On intergranular tempered martensite embrittlement

Journal Article · Sat Apr 15 00:00:00 EDT 1995 · Scripta Metallurgica et Materialia

DOI:https://doi.org/10.1016/0956-716X(95)00125-F· OSTI ID:55428

Lee, K B; Yoon, S H; Hong, S I; Kwon, H ^[1]

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1. Kookmin Univ., Seoul (Korea, Republic of)

Tempering of martensitic alloy steels is generally required to impart adequately high toughness instead of brittleness in the as-quenched state. When hardened steels are tempered in the range of 250--400 C, however, a loss in toughness can occur in spite of the decrease in strength with increasing tempering temperature. This phenomenon is referred to as tempered martensite embrittlement (TME). In this study, the intergranular type of TME has been analyzed in terms of impact toughness and fracture behavior on isothermal and isochronal tempering. The alloy systems chosen are the commercial 4140 and 4340 steels. The 4340 steel contains the alloying element Ni which enhances the intrinsic toughness.

• OSTI ID: 55428
• Journal Information: Scripta Metallurgica et Materialia, Journal Name: Scripta Metallurgica et Materialia Journal Issue: 8 Vol. 32; ISSN 0956-716X; ISSN SCRMEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BRITTLENESS
CHARPY TEST
CHEMICAL COMPOSITION
FRACTURE PROPERTIES
GRAIN SIZE
IMPURITIES
MARTENSITIC STEELS
METALLURGICAL EFFECTS
MICROSTRUCTURE
TEMPERING