Effects of cooling rate on solidification cracking behaviour in 310S stainless steel
Effects of cooling rate on solidification cracking behaviour in 310S stainless steel
复制标题
冷却速率对310S不锈钢凝固裂纹行为的影响
DOI：
10.1016/j.jajp.2021.100044
复制
发表时间：
2021
影响因子：
4.1
通讯作者：
Kazuyoshi Saida
中科院分区：
文献类型：
--
作者：
Jae-Hyeong Lee;Shotaro Yamashita;Tomo Ogura;Kazuyoshi Saida
为了改变焊接熔池的冷却速度，在U型热裂纹试验中，对钨极氩弧焊熔池后进行激光原位加热。观察到基于冷却速率变化的凝固裂纹的发生。通过计算高温塑性曲线和热应变曲线，研究了凝固裂纹行为与冷却速度的关系。结合临界应变和凝固脆性温度区间，得到了高温塑性曲线。采用原位观测技术测量了临界应变。通过金相分析模型估算了凝固开始和完成温度。采用有限元模拟方法计算了热应变曲线。高温塑性曲线没有明显的变化，根据焊接条件。然而，冷却速率的降低恶化了屈服强度分布，并增加了施加到焊缝的应力和热应变曲线的斜率，增加了凝固裂纹的脆弱性。
In order to change the cooling rate of weld pool, in-situ laser post-heating was irradiated behind the weld pool during gas tungsten arc welding in a U-type hot cracking test. The solidification cracking occurrence based on the cooling rate change was observed. The high temperature ductility curve and thermal strain curve were calculated to investigate the relationship between solidification cracking behaviour and cooling rate. The high temperature ductility curve was obtained based on the combination of the critical strain and solidification brittleness temperature range. An in-situ observation technique was used to measure the critical strain. The solidification initiation and completion temperatures were estimated by the metallurgical analysis model. The thermal strain curve was calculated using a finite element simulation method. The high temperature ductility curve did not significantly changed according to the welding conditions. However, the decrease of cooling rate deteriorated yield strength distribution and increased both the stress applied to the weld bead and the slope of thermal strain curve, increasing vulnerability to solidification cracking.
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