45钢激光束扫描数值模拟与组织性能

发布时间：2018-06-14 00:40

本文选题：钢 + 激光相变硬化　；参考：《材料热处理学报》2017年03期

【摘要】：利用有限元软件ANSYS对激光束扫描试样的温度场进行数值模拟,研究其温度分布规律。研究激光束扫描对试样显微组织和性能的影响,探讨激光功率和扫描速度等工艺参数对相变硬化层组织性能的影响。采用光学显微镜分析45钢激光相变硬化区的显微组织,用显微硬度计进行硬度测量。结果表明:45钢经激光束扫描后,硬化层的显微组织为针状或板条状的马氏体,组织更加均匀、细小,试样表面硬度最高可达57.5 HRC,相比调质处理提高约1倍,激光扫描区域组织沿深度方向上成梯度分布规律,从表层往深度方向依次为相变硬化区、过渡区和基体。激光工艺参数对硬化层显微组织和性能有较大的影响,相变硬化层的深度和宽度随着激光功率的增加而增加,随着扫描速度的增加而减小;硬化层的截面硬度随着激光功率和扫描速度的增加呈现先增加后减小的变化规律。
[Abstract]:The temperature field of laser beam scanning sample was simulated by finite element software ANSYS, and the temperature distribution was studied. The effect of laser beam scanning on the microstructure and properties of the samples was studied. The effects of laser power and scanning speed on the microstructure and properties of the phase transformation hardening layer were discussed. The microstructure of laser transformation hardening zone of 45 steel was analyzed by optical microscope, and the hardness was measured by microhardness meter. The results show that the microstructure of the hardened layer is needle or strip martensite after laser beam scanning, and the microstructure is more uniform and fine. The surface hardness of the specimen is up to 57.5 HRC, which is about 1 times higher than that of the tempering treatment. The microstructures in the laser scanning region have gradient distribution along the depth direction, and the order from the surface to the depth is the phase transformation hardening region, the transition zone and the matrix. The laser process parameters have great influence on the microstructure and properties of the hardened layer. The depth and width of the phase transformation hardening layer increase with the increase of laser power and decrease with the increase of scanning speed. The cross section hardness of the hardened layer increases first and then decreases with the increase of laser power and scanning speed.
【作者单位】：江西理工大学机电工程学院;
【基金】：江西理工大学校级学术学位研究生创新专项资金(XS201503)
【分类号】：TG142.1

【相似文献】