Effect of Severe Cold-rolling and Subsequent Annealing on Microstructure and Properties of In-situ Composite Steel
In this paper, the process of severe coldrolling 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 (σb 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℃, 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℃, 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℃ resulted in coarse ferrite grains with spheroidized coarse carbides, causing grain growth.
Jun Zhao Han Zhang Yongming Yang Jiuchuan Chen Quanxing Wen Zhi Wang Litao Zhang Yuwei Gao
North China Institute of Aerospace Engineering,Langfang 065000,China College of Materials Science an North China Institute of Aerospace Engineering,Langfang 065000,China College of Materials Science and Engineering,Yanshan University,Qinhuangdao 066004,China
国际会议
5th International Conference on Nanomaterials by Severe Plastic Deformation(第五届剧烈塑性变形纳米材料国际会议)
南京
英文
157-160
2011-03-01（万方平台首次上网日期，不代表论文的发表时间）