Analysis of laser beam weldability of Inconel 738 superalloy
Analysis of laser beam weldability of Inconel 738 superalloy
复制标题
DOI：
10.1016/j.matchar.2010.02.016
复制
发表时间：
2010-05
影响因子：
4.7
通讯作者：
A. Egbewande;R. Buckson;O. Ojo
中科院分区：
文献类型：
--
作者：
A. Egbewande;R. Buckson;O. Ojo
研究了焊前热处理激光束焊接 IN 738 高温合金对热影响区 (HAZ) 裂纹的敏感性。与晶间液化较多的焊前热处理相比，产生最小晶界液化的焊前热处理会导致更高程度的裂纹。晶间液化程度对HAZ微裂纹的影响与一般预期的偏差可归因于基体合金适应焊接拉伸应力的能力降低，而焊接拉伸应力伴随着旨在最大限度地减少晶间液化的焊前热处理条件。此外，与其他镍基高温合金中普遍报道的情况相反，激光焊接速度的降低导致 IN 738 中的 HAZ 裂纹增加，这可归因于较低焊接速度下加剧的工艺不稳定。
The susceptibility of pre-weld heat treated laser beam welded IN 738 superalloy to heat affected zone (HAZ) cracking was studied. A pre-weld heat treatment that produced the minimal grain boundary liquation resulted in a higher level of cracking compared to those with more intergranular liquation. This deviation from the general expectation of influence of intergranular liquation extent on HAZ microfissuring is attributable to the reduction in the ability of the base alloy to accommodate welding tensile stress that accompanied a pre-weld heat treatment condition designed to minimize intergranular liquation. Furthermore, in contrast to what has been generally reported in other nickel-based superalloys, a decrease in laser welding speed resulted in increased HAZ cracking in the IN 738, which can be attributed to exacerbated process instability at lower welding speeds.