A Study of Toughness Degradation in CA6NM Stainless Steel

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The mechanism of toughness degradation during slow cooling in the austenite range was studied in CA6NM stainless steel, 13% Cr-4% Ni soft martensitic stainless steel. The variation of toughness, fracture mode and microstructural features were examined by means of cooling rate and isothermal heating in the austenite range together with chemical composition. Toughness degradation was referred to as the increases of FATT and intergranular fracture when those steels were cooled slowly after austenitizing and isothermally heated in the austenite range. The embrittlement was found to be related the intergranular fracture and the precipitation of carbide along prior austenite grain boundaries. Its fracture surface was characterized by mosaic-like markings when the carbide precipitation got to increase. Reducing carbon, silicon and phosphorus and increasing molybdenum improve the toughness degradation.

Info:

Periodical:

Materials Science Forum (Volumes 654-656)

Main Theme:

Edited by:

Jian-Feng Nie and Allan Morton

Pages:

2515-2518

DOI:

10.4028/www.scientific.net/MSF.654-656.2515

Citation:

Y. Iwabuchi and I. Kobayashi, "A Study of Toughness Degradation in CA6NM Stainless Steel", Materials Science Forum, Vols. 654-656, pp. 2515-2518, 2010

Online since:

June 2010

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Price:

$35.00

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