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Environmentally assisted cracking susceptibility of dark etched HAZ/ parent metal interface region of 18Ni 250 maraging steel weldment
Materials Science and Engineering: A ( IF 4.081 ) Pub Date : 2020-01-03 , DOI: 10.1016/j.msea.2020.138911
Renu N. Gupta; V.S. Raja

Gas tungsten arc welding is widely employed to fabricate large sized motor casings made of 18Ni 250 maraging steel. However, small transverse cracks have been found to appear at the interface of the dark etched heat affected zone (HAZ) of such weldments after about a year of welding, prior to aging treatment. In order to understand the delayed cracking phenomena vis-à-vis the influence of multiple weld passes, thermal cycles were obtained at different locations of the heat affected zone. The results suggest the formation of two more HAZs designated as HAZ III and HAZ IV in addition to those two currently reported in the literature. The two regions namely, HAZ III and HAZ IV, respectively correspond to peak aging and under aging conditions of the alloy. In order to examine the effect of these thermal cycles on the environmentally assisted cracking of the weldment, thermal simulations corresponding to various HAZs were applied on to specimens with Gleeble. They were examined for their susceptibility to EAC in neutral and acidified 0.1 M NaCl solutions. The study reveals that it is only the HAZ IV, lying at the interface of the dark etched HAZ, corresponding to under aging condition, is responsible for the weld failure.
更新日期:2020-01-04

 

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