Abstract：The microstructure refinement supplies an alternative approach to improve the strength of low carbon steel without loss of room temperature ductility. The microstructure evolution of weathering steel Cu-P-Cr-Ni-Mo in multi-pass hot deformation in the intercritical region was investigated by means of hot compression simulation. The results indicated that the fine ferrite grains of 1.8 μm can be achieved under the conditions of general large strain through multi-pass deformation in the intercritical region. The banded second phase distributed on the ferrite matrix and turned thinner with the passes increasing. Microstructural analysis shown that at the forehead passes deformation, the strain was large enough to lead strain enhanced ferrite transformation and promoted large number of ferrite nucleation, precipitation and refinement. While the continuously dynamic recrystallization of ferrite was responsible for the ferrite grains refinement at the latter passes deformation. A lot of subgrains appeared and the misorientation angle between subgtrains continuous increasing led to forming high angle grain boundaries (HAGBs) and the coarse grains were segmentated.
孔玉婷， 张春玲， 杨金凤， 单 梅. Cu-P-Cr-Ni-Mo耐候钢双相区多道次轧制模拟的组织演变[J]. 钢铁, 2014, 49(8): 81-87.
KONG Yu-ting, ZHANG Chun-ling, YANG Jin-feng, SHAN Mei. Microstructure Evolution of Cu-P-Cr-Ni-Mo Weathering Steel by Multi-Pass Rolling Simulating in the Intercritical Region. Iron and Steel, 2014, 49(8): 81-87.
2014, Vol. 49 
