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程赫明, Cheng Heming a, *, Huang Xieqing b, Xie Jianbin a
C. Heming et al./Journal of Materials Processing Technology 138(2003)399-402,-0001,():
-1年11月30日
The relationships between surface temperature and surface heat-transfer coefficient of different diameter cylinders during quenching have been given. The properties include the coupled effects between phase transformation and temperature, and the coupled effect of the phase transformation between solid and liquid. The comparison of surface heat-transfer coefficients between various diameter cylinders during rapid cooling was taken into account. The results obtained have been shown that the maximum value of the surface heat-transfer coefficient of φ40mm×120mm cylinders is larger than that of φ20mm×60mm.
Surface heat-transfer coefficient, Temperature, Finite-difference method, Quenching
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程赫明, Heming CHENG†, Tianchun HE and Jianbin XIE
J. Mater. Sci. Technol, Vol.18 No.4, 2002 372~374,-0001,():
-1年11月30日
In order to simulate thermal strains, thermal stresses, residual stresses and microstructure of the steel during gas quenching by means of the numerical method, it is necessary to obtain an accurate boundary condition of temperature field, The surface heat transfer coefficient is a key parameter. The explicit finite difference method, nonlinear estimation method and the experimental relation between temperature and time during gas quenching have been used to solve the inverse problem of heat conduction. The relationship between surface temperature and surface heat transfer coefficient of a cylinder has been given. The nonlinear surface heat transfer coefficients include the coupled efFects between martensitic phase transformation and temperature.
45 steel,, Phase transformation,, Heat conduction
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程赫明, 何天淳, 黄协清, 谢建斌
材料热处理学报,2001,22(4):81~84,-0001,():
-1年11月30日
在钢高压气体淬火过程的计算模拟中,关键键问题之一是温度场和应力场边界条件的确定。本文利用显示有限差分法、非线性估计法和由热电偶测试而得到的温度一时间关系,求解热传导方程的逆问题,得出了气体淬火过程表面换热系数与温度间的非线性关系。这种方法具有收敛速度快、不受试件表面加T质量限制,而且利用了热电偶温度检测技术较为成熟稳定的特点。
气体淬火, 温度, 表面换热系数, 有限差分法
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【期刊论文】淬火过程中具有非线性表面系数考虑相变时温度场的有限元分析*
程赫明, 张曙红, 王红刚, 李剑云
应用数学和力学编委会编重庆出版社出版,1998,19(1):16~20,-0001,():
-1年11月30日
温度场的计算对淬火过程中热应力和热应变的分析有较大影响,对淬火后试件的残余应力和微观结构分析也有较大影响。本文以4ZCHMo钢圆柱体试件为研究对象,从相变等温动力学TTT图,给出了连续冷却相变动力学CCT图的数学模拟计算式,计算了钢淬火过程中相变组织成分百分比,将热物性系数处理为温度和相变体积百分比的函数,用有限单元法计算了淬火过程中具有非线性表面系数考虑相变时的温度场,并建立了相应的泛函,为以后计算淬火的热应力和热应变做好准备工作。
有限元法, 淬火, 热传导 相变
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程赫明, 王洪钢, 黄协清
材料科学与工艺,1998,6(2):9~16,-0001,():
-1年11月30日
温度场的计算对淬火过程中热应力和热应变的分析有较大影响,寸淬火后试件的残余应力和微观结构分析也有较大影响。本文以45钢圆柱试件为研究对象,采用文献[2]所得到的非线性表面换热系数,特Norsette法用于有限单元分析中,计算了淬火过程中的非线性温度场,有致地避免了在小时间步长下数值解出现震荡的问题。有限单元法数值解与实验结果吻合较好。
有限元法, 淬火, Norsette法, 温度场
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