700 MPa级低碳微合金钢的连续冷却相变组织及强韧性
Continuous Cooling Transformation Microstructure and Strength-Toughness of 700 MPa Low Carbon Microalloyed Steel
摘 要
利用Gleeble-3500型热/力模拟试验机测定了700MPa级低碳微合金钢的连续冷却相变(CCT)曲线, 分析了冷却速率对该钢连续冷却相变及显微组织的影响, 研究了该钢的强韧性。结果表明: 该钢CCT曲线呈现扁平状, 可在较大冷速范围内获得低碳贝氏体组织; 冷却速率对试验钢各相的形态、数量、分布和显微硬度均有影响; 随着冷却速率的提高, 显微组织中依次出现多边形铁素体(PF)、针状铁素体(AF)、粒状贝氏体(GB)和板条贝氏体(LB), 且各相的显微硬度也依次增加; 当冷速在10～30 ℃·s-1范围时, 显微组织主要为板条贝氏体组织, M/A组元弥散分布于晶界上, 且晶粒随着冷却速率的增加而逐渐细化; 利用冷却制度控制中温转变组织类型能优化其综合力学性能。
静态CCT曲线
显微组织
显微硬度
low carbon micro-alloyed steel
static CCT curve
microstructure
micro-hardness
Abstract
Gleeble-3500 thermo-simulation machine was employed to determine the continuous cooling transformation (CCT) curves of 700 MPa low carbon microalloyed steel. The effects of cooling rate on phase transition behavior and microstructure were investigated. The results indicate that the CCT curves were in flat shape and the low carbon bainite structure was obtained in a large cooling rate range. The cooling rates had great effects on the form, proportion, distribution and micro-hardness of phases. The microstructure in experimental steel were changed from polygonal ferrite, acicular ferrite, granular bainite to lathe bainite with micro-hardness increasing when cooling rate became faster. When the cooling rate was between 10 ℃·s-1 and 30 ℃·s-1, the microstructure of the experimental steel was mainly compound of lathe bainite, and the M/A constituents dispersed on the grain boundaries. Futhermore, the size of lathe bainite became smaller with the cooling rate increasing. Therefore controlling the intermediate temperature transformation products using a proper cooling process could improve comprehensive mechanical property of experimental steel on the basis of analyzing of its phase transition characteristics.
中图分类号 TG142.1 DOI 10.11973/jxgccl201506007
所属栏目 试验研究
基金项目 合肥通用机械研究院青年科技基金项目(2013010651)
收稿日期 2014/4/23
修改稿日期 2015/4/20
网络出版日期
作者单位点击查看
备注徐亮(1979—), 男, 江西南昌人, 高级工程师, 硕士。
引用该论文: XU Liang,ZHANG Xiao-hu,HUANG Jin-guo,FANG Guo-ai,JIANG Hui-feng,LI Shu-rui. Continuous Cooling Transformation Microstructure and Strength-Toughness of 700 MPa Low Carbon Microalloyed Steel[J]. Materials for mechancial engineering, 2015, 39(6): 29～35
徐亮,章小浒,黄金国,方国爱,江慧丰,李书瑞. 700 MPa级低碳微合金钢的连续冷却相变组织及强韧性[J]. 机械工程材料, 2015, 39(6): 29～35
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【2】王有铭, 李曼云, 韦光.钢铁的控制轧制和控制冷却[M]. 北京: 冶金工业出版社, 2009.
【3】贺信莱, 尚成嘉, 杨善武. 高性能低碳贝氏体钢-成分、工艺、组织、性能与应用[M]. 北京: 机械工业出版社, 2008: 152.
【4】BARBACKI A, MIKOLAJSKI E. Optimization of heat treatment conditions for maximum toughness of high strength silicon steel[J].Journal of Materials Processing Technology, 1998, 78(1): 18-23.
【5】王国栋. 新一代控制轧制和控制冷却技术与创新的热轧过程[J]. 东北大学学报: 自然科学版, 2009, 30(7): 913-922.
【6】胡良均, 尚成嘉, 王学敏, 等. 弛豫-析出-控制相变技术中冷却速度对组织的影响[J]. 北京科技大学学报, 2004, 26(3): 260-263.
【7】雍岐龙.钢铁材料中的第二相[M]. 北京: 冶金工业出版社, 2006: 145.
【8】段修刚, 蔡庆伍, 武会宾. Ti-Mo全铁素体基微合金高强钢纳米尺度析出相[J]. 金属学报, 2011, 47(2): 251-256.
【9】RODRIGUES P C M, PERELOMA E V, SANTOS D B. Mechanical properties of HSLA bainitic steel subjected to controlled rolling with accelerated cooling[J]. Materials Science and Engineering: A, 2000, 283: 136-143.
【10】尚成嘉, 王学敏, 杨善武, 等. 高强度低碳贝氏体钢的工艺与组织细化[J]. 金属学报, 2003, 39(10): 1019-1024.
【11】ABALLERO F G, SANTOFIMIA M J, CHAO J, et al. Theoretical design and advanced microstructure in super high strength steels[J].Materials and Design, 2009, 30(16): 2077-2083.
【12】ZHOU Yun-long, LUO Dong-mei. Microstructure and mechanical properties of Ti-Mo alloys cold-rolled and heat treated[J]. Materials Characterization, 2011, 62(10): 931-937.
【13】赵文龙, 孙蓟泉, 武会宾, 等. 孙薇高强度钢Q800厚板在不同状态下的组织、性能和析出物形貌[J]. 机械工程材料, 2013, 37(4): 22-25.
【14】徐亮, 王利, 章敏, 等. 汽车罐车用17MnNiVNbR钢板的性能[J]. 机械工程材料, 2014, 38(5): 52-56.
【15】周洪宝, 蔡庆伍, 武会宾, 等. 连续缓慢冷却贝氏体转变特征及合金元素分布的影响[J]. 材料工程, 2011, (12): 10-15.
【16】SAHA PODDER A, BHADESHIA H K D H. Thermal stability of austenite retained in bainitic steels[J]. Materials Science and Engineering: A, 2010, 527: 2121-2128.
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【19】张小立. 再加热工艺对X100管线钢组织和性能的影响[J]. 机械工程材料, 2013, 37(7): 6-9.
【20】梁宇, 石芷伊, 梁益龙. 钒含量对不同冷速冷却后高碳珠光体钢显微组织的影响[J]. 机械工程材料, 2013, 37(8): 19-22.
【21】高宽, 王六定, 朱明, 等. 低合金超高强度贝氏体钢的晶粒细化与韧性提高[J]. 金属学报, 2007, 43(3): 315-320.
【22】陈林恒, 康永林, 黎先浩. 回火温度对600MPa 级低碳贝氏体钢组织和力学性能的影响[J]. 北京科技大学学报, 2009, 31(8): 983-987.
【23】余灿生, 赵昆渝, 贾书君, 等. 调质工艺对C95石油套管用钢组织的影响[J]. 机械工程材料, 2014, 38(2): 2-6.
【24】尚成嘉, 杨善武, 王学敏, 等. 新颖的铁素体/贝氏体双相低碳微合金钢[J]. 北京科技大学学报, 2003, 25(3): 288-290.
【25】CABALLERO F G, CHAOA J, CORNIDEA J, et al. Toughness deterioration in advanced high strength bainitic steels[J].Materials Science and Engineering: A, 2009, 525: 87-95.
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