论文部分内容阅读
以低碳贝氏体钢HQ785为实验材料,利用Gleeble-3500热/力模拟试验机进行不同单向外加拉应力下的相变试验,通过光学显微镜分析了奥氏体组织,并测试了相变后的维氏硬度。结果表明:施加外加拉应力使奥氏体的平均晶粒尺寸和晶粒的不均匀性增大,相变组织的硬度增加;与持续应力相比,施加瞬态应力时的奥氏体平均晶粒尺寸较小,晶粒较为均匀,相变组织的硬度较低。
The low carbon bainitic steel HQ785 was used as the experimental material, and the phase transformation under different uniaxial external tensile stress was conducted by Gleeble-3500 thermal / mechanical simulation tester. The austenite structure was analyzed by optical microscope and the phase transition After the Vickers hardness. The results show that the average austenite grain size and grain heterogeneity increase with the application of external tensile stress, and the hardness of the phase transformation structure increases. Compared with the continuous stress, the average austenite grain size The grain size is smaller, the grain is more uniform, and the phase change microstructure is lower in hardness.