld and decreased its ferrite content. Inconel 625 and ER347 welds had the highest and lowest resistance to SC during Longitudinal Varestraint Test, respectively. Fine dendritic structure of Inconel 625 weld resulted in easier strain accommodation and better weldability properties of this alloy. Severe cracking and high sensitivity of ER347 weld to SC were characterized because of low ferrite content and easier wettability of solidification grain boundaries due to formation of low-melting Nb and Ti-rich phases. Inconel 625 filler could play an effective role in establishing an appropriate bridge in terms of thermal expansion coefficient between dissimilar parent metals.

中文翻译:

Incoloy 825 与 AISI 321 不锈钢焊缝的电弧焊性

摘要 研究了Inconel 625、Incoloy 65 和ER347 填料对Incoloy 825 与AISI 321 SS 钨极气体保护焊的显微组织演变和凝固裂纹(SC) 敏感性的影响。焊缝的组织主要是奥氏体,溶质偏析导致在三种焊接合金的枝晶间/细胞空间中形成共晶性质的第二相。稀释效应导致 ER347 焊缝从 FA 凝固模式转变为 AF 凝固模式并降低其铁素体含量。Inconel 625 和 ER347 焊缝在纵向 Varestraint 测试中分别具有最高和最低的 SC 电阻。Inconel 625 焊缝的细枝晶结构导致该合金更容易应变调节和更好的可焊性。ER347 焊缝的严重开裂和对 SC 的高敏感性的特征是铁素体含量低,并且由于形成低熔点 Nb 和 Ti 富集相,凝固晶界更容易润湿。Inconel 625 填料可以有效地在不同母金属之间建立适当的热膨胀系数桥接。
更新日期:2018-12-01
down
wechat
bug