WELDED JOINT CRACKING IN MARTENSITIC STAINLESS STEEL PRECIPITATION-STHREGTHENED WITH COPPER
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...
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Veröffentlicht in: | Archives of metallurgy and materials 2012-01, Vol.57 (4), p.1055-1061 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | 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.Original Abstract: W artykule przedstawiono problem pekania w strefie wplywu ciepla stali nierdzewnej martenzytycznej utwardzanej wydzieleniowo miedzia. Podwazono literaturowe informacje wskazujac, ze sa to pekniecia zimne spowodowane kruchoscia wodorowa. Stwierdzono, ze pekniecia zlokalizowane w wysokotemperaturowym obszarze SWC maja charakter pekniec goracych i powstaly w wyniku kruchosci stali w obecnosci cieczy bogatej w miedz. Wyjasniono mechanizm wzbogacania sie powierzchni stali w miedz oraz podano technologiczny sposob eliminacji pekniec. |
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ISSN: | 1733-3490 |
DOI: | 10.2478/v10172-012-0117-1 |