Effect of Severe Cold-Rolling and Subsequent Annealing on Microstructure and Properties of in-Situ Composite Steel

Jun Zhao; Han Zhang; Yong Ming Yang; Jiu Chuan Chen; Quan Xing Wen; Zhi Wang; Li Tao Zhang; Yu Wei Gao

doi:10.4028/www.scientific.net/MSF.667-669.157

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Effect of Severe Cold-Rolling and Subsequent Annealing on Microstructure and Properties of in-Situ Composite Steel
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HomeMaterials Science ForumMaterials Science Forum Vols. 667-669Effect of Severe Cold-Rolling and Subsequent...

Effect of Severe Cold-Rolling and Subsequent Annealing on Microstructure and Properties of in-Situ Composite Steel

Abstract:

In this paper, the process of severe cold-rolling and annealing for Q235 steel with lath martensite has demonstrated a new promising technique for producing in-situ composite multi-nanolayer steel. Cold rolling and subsequent annealing have great impact on microstructure evolution as well as mechanical properties. In the as-rolled state, the strength (b 2112 MPa) is approximately four times increased than as-received material, which is attributed to work hardening and grain refining during cold rolling. As cold-rolled sample subjected to further annealing below 500 °C, deformed microstructure underwent further recovery and recrystallization and finally became refined equiaxed grains; ultraﬁne ferrite grains, nano-carbides precipitated uniformly were seen in the specimen annealed at 500 °C, and the phenomenon of fracture delamination was observed from the specimens, the delamination plane was parallel to the rolling plane, in-situ composite weak interfaces effect has great impact on the fracture surface. Annealing at and above 600 °C resulted in coarse ferrite grains with spheroidized coarse carbides, causing grain growth.