铌钛微合金化对δ-相变诱导塑性钢组织和拉伸性能的影响
Influence of Nb and Ti Microalloying on Microstructure and TensileProperties of δ-Transformation Induced Plasticity Steel
摘 要
在δ-相变诱导塑性（δ-TRIP）钢中添加铌与钛元素，研究了铌钛微合金化对该钢显微组织与拉伸性能的影响。结果表明：试验钢组织沿轧制方向呈带状分布，主要由δ铁素体条带与α铁素体/残余奥氏体条带组成，铌钛微合金化细化了试验钢中铁素体晶粒，使铁素体中形成了大量的小角度晶界，并降低了残余奥氏体含量；铌钛微合金化试验钢中形成了尺寸约5 μm的矩形（Nb，Ti）（C，N）相和尺寸为50~200 nm的椭圆形Ti （C，N）相；与未添加铌与钛的试验钢相比，铌钛微合金化试验钢的屈服强度和抗拉强度分别增加了65，37 MPa，而断后伸长率由33.3%降低至30.4%；在拉伸过程中，铌钛微合金化试验钢中的裂纹在铁素体与马氏体界面处和（Nb，Ti）（C，N）相处形核，断裂类型为由韧性断裂和解理断裂组成的复合断裂。
铌钛微合金化
显微组织
拉伸性能
析出相
δ-TRIP steel
Nb and Ti microalloying
microstructure
tensile property
precipitate
Abstract
The influence of Nb and Ti microalloying on the microstructure and tensile properties of δ-transformation induced plasticity (δ-TRIP) steel was investigated by adding Nb and Ti element into the steel. The results show that the microstructure of the test steel had a banding distribution along the rolling direction, and was composed of δ-ferrite bands and α-ferrite/retained austenite bands. After the test steel was microalloyed by Nb and Ti, the ferrite grain in the test steel was refined; a large number of low angle boundaries were formed inside the ferrite, and the content of retained austenite decreased. Rectangle (Nb, Ti)(C, N) phase with size of about 5 μm and oval Ti(C, N) phase with size of 50-200 nm precipitated in the Nb/Ti-microalloyed test steel. Compared with those of test steel without adding Nb and Ti, the yield strength and tensile strength of Nb/Ti-microalloyed test steel increased by 65, 37 MPa, respectively, and the percentage elongation after fracture decreased from 33.3% to 30.4%. The cracks in the Nb/Ti-microalloyed test steel initiated at the interface between ferrite and martensite and at (Nb, Ti)(C, N) phase, and the fracture type was a composite fracture composed of ductile fracture and cleavage fracture.
中图分类号 TG142.1 DOI 10.11973/jxgccl202007013
所属栏目 材料性能及应用
基金项目
收稿日期 2020/2/25
修改稿日期 2020/6/11
网络出版日期
作者单位点击查看
备注王俊峰(1985-),男,河南洛阳人,工程师,博士
引用该论文: WANG Junfeng,WANG Li. Influence of Nb and Ti Microalloying on Microstructure and TensileProperties of δ-Transformation Induced Plasticity Steel[J]. Materials for mechancial engineering, 2020, 44(7): 60～65
王俊峰,王利. 铌钛微合金化对δ-相变诱导塑性钢组织和拉伸性能的影响[J]. 机械工程材料, 2020, 44(7): 60～65
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