9/8/2023 0 Comments Sysweld Crackįigure 2a,b present the CCRs of the WMs as a function of the alloying component and diffusible hydrogen content, respectively. This is because martensite easily traps diffusible hydrogen and undergoes a volume expansion during the phase transformation thus, it is subjected to a residual tensile stress, which reduces the cold-cracking resistance. However, martensite is the hardest phase of the steel microstructure, and cold cracking frequently occurs in the martensite microstructure. With an appropriate fraction of acicular ferrite, it is possible to obtain WMs with high strength and toughness. Most studies have investigated the correlation between the mechanical properties and microstructural fraction as a function of the chemical composition. Previous studies on the microstructure of WMs have focused on imparting the WMs with high strength and toughness. Hence, under constant residual stress, the microstructure is the primary factor affecting cold cracking. As the application of low-hydrogen-type welding flux has recently increased, the contribution of diffusible hydrogen to cold cracking has decreased correspondingly. Cold cracking is known to be caused by complex interactions among factors such as the amount of diffusible hydrogen, low-temperature transformed microstructure, and residual tensile stress.
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