EMBRITTLEMENT OF 5. 5%Ni STEELS ON SLOW COOLING FROM THE FINAL TEMPERING.

Kotobu Nagai, Koji Shibata, Masato Murakami, Toshio Fujita

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Embrittlement on slow cooling was studied in intercritically heat treated cryogenic nickel steels which contain reverted austenites. The 5. 5% Ni steels with different Mo and Cr contents were QLT treated and reheated at 600 degree C for 20 min and cooled at a rate of about 0. 2 K/min to temperatures at which cooling was interrupted by water quenching. Three types of embrittlement took place depending on chemical compositions and interrupted temperatures. Intergranular failure was a characteristic feature in Mo free and 0. 4 Mo steels. In the case of 0. 2 and 0. 8 Mo steels, no intergranular fracture was observed and quasi-cleavage fracture became more dominant with a decrease in the intermediate quenching temperature. As cooling proceeded the yield strength decreased or remained at a low level at first, increased gradually and reached a constant level. For 0. 6Cr-0. 4 and 0. 8Mo steels, martensitic transformation of the unstable austenite appeared at a low tensile stress level and decreased both yield strength and toughness.

Original languageEnglish
Pages (from-to)462-469
Number of pages8
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume69
Issue number3
Publication statusPublished - 1983 Mar
Externally publishedYes

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tempering
Steel
Tempering
steels
Cooling
cooling
embrittlement
Embrittlement
yield strength
Yield stress
Quenching
nickel steels
quenching
Martensitic transformations
martensitic transformation
toughness
austenite
Nickel
tensile stress
Tensile stress

ASJC Scopus subject areas

  • Metals and Alloys

Cite this

EMBRITTLEMENT OF 5. 5%Ni STEELS ON SLOW COOLING FROM THE FINAL TEMPERING. / Nagai, Kotobu; Shibata, Koji; Murakami, Masato; Fujita, Toshio.

In: Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan, Vol. 69, No. 3, 03.1983, p. 462-469.

Research output: Contribution to journalArticle

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