连续退火工艺对超高强双相钢力学性能的影响  

Effect of continuous annealing process on mechanical properties of ultra-high strength dual phase steels

作　　者：代启锋[1] 宋仁伯[1] 郭志飞[1,2] 贺子龙[1] 杨富强[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]首钢技术研究院,北京100043

出　　处：《材料科学与工艺》2013年第3期6-13,共8页Materials Science and Technology

基　　金：国家高技术研究发展计划资助项目(2009AA03Z518);北京科技大学冶金工程研究院基础理论研究基金资助项目(YJ2010-006)

摘　　要：为研究连续退火工艺参数对超高强冷轧双相钢组织及力学性能的影响,在Gleeble-3500热力模拟实验机上,使用正交实验法设计连续退火工艺获得超高强冷轧双相钢.研究发现:连续退火工艺参数对抗拉强度和总延伸率的影响程度依次是:临界区退火温度>保温时间>过时效温度;两阶段应变硬化特性随马氏体体积分数的增加而更加明显:当马氏体体积分数在35%左右时,冷轧双相钢的应变硬化关系明显呈线性;当马氏体体积分数接近50%时,冷轧双相钢的应变硬化关系呈非线性,但两阶段的应变硬化指数n值变化不大,两阶段并由曲线过渡;当马氏体体积分数在65%左右时,冷轧双相钢的应变硬化关系呈非线性,两阶段的应变硬化指数n值变化较大,并出现明显拐点.To investigate the effects of continuous annealing parameters on the microstructures and mechanical properties of ultra-high strength cold-rolled dual phase（DP） steels,orthogonal design method were employed to produce ultra-high strength cold-rolled DP steels in the laboratory by Gleeble-3500 thermal simulator.The optimum annealing parameters can be obtained.According to the analysis of the ultimate tensile strength（UTS） and the elongation（A50）,the important influencing factors are the inter-critical annealing temperature,soaking time and over-aging temperature in sequence.Strain hardening behavior is analyzed in terms of Holloman analysis.Results show that two stage hardening characteristics of DP steels are encouraged with martensite volume fraction（Vm） increasing.Strain hardening relationship of cold-rolled DP steels with 35% of Vm is obvious linear,and strain hardening relationship of cold-rolled DP steels with 65% of Vm is nonlinear.

关 键 词：冷轧双相钢 连续退火 正交设计法 马氏体 应变硬化特性 

分 类 号：TG142.7[一般工业技术—材料科学与工程]