Effects of Austenitizing Time on Microstructure and Tensile Properties of Low-Carbon Steel Treated with I&Q&P Process
摘 要
在不同奥氏体化时间下对低碳硅锰钢进行I&Q&P处理, 研究了奥氏体化时间对试验钢组织与拉伸性能的影响。结果表明: 短时间奥氏体化不能完全消除之前锰元素在双相区的配分结果; 奥氏体化时间达到300 s后, 试验钢的室温组织为板条状马氏体和残余奥氏体; 随奥氏体化时间延长, 试验钢的抗拉强度先升高后降低, 最高可达1 267 MPa, 但试验钢的伸长率则不断降低; 刚完成完全奥氏体化时, 晶粒尺寸较小, 且碳、锰的聚集程度最佳, 此时残余奥氏体的含量最高, 形变过程中TRIP效应明显, 使得伸长率的降低得以补偿; 奥氏体化时间为300 s时, 试验钢的强塑积最高, 可达30 345 MPa·%。
Abstract
Intercritical annealing austenization & quenching & partitioning (I&Q&P) process was carried out on low carbon Si-Mn steel at different austenitizing times. The effects of austenitizing time on microstructure and tensile properties were investigated. The results show that the effect of Mn partitioning in intercritical zone was not eliminated by short time austenitizing; when the isothermal time was 300 s, the microstructure of tested steel at room temperature was lath martensite and retained austenite. As austenitizing time went on, the tensile strength of tested steel increased firstly and then decreased, and the max value was 1 267 MPa, but the elongation of tested steel decreased gradually. When the microstructure was just fully austenitic, austenite grain size was relatively small and the aggregation level of C and Mn partitioning was best, retained austenite content was the highest at this moment, TRIP effect was obvious during deformation, those can compensate for the decrease of the elongation. When the austenitizing time was 300 s, the tested steel had highest product of strength and elongation, the highest value was 30 345 MPa·%.
中图分类号 TG142.4 DOI 10.11973/jxgccl201611011
所属栏目 试验研究
基金项目 国家自然科学基金资助项目(51574107); 河北省自然科学基金资助项目(E2016209048); 河北省教育厅科研项目(QN2016185); 唐山市科技创新团队培养计划项目(15130202C)
收稿日期 2015/7/28
修改稿日期 2016/9/19
网络出版日期
作者单位点击查看
备注王跃华(1980-), 男, 河北赵县人, 助理研究员。
引用该论文: WANG Yue-hua,LI Ran,SONG Jin-ying,WEI Ying-li,DAI Xin,CHEN Lian-sheng. Effects of Austenitizing Time on Microstructure and Tensile Properties of Low-Carbon Steel Treated with I&Q&P Process[J]. Materials for mechancial engineering, 2016, 40(11): 54~57
王跃华,李 然,宋进英,魏英立,代 鑫,陈连生. 奥氏体化时间对I&Q&P工艺处理低碳硅锰钢组织和拉伸性能的影响[J]. 机械工程材料, 2016, 40(11): 54~57
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参考文献
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【2】CLARK A, SPEER J, MILLER M, et al. Carbon partitioning to austenite from martensite or bainite during the quench and partition(Q-P) process: a critical assessment[J]. Acta Materialia, 2008, 56(1): 16-22.
【3】任勇强,谢振家,尚成嘉. 低碳钢中残余奥氏体的调控及对力学性能的影响[J]. 金属学报, 2012, 48(9): 1074-1080.
【4】任勇强, 谢振家, 尚成嘉. 低碳多相钢的组织调控与力学性能[J]. 北京科技大学学报, 2013(5): 592-600.
【5】庄宝潼, 唐荻, 江海涛, 等. Q&P工艺对0.3C-1.35Mn-1.30Si钢力学性能的影响[J]. 材料热处理学报, 2011, 32(11): 34-38.
【6】BAGLIANI E P, SANTOFIMIA M J, ZHAO L, et al.Microstructure, tensile and toughness properties after quenching and partitioning treatments of a medium-carbon steel[J].Materials Science & Engineering A,2013,559: 486-495.
【7】李文娟, 王利, 冯伟骏, 等. 配分温度对碳-锰-硅钢显微组织与力学性能的影响[J]. 机械工程材料, 2011, 35(9): 61-63.
【8】WUA R M, WANG L, JIN X J. Thermal stability of austenite and properties of quenching & partitioning (Q&P) treated AHSS[J]. Physics Procedia, 2013, 50: 8-12.
【9】CAI Z H, DING H, MISRA R D K, et al.Austenite stability and deformation behavior in a cold-rolled transformation-induced plasticity steel with medium manganese content[J]. Acta Materialia, 2015, 84: 229-236.
【10】TSUCHIYAMA T, TOBATA J, TAO T, et al.Quenching and partitioning treatment of a low-carbon martensitic stainless steel[J]. Materials Science & Engineering A, 2012, 532: 585 -592.
【11】陈银莉, 蒯振, 赵爱民, 等. 退火及配分温度对Si-Mn系Q&P钢组织和性能的影响[J].材料热处理学报, 2013, 34(9): 74-79.
【12】尹鸿祥, 赵爱民, 赵征志, 等. Mn含量对低碳中锰TRIP钢组织性能的影响[J].材料科学与工艺, 2014, 22(3): 11-15.
【13】李振, 赵爱民, 曹佳丽, 等. 高强中锰TRIP钢的残余奥氏体含量及其稳定性[J]. 机械工程材料, 2012,36(1): 62-64.
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