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The high alloy precipitation hardening martensitic steels and their suitability for welding

Pawlak S., Dudek S.

Archives of Materials Science and Engineering

2010

Vol. 41, nr 2

69-76

Purpose: Present work was aimed at developing welding technology applicable for hot and cold rolled strips made of high alloy martensitic steels. Electron beam (EB) and TIG welding processes parameters were worked out for strips of the 2N11K13H3M, N19M4T, H11N10M2T and PH13-8 steel grades (unconventional maraging and precipitation hardening stainless steel grades). Design/methodology/approach: The heats of the steels were laboratory vacuum melted, forged and then hot and cold rolled. Welding process parameters were experimentally selected. Quality of the welds was evaluated by several non-destructive techniques and metallographic examination. Hardness distribution and tensile properties of welded strips were analyzed, and post weld heat treatment was proposed. Findings: All four steel grades studied were suitable for the electron beam welding and optimum process parameters were worked out for the 3 mm strips. The suitability of the steels to welding using the TIG process was tested with 1.5 mm strips. Apart from the high cobalt maraging steel, which was not available in the form of thin strips, the other steels were welded successfully in TIG process. After welding, strength of the steels could be largely restored by full heat treatment. Research limitations/implications: Further research is needed on weld microstructure evolution, affected by welding processes, to improve fracture properties of welds. Practical implications: Welding technology of the hot and cold rolled strips of the four steel grades, high alloy martensitic grade, was developed, which along with very high mechanical properties and ductile fracture modes, make the steels suitable for advanced structural applications. Originality/value: Progress achieved in welding technology development is of practical value for manufacture of the structural elements, made of high alloy martensitic steels in the form of hot and cold rolled strips.