退火温度对冷轧Fe-0.4C-10Mn-6Al高强钢组织与力学性能的影响

通过光学显微镜、扫描电镜、电子万能拉伸试验机、X射线衍射以及背散射电子衍射等技术方法研究了退火温度对冷轧态Fe-0.4C-10Mn-6Al高强钢的组织与力学性能的影响。结果表明,试验钢冷轧后的微观组织主要为δ-铁素体、α-铁素体、奥氏体、马氏体与碳化物,退火后的组织主要由δ-铁素体、α-铁素体、奥氏体与碳化物组成,其中奥氏体含量因马氏体逆转变而随着退火温度升高而增加。随着退火温度的升高,屈服强度、抗拉强度均逐渐降低,伸长率逐渐提高。当退火温度达到800 ℃时,试验钢的强塑积达到27.84 GPa·%,有较好的综合力学性能。

Effect of annealing temperature on microstructure and mechanical properties of cold-rolled Fe-0.4C-10Mn-6Al high strength steel

Effect of annealing temperature on microstructure and mechanical properties of the cold-rolled Fe-0.4C-10Mn-6Al high strength steel was studied by means of optical microscope, scanning electron microscope, electronic universal tensile test machine, X-ray diffraction and backscattered electron diffraction. The results show that microstructure of the tested steel after cold rolling consists of δ-ferrite, α-ferrite, austenite, martensite and carbide. The annealed microstructure is mainly composed of δ-ferrite, α-ferrite, austenite and carbide, and the austenite content increases with the increase of annealing temperature due to reversed transformation of martensite. With the increase of annealing temperature, the yield strength and tensile strength decrease gradually, while the elongation increases gradually. When the annealing temperature reaches 800 ℃, the product of strength and elongation of the tested steel reaches 27.84 GPa·%, and has good comprehensive mechanical properties.