Effect of post weld heat treatment on microstructure and mechanical properties of stainless maraging steel weldments
The microstructure, hardness distribution and tensile properties of 0Cr13Ni7MoTi stainless maraging steel laser weldments were investigated after different post welding heat treatments. The results show that the microstructure across the weldment consists of three regions, namely fusion zone, heat affected zone (HAZ) and base metal zone. According to the features of weldments, 2000 W and 2500 W are appropriate laser powers. The microstructure of weldments after aging at temperatures ranging from 420 ℃ to 460 ℃ changed little under optical microscope, however, as the aging temperature increases to 480 ℃, a litter amount of reverted austenite formed on the prior austenite grain boundary. The microhardness and yield strength of weldments after aging is higher than those without heat treatment, the highest microhardness across the weldment increases to 490 -500 HV, and the yield strength increases by 67. 3% after 460 ℃×3 h aging treatment.
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