TEM study of the microstructure of HSLA100 steel

Journal Article · Tue Oct 01 04:00:00 EDT 1996 · Materials Characterization

DOI:https://doi.org/10.1016/S1044-5803(96)00003-4· OSTI ID:464789

Wenpu, Dong; Zuobao, Fu ^[1]; Lang, Yang ^[2]

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1. Anshan Iron and Steel Complex (China). Inst. of Iron and Steel Research
2. Univ. of Science and Technology, Beijing (China)

In this study, investigations of microstructures of as-quenched and aged HSLA100 steel by using transmission electron microscopy showed that as-quenched HSLA100 has a mixed microstructure of 50% lath martensite + 40% acicular ferrite + 9% retained austenite + 1% twinned martensite. During aging, HSLA100 undergoes the following microstructural changes: (1) tempering of lath martensite and twinned martensite, (2) recovery of acicular ferrite, and (3) precipitation of a second phase during aging. Retained austenite is very stable and remains undecomposed even after aging at 650 C for 1 1/2 h. The precipitates observed in this study include {epsilon}-Cu, Mo{sub 2}C, M{sub 23}C{sub 6}, TiN, and Nb(C,N). The contribution of precipitation strengthening for HSLA100 steel after 1 1/2 h of aging at 60 C is about 140 MPa.

• Sponsoring Organization: USDOE
• OSTI ID: 464789
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Journal Issue: 4 Vol. 37; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AGING
AUSTENITE
CARBIDES
FERRITE
LOW ALLOY STEELS
MARTENSITE
MICROSTRUCTURE
NITRIDES
PRECIPITATION
QUENCHING