论文部分内容阅读
本项研究的处理工艺可以强化热轧双相(dual-phase DP)钢。为此研究了一种能达到局部强化的方法,即局部激光热处理(laser heat treatment LHT)。DP钢板以不同程度的预应变,用冷轧随后激光热处理达到整体而均匀的变形。经选择各种参数进行此项处理后,用光学显微镜(LOM)、扫描电镜(SEM)、透射电镜(TEM)、硬度测量和拉伸试验来评估热处理区的表面和横截面的显微组织,以及力学性能。结果说明用局部热处理能得到局部高强度。在较低的处理温度,这种效应可认为是烘烤强化(bake hardening BH),增加预应变和温度,从而提高局部性能。随着处理温度增加影响表面附近的初始组织。用激光局部强化DP钢开辟了一个新的领域,应用于把强化效应用到只影响感兴趣的相关区域,因此提供了节能的潜力和能设计零部件的性能。
The treatment process of this study can enhance dual-phase DP steel. To this end, a method to achieve local enhancement is studied, namely, laser heat treatment (LHT). DP steel to varying degrees of pre-strain, followed by cold-rolled laser heat treatment to achieve overall and uniform deformation. After selecting various parameters for this treatment, the surface and cross-section microstructure of the heat treatment zone was evaluated by optical microscope (LOM), scanning electron microscope (SEM), transmission electron microscope (TEM), hardness measurement and tensile test, And mechanical properties. The result shows that local high strength can be obtained by local heat treatment. At lower processing temperatures, this effect can be considered bake hardening BH, increasing pre-strain and temperature, thereby improving local performance. As the treatment temperature increases, the initial tissue near the surface is affected. The local reinforcement of DP steels with lasers opens up a new area of application that applies intensification to areas of interest only affecting the area of interest, thus providing the potential for energy savings and the ability to design components.