摘要
根据强流脉冲电子束表面重熔的特点,采用ANSYS有限元软件中的直接热力耦合方法,建立了40Cr钢热力耦合有限元模型,对电子束照射靶材过程的温度场和热应力场进行了模拟分析。结果表明,经电子束照射后靶材表面在0.5μs时熔化,在1μs时温度达到最高值1 960℃;照射之初,材料表层受热膨胀,承受压应力,降温凝固时,表层收缩受拉,最后表层9μm深度范围分布有550 MPa的残余拉应力;次表层分布有幅值较小的压应力,随深度的增加而逐渐趋于零;多次照射材料表层热应力分布变化较小。
In view of the characters of high-current pulsed electron beam surface remelting,a finite element model was established by using the direct thermal-mechanical coupling method to analyze the temperature and thermal stress field in 40Cr steel.The results show that the surface layer began to melt at the time 0.5μs and it reached the maximum value 1 960 ℃ at 1μs.Compressive stresses acted in the surface layer at the previous stage of irradiation,as the surface was cooled,the tensile stresses about 550 MPa was formed in the surface layer whose thickness is 9μm.The compressive stresses of the smaller magnitude was formed in the near-surface layer and it decreased to zero gradually with the depth increasing.There was small change of the thermal stress between several irradiations and only once.
出处
《重庆理工大学学报（自然科学）》
CAS
2011年第3期19-23,共5页
Journal of Chongqing University of Technology：Natural Science
基金
国家自然科学基金资助项目(50775229)
重庆市自然科学基金资助项目(20083014)
关键词
强流脉冲电子束
表面改性
有限元模拟
温度场
热应力场
high-current pulsed electron beam
surface modification
finite element method
temperature field
thermal stress field
