The effects of hydrogen on the mechanical properties of 304L keyhole tungsten inert gas welded joint were investigated in the study. The presence of hydrogen resulted in a significant decrease in the macroscopic ductility of the weld metal, and fracture may be initiated at the sites of clustered dislocations due to hydrogen atoms. Moreover, it is found that hydrogen may result in more severe loss in ductility and noticeable decrease in the flow stress and strength of the base metal, because of the interplay between the hydrogen atoms and strain-induced α′ martensite. Strain-induced α′ martensitic transformation and phase boundaries in the base metal may provide more sites for the accumulation of hydrogen and dislocations, leading to an appreciable decrease in the ductility and strength of the base metal.

研究了氢对304L锁孔钨极惰性气体保护焊缝力学性能的影响。氢的存在导致焊缝金属的宏观延展性显着降低，并且由于氢原子的存在，可能在簇状位错的位置引发断裂。而且，发现由于氢原子和应变诱发的α'马氏体之间的相互作用，氢可能导致延展性的更严重损失以及母材的流动应力和强度的显着降低。母材中的应变诱导α'马氏体相变和相界可能会提供更多的氢积累和位错位点，从而导致母材的延展性和强度明显下降。