A novel method for evaluating solidification cracking susceptibility of austenitic stainless steel using trapezoidal hot cracking test during laser welding
1
Issued Date
2024-08-01
Resource Type
ISSN
00303992
Scopus ID
2-s2.0-85186659747
Journal Title
Optics and Laser Technology
Volume
175
Rights Holder(s)
SCOPUS
Bibliographic Citation
Optics and Laser Technology Vol.175 (2024)
Suggested Citation
Wang D., Zhang F., Warinsiriruk E., Zhu Q., Li T., Li H., Xu N., Han K., Wang Z., Yang S. A novel method for evaluating solidification cracking susceptibility of austenitic stainless steel using trapezoidal hot cracking test during laser welding. Optics and Laser Technology Vol.175 (2024). doi:10.1016/j.optlastec.2024.110789 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/97518
Title
A novel method for evaluating solidification cracking susceptibility of austenitic stainless steel using trapezoidal hot cracking test during laser welding
Author's Affiliation
Corresponding Author(s)
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Abstract
A novel evaluation method was developed for evaluating solidification cracking susceptibility of austenitic stainless steel using trapezoidal hot cracking test laser welding. By changing different chemical compositions and welding speeds, the critical restraint width was named and regarded as a new index to evaluate cracking susceptibility. First of all, the average critical restraint width of SUS310S, 316 and 302 was measured as 22.97 mm, 18.17 mm and 17.38 mm during laser welding at a speed of 1.0 m/min, respectability. Single phase austenite under mode A appeared in 310S while the other could form austenite and a small amount of ferrite based on mode FA, therefore, the solidification cracking susceptibility was 310S > 316 > 302. Then, the critical restraint widths of SUS310S and 304 had a tendency of decrease with increasing welding speed from 0.5 m/min to 1.0 m/min during laser welding. The lower heat input could decrease primary and secondary dendrite arm spacings, causing a reduction in the segregation degree. In addition, the fine dendrite along grain boundary of weld center could contribute to form zigzag interface which would be beneficial to interrupt the continuous residual liquid film. Thus, the solidification cracking susceptibility tended to decrease with an increase in laser welding speed from 0.5 m/min to 1.0 m/min. Above all, the developed evaluation method could improve the applicability, feasibility and progressiveness of hot cracking test.