摘要
基于热机械疲劳试验,采用求解导热逆问题的分析思路,利用迭代法计算综合传热系数,给出5Cr2NiMoVSi高温合金感应加热过程中综合传热系数的计算流程。对试样在循环加热条件下的非稳态温度场进行仿真,对其数据进行分析。结果表明:试样温度随径向位置增加表现出先增加后减小。试样横截面的表面点在热机械疲劳试验前后的晶粒尺寸主要分布在5～30μm范围内,AGS出现了不同程度的降低,降低幅度在5%,可见热机械疲劳试验有助于提高试样的晶粒细化效果和合金材料的疲劳寿命。
Based on the thermal mechanical fatigue test, by adopting the analysis method of solving inverse heat conduction problem, the integrated heat transfer coefficient was calculated by using the iterative method, and then, the comprehensive heat transfer coefficient calculation flow of 5Cr2 NiMoVSi high temperature alloy in the process of induction heating process was provided. The unsteady temperature field of the samples under the condition of cyclic heating was simulated, and the data were analyzed. The results show that the temperature of the sample increases first and then decreases with the increase of radial position.The grain size of sample point on the surface in the cross section before and after the thermal mechanical fatigue test is mainly in the range of 5 μm to 30 μm. And the scope of AGS generates different degrees of reduction, and the reduction range is about 5%, which shows that the thermal mechanical fatigue test can improve the grain refining effect of specimen and fatigue life of alloy materials.
作者
蒋海波
谭平
周志冰
JIANG Haibo;TAN Ping;ZHOU Zhibing(School of Mechanical Engineering,Hunan Mechanical & Electrical Polytechnic,Changsha 410151,China)
出处
《热加工工艺》
CSCD
北大核心
2018年第24期76-78,共3页
Hot Working Technology
关键词
高温合金
热机械疲劳
温度梯度
晶粒尺寸
supper alloy
thermomechanical fatigue
temperature gradient
grain size
