锻压技术

汽车覆盖件冷冲压模具激光熔覆强化技术

英文标题：Laser cladding strengthening technology of cold stamping dies for automobile panel

作者：许玲萍刘希豪邵东强朱义

单位：（1.烟台职业学院机械工程系山东烟台 264067 2.山东泰利先进制造研究院有限公司山东烟台 264000）

分类号：TG455

出版年,卷(期):页码：2019,44(2):135-140

摘要：

采用不同的工艺参数，在45钢板表面制备出零缺陷的铁基熔覆层；采用金相显微镜对熔覆层横截面、熔合面以及热影响区的组织进行检测，采用维氏硬度计进行了熔覆层横截面硬度的测定并标绘硬度曲线，以及采用万能试验机测试了熔覆层与45钢板之间的结合强度。结果表明：熔覆层微观组织以柱状晶为主、组织细小致密，熔覆层内部无气孔、裂纹以及夹渣等缺陷；熔覆层硬度呈区域分布，近表面区硬度高于730 HV0.3，近熔合面区硬度高于600 HV0.3；熔覆层与基体结合强度高于锻态45钢的抗拉强度；热影响区的厚度约为600~700 μm。最终，进行了汽车模具表面的激光熔覆强化工业化应用，表明激光熔覆强化汽车模具的可行性和先进性。

The Febased cladding layer without defect was prepared on the surface of 45 steel plate by the different process parameters, and the microstructures of the cladding layer crosssection，fusion face and heat affected zone were examined by metallographic microscope. Furthermore, the hardness of the cladding layer crosssection was measured by Vickers hardness tester, the hardness curve was plotted, and the bonding strength between cladding layer and 45 steel plate was tested by universal testing machine. The results show that the microstructure of the cladding layer is mainly columnar grain with fine and dense microstructure without pores, cracks and slag inclusions in the inner cladding layer, and the hardness of the cladding layer is distributed regionally, namely, the hardness near the surface layer is higher than 730 HV0.3 and the hardness near the fusion face is higher than 600 HV0.3. The bonding strength between the cladding layer and the substrate is higher than that of the forged 45 steel, and the thickness of the heat affected zone is about 600-700 μm. Finally, the industrial application of laser cladding strengthening on the surface of automobile die is carried out, which shows the feasibility and advancement of laser cladding strengthening on automobile die.

基金项目：

基金项目:山东省自主创新专项项目（2013CXH40401）

作者简介：许玲萍（1965-），女，硕士，副教授 Email：zyxy_00@163.com

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