具有非线性表面换热系数半圆柱薄壳在快速冷却过程中的热分析  

Thermal Analysis on a Half Cylinder Shell of 42C Rmo Steel With Non-Linear Surface Heat-Transfer Coefficients During Rapid Cooling

作　　者：程赫明[1] 黄协清[2] 方梦霞[1] 谢建斌[1] 

机构地区：[1]昆明理工大学,昆明650093 [2]西安交通大学,西安710049

出　　处：《应用力学学报》2003年第2期103-106,共4页Chinese Journal of Applied Mechanics

基　　金：到国家自然科学基金项目 (批准号 :10 162 0 0 2 );教育部骨干教师计划项目资助

摘　　要：用实验和数值计算相结合的方法 ,得到半圆柱壳体快速冷却过程中内外表面的非线性表面换热系数。在此基础上 ,用有限单元法对半圆柱壳体的热应力和变形进行了分析。在数值计算中 ,模拟钢的CCT图 ,计算了奥氏体、珠光体、贝氏体和马氏体的体积百分比 ,并将热物理性质和力学性能处理为相变体积百分比和温度的函数。所得结果表明 ,在半圆柱壳体快速冷却过程中的热应力和变形计算中 ,有必要考虑非线性表面换热系数。Non linear surface heat transfer coefficient is obtained by experimental and numerical methods and the CCT diagram is simulated by mathematical transformation. The volume fractions of constituent of austenite, perisite, bainte and martensite in continuous cooling are calculated, temperature field with non linear surface heat transfer coefficients is calculated using finite element technique. In numerical calculation, different values of the non linear surface heat transfer coefficients between inner surface and outside surface of the shell are taken account of and the thermal physical properties are treated as the functions of temperature. The experimental results of temperature field coincide with numeral solutions. Finally, the thermal stress is calculated by finite element method.

关 键 词：半圆柱薄壳 快速冷却过程 非线性表面换热系数 有限单元法 热应力 变形 数值计算 淬火 

分 类 号：TG156.3[金属学及工艺—热处理] O551.3[金属学及工艺—金属学]