Segregation of phosphorus and sulfur in heat-affected zone hot cracking of type 308 stainless steel
Auger Analysis, Heat-Affected Zone (HAZ), Hot Cracking, P and S Segregation, Phosphorus, Stainless Steel, Sulfur
Welding Journal (Miami, Fla)
The Auger microprobe analysis method was employed to identify the presence and characterize the degree of interfacial segregation of P and S associated with weld heat-affected zone hot cracking in Type 308 austenitic stainless steel. Crack surface samples for Auger analysis were produced under a controlled evacuated and argon back-filled atmosphere on a Gleeble™ thermomechanical simulator. Sulfur was found to strongly segregate to the intergranular fracture surface, while segregation of P, confirmed by earlier EDS analysis, was undetected by the Auger equipment employed. The relatively stronger tendency for S to segregate correlates well with this element's higher diffusion rate compared to P and with cracking susceptibility test results (Ref. 1), which showed S to be more detrimental than P to HAZ cracking.
Original Publication Date
Li, Leijun and Messler, R. W., "Segregation of phosphorus and sulfur in heat-affected zone hot cracking of type 308 stainless steel" (2002). Faculty Publications. 3400.