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在强流脉冲电子束表面改性实验的基础上,通过数值计算方法对β-Cez钛合金的温度场和应力场进行模拟。模拟结果表明:以能量密度为3 J/cm2的单次脉冲处理,样品的最大熔化深度为1.0μm;试样表层(0~2.4μm)为压应力,最大值约2.60 GPa,次表层(2.4~12μm)有大于100 MPa的拉应力,在深度3.2μm处存在最大值,约为500 MPa。实验截面EBSD结果显示,强流脉冲电子束处理β-Cez钛合金有约12μm深的马氏体层。由马氏体相变诱发应力与温度的关系得到马氏体相变最大的触发应力值为2.40 GPa,与准静态最大压应力值2.60 GPa相当,说明马氏体相变源于准静态热应力引发的冲击热应力。由马氏体相变触发应力和深度的分布关系给出应力在β-Cez钛合金中的衰减系数为173 mm-1。
Based on the experiment of surface modification of high-current pulsed electron beam, the temperature field and stress field of β-Cez alloy were simulated by numerical calculation. The simulation results show that the maximum melting depth of the sample is 1.0μm with a single pulse with an energy density of 3 J / cm 2; the compressive stress of the sample surface (0-2.4μm) is about 2.60 GPa; ~ 12μm) has a tensile stress of more than 100 MPa, with a maximum value of 3.2 MPa at a depth of about 500 MPa. The experimental cross-section EBSD results show that the martensite layer of β-Cez alloy with a depth of about 12 μm is treated by high-current pulsed electron beam. The relationship between the stress induced by martensitic transformation and temperature The maximum value of the triggering stress for martensitic transformation is 2.40 GPa, which is equivalent to the maximum quasi-static compressive stress of 2.60 GPa, which indicates that the martensitic transformation originates from the quasi-static thermal stress Induced shock thermal stress. The distribution of the stress and depth distribution triggered by martensitic transformation gives the attenuation coefficient of 173 mm-1 in β-Cez alloy.