The liquation cracking behavior of IN738LC superalloy during low power Nd:YAG pulsed laser welding

被引：121
作者：
Montazeri, M. [1 ]
Ghaini, F. M. [1 ]
机构：
[1] Tarbiat Modares Univ, Dept Mat Engn, Tehran, Iran
来源：
MATERIALS CHARACTERIZATION | 2012年 / 67卷
关键词：
Nickel-based superalloy; Laser beam welding; Liquation cracking; HEAT-AFFECTED ZONE; LIQUID-FILM MIGRATION; GAMMA-PRIME; CONSTITUTIONAL LIQUATION; DICTRA SIMULATION; HAZ CRACKING; THERMO-CALC; MICROSTRUCTURE; DISSOLUTION; PARTICLES;
D O I：
10.1016/j.matchar.2012.02.019
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The liquation cracking behavior of low power pulsed Nd:YAG laser welded IN738LC was studied using several pre-weld heat treatment cycles. The results showed that liquation cracks in the alloy were associated with grain boundaries constituents such as gamma-gamma' eutectic, MC carbide, Cr-Mo boride and Ni-Zr intermetallic. The liquation cracking in the weld heat affected zone (HAZ) was observed to be affected by the hardness of base-alloy. In addition, the results revealed that the presence of Cr-Mo rich borides in the pre-weld alloy constitutes a major factor enhancing susceptibility to Equation cracking. The boride particles reduce the temperature at which non-equilibrium intergranular liquation initiates in the HAZ, during the heating cycle of welding. Gleeble physical simulation revealed that in samples heat treated at 1050 degrees C for 2 h, the Equation started at significantly lower temperatures than in 1120 degrees C solution heat treated samples, this is attributed to the occurrence of the boride particles in the 1050 degrees C samples, which had dissolved by the 1120 degrees C heat treatment. (C) 2012 Elsevier Inc. All rights reserved.
引用
收藏
页码：65 / 73
页数：9
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