PINE CONE LIKE FRACTURE SURFACE AND TEMPER EMBRITTLEMENT OF 5. 5%Ni STEELS.

Masato Murakami, Koji Shibata, Kotobu Nagai, Toshio Fujita

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Abstract

Pine cone fracture surfaces were observed in Charpy and compact tension specimens of cryogenic Ni steels containing retained austenite. These steels, especially those bearing no molybdenum, were embrittled on slow cooling from final tempering. ″Pine cone″ is a kind of intergranular fracture surface produced by fracture along P segregated alpha prime / gamma interfaces which formed at prior austenitic grain boundaries. Intercritical heat treatment promoted austenite formation and suppressed fracture.

Original languageEnglish
Pages (from-to)806-814
Number of pages9
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume69
Issue number7
Publication statusPublished - 1983 May
Externally publishedYes

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ASJC Scopus subject areas

  • Metals and Alloys

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