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建立了移动电子束高斯热源作用下的三维相变硬化过程中温度场的数学模型,分析过程中考虑了热源分布、热物性参数、热辐射等因素对温度场的影响,得到了电子束扫描相变硬化温度场的分布规律和硬化层的形态,并进行了实验验证;探讨了电子束工艺参数对硬化区深度和宽度的影响。结果表明:移动电子束高斯热源作用下的温度分布等值线呈勺状,表面最高温度滞后于束流中心,且处理后硬化层横截面呈月牙状;在固态相变条件下,硬化层的宽度和深度随着扫描功率的增加呈非线性增加,随着扫描速度的增加呈非线性减小。
The mathematical model of the temperature field in the process of three-dimensional phase transformation hardening under the action of moving electron beam Gaussian heat source is established. The influence of the heat source distribution, thermophysical parameters and thermal radiation on the temperature field is considered in the analysis. The electron beam scanning phase The distribution law of the hardening temperature field and the shape of the hardened layer, and the experimental verification was carried out. The influence of the parameters of the electron beam on the depth and the width of the hardened zone was also discussed. The results show that the contour of the temperature distribution under the moving electron beam Gaussian heat source is spoon-shaped, the maximum surface temperature lags behind the beam center, and the cross-section of the hardened layer after treatment is crescent-shaped. Under the condition of solid phase transformation, the hardened layer The width and depth increased nonlinearly with the increase of scanning power, and decreased non-linearly with the increase of scanning speed.