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本项研究采用的工艺涉及热轧双相钢(DP)的局部强化效应。为此研究了一种方法能达到局部强化,即局部激光热处理(LHT)。DP簿钢板采用以不同程度的整体和均匀形变进行冷轧,接着激光局部热处理。在这种选择参数的处理后,热处理区域的表面和横截面的显微组织和机械性能都用光学显微镜(LOM)、扫描电镜(TEM)、硬度测量和拉伸试验进行评估。这说明局部热处理能产生局部强化。在较低热处理温度这些效应可归于烘烤硬化(BH)。增加预应变和温度会改善局部性能。随着热处理温度增加,会影响表面附近的起始的组织。DP钢用激光局部强化能开辟一种新的领域,应用局部强化效应只影响有用的相关区域,因此提供了节能和设计零件性能的潜力。
The process used in this study involved the local strengthening effect of hot-rolled dual-phase steel (DP). To this end, a method to achieve local strengthening, that is, local laser heat treatment (LHT). The DP book steel plate is cold-rolled with different degrees of overall and uniform deformation followed by laser local heat treatment. After this selection of parameters, the microstructure and mechanical properties of the surface and cross-section of the heat-treated area were evaluated using optical microscopy (LOM), scanning electron microscopy (TEM), hardness measurement and tensile testing. This shows that local heat treatment can produce local strengthening. These effects are attributable to bake hardening (BH) at lower heat treatment temperatures. Increasing pre-strain and temperature will improve local performance. As the heat treatment temperature increases, the initial tissue near the surface can be affected. Local reinforcement of DP steels with laser light opens up a new area where the application of localized strengthening effects affects only the relevant area of interest, thus offering the potential for energy savings and the design of part performance.