(1. School of Metallurgical Engineering, Anhui University of Technology, Ma’anshan 243002, Anhui, China 2. Institute of Structural Steels, Central Iron and Steel Research Institute, Beijing 100081, China)
Abstract:The 100 MPa ultra low yield point steel was successfully prepared through the composition design of ultra-low carbon plus Nb and the post-rolling softening heat treatment,the microstructure and properties were researched,and the softening mechanism was discussed. The results showed that before and after softening heat treatment,the microstructure of test steel was single polygonal ferrite,ferrite grains and precipitated phase Nb(C,N) coarsen as the softening heat treatment temperature increases. In particular,the transformed ferrite grain size after re-austenitization at 950 ℃ heat treatment exceeded 90 μm. The sum of the solid solution and precipitation strengthening increments corresponded well with the variation curve of the yield strength at different softening heat treatment temperatures. The main reason for the yield strength decreases as the temperature of softening heat treatment increases was that precipitation strengthening and fine-grained strengthening increments both decreased,but C and N atoms re-dissolved to cause a rise in yield strength. The best comprehensive mechanical properties of test steel were obtained through softening heat treatment at 850 ℃,strength and plasticity of test steel both well after 950 ℃ softening heat treatment,but coarse grains resulted in low toughness.
陈润农,李昭东,张明亚,王慧敏,杨忠民,雍岐龙. 铌微合金化极低屈服点钢的组织与性能[J]. , 2019, 54(1): 63-70.
CHEN Run-nong,,LI Zhao-dong,ZHANG Ming-ya,WANG Hui-min,YANG Zhong-min,YONG Qi-long. Microstructure and properties of Nb microalloyed ultra low yield point steel. Iron and Steel, 2019, 54(1): 63-70.
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