On the transgranular type of tempered martensite embrittlement

Journal Article · Sun May 01 00:00:00 EDT 1994 · Scripta Metallurgica et Materialia; (United States)

OSTI ID:5263807

Lee, Kon Bae; Yoon, Sang Hoon; Kwon, Hoon ^[1]

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1. Kookmin Univ., Seoul (Korea, Republic of). Dept. of Metallurgy and Materials Engineering

Martensitic alloy steels are subject to tempering because of their low toughness in the as-quenched state. When tempered in the range of 250--400 C, however, the toughness drops in spite of the decrease in strength with increasing the tempering temperature. This phenomenon is referred to as tempered martensite embrittlement (TME). TME can be classified into two types according to the fracture mode; intergranular and transgranular TME. The transgranular type was suggested to be caused by the formation of coarse carbides at the lath boundaries following the decomposition of retained austenite. In this study, the transgranular type of TME has been analyzed in terms of impact toughness, fracture behavior and microstructure on isothermal tempering. The experimental alloy systems chosen are the Mo and MoW steels in which alloying elements, Mo and W, may decrease the intrinsic toughness and thus produce easy transgranular brittle fracture.

• OSTI ID: 5263807
• Journal Information: Scripta Metallurgica et Materialia; (United States), Vol. 30:9; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
MARTENSITIC STEELS
EMBRITTLEMENT
MOLYBDENUM
METALLURGICAL EFFECTS
TUNGSTEN
CARBIDES
EXPERIMENTAL DATA
FRACTURE PROPERTIES
ALLOYS
CARBON COMPOUNDS
DATA
ELEMENTS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
MECHANICAL PROPERTIES
METALS
NUMERICAL DATA
STEELS
TRANSITION ELEMENTS
360103* - Metals & Alloys- Mechanical Properties