Welded Joint Cracking in Martensitic Stainless Steel Precipitation-Sthregthened with Copper / Pękanie Złącz Spawanych Stali Nierdzewnej Martenzytycznej Utwardzanej Wydzieleniowo Miedzią

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Problem of welded joint cracking in the HAZ of Cu strengthened 17-4PH grade precipitation hardening martensitic stainless steel is presented. Hypothesis concerning hydrogen embrittlement origin of the cracks is opposed. It was concluded that the cracks located in the high-temperature zone of the HAZ exhibit characteristics of hot cracks which originated as a result of steel embrittlement in the presence of Cu rich liquid phase. The mechanism of steel surface enrichment in Cu is proposed. Practical methods of cracks elimination are presented.

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Archives of Metallurgy and Materials

The Journal of Institute of Metallurgy and Materials Science and Commitee on Metallurgy of Polish Academy of Sciences

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