热浸渗铝制备Fe-Al合金层温度-应力场有限元分析  

Finite Element Analysis on Temperature-stress Field of the Fe-Al Alloy Layer Prepared by the Hot Dipping Process

作　　者：黄敦伟 侯新瑞[1] 胡爱萍[1] 

机构地区：[1]常州大学机械工程学院,常州213016

出　　处：《表面技术》2013年第6期32-36,共5页Surface Technology

摘　　要：目的分析渗层厚度、加热温度及加热时间对渗层温度场-应力场的影响规律。方法利用ANSYS有限元软件对热浸处理制备Fe-Al合金层进行建模,计算铝的焓值,采用间接耦合法计算渗层应力。结果沿X轴方向,温度变化趋势大体上一致,均表现出上升的趋势,局部出现温度突变现象;渗层最高温度(935.528℃)与加热温度(950℃)相差15℃,温度损失约1.52%;不同厚度下温度的变化趋势均为递减,当厚度为200μm时,温度递减的趋势平稳,未出现峰值;随着渗层厚度的增加,应力值先增加,后减小,而后再增加。结论考虑应力、厚度对渗层性能的影响因素,渗层最佳厚度应为200μm。Objective To analyze the distribution laws of the temperature field and the residual stress field by the thickness, the heating temperature and heating time of the permeability layer. Methods The finite elements software of ANSYS was used to simulate the Fe-A1 alloy layer prepared by the hot dipping process. Enthalpy value of aluminum was calculated, and the permeability layer stress was obtained using the indirect coupling method. Results The tem- perature changes of the alloy layer in the X-axis direction presented a rising trend, with temperature jump phenomenon in some parts. The difference between the highest temperature of the permeability layer （935. 528 ℃ ） and the heating temperature （950 ℃ ） was 15 ℃ , resulting in a temperature loss of about 1.52%. The temperature showed a down- ward trend in alloy layers with different thickness, and when the thickness was 200 μm, the decreasing trend of the temperature became smooth without appearance of peaks. With the increase of the coating thickness, the stress first in- creased and then decreased. Conclusion Considering the effect of the thickness and stress on the properties of the Fe-A1 alloy layer, the optimal thickness should be about 200 μm.

关 键 词：有限元分析 热浸处理 Fe—Al合金层 温度场 应力场 

分 类 号：TG174.445[金属学及工艺—金属表面处理]