Structure and morphology of M-A constituent in the CGHAZ of a quenched and tempered ultra-low-carbon steel
Source abstract
Abstract
The structure of martensite–austenite (M-A) constituents in the coarse-grained heat-affected zone of an ultra-low-carbon quenched and tempered plate was studied via multiscale characterization. The study shows that the M-A constituents transformed from a full lath-type martensite to mixed M-A constituents with peripheral austenite and twin-type martensite. Besides, the interface structures between laths were also transformed from lath-type to twin-type martensite as the t8/5 increased. The peripheral austenite within the M-A constituents caused the ductile–brittle transition temperature of steel to decrease from 12.7 °C to 8.2 °C as the t8/5 increased from 79 to 105 s. The calculated critical microcrack size increased from 1.2 μm at t8/5 of 26 s to 1.5 μm at t8/5 of 79 s, then decreased to 1.3 μm at 105 s. The microstructural transformation could be interpreted as a result of the degree of enrichment of carbon in the retained austenite, as simulated by the Thermo-Calc/DICTRA software.
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Research context
OpenAlex topics: Microstructure and Mechanical Properties of Steels · Metal Alloys Wear and Properties · Hydrogen embrittlement and corrosion behaviors in metals
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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