摘要
端淬实验是研究材料冷却速率与组织性能之间关系的高通量方法,而工件表面综合换热系数则是端淬数值模拟研究的必要边界条件。采用经验公式法、传热反问题法及流-固耦合分析法,计算了CSU-A1型镍基高温合金工件在空气端淬实验中的各表面综合换热系数;结合工件实验温度测点的冷却曲线及平均冷却速率对三种方法进行了比较。结果表明:实验温度范围内工件底端、侧部以及顶端的综合换热系数分别在323~555、16~30、58~184W/(m~2·K)之间。三种方法中,经验公式法获得的冷却曲线误差较大;传热反问题法的冷却曲线误差最小,但对实验数据及其他边界条件的依赖性强;流-固耦合分析法获得的平均冷却速率准确度最高,且不需要通过实验即可获取工件任意位置的换热系数,是研究气体端淬过程表面综合换热系数的有效方法。
The end-quench test is a high through put method to study the relationship between cooling rate and microstructure and properties of the alloy.While the surface synthetic heat transfer coefficients of the specimen are necessary boundary conditions for the numerical simulation of the cooling rate in the end-quench test.To study the surface synthetic heat transfer coefficient of the self-developed CSU-A1 nickel-based superalloy specimen in the end-quench test,the empirical formula method,inverse heat transfer method and fluid-solid coupling analysis method were conducted in this work.The three methods were compared according to the cooling curve and the average cooling rate obtained in the experiment.The result shows that,within the experimental temperature range,the surface synthetic heat transfer coefficients of the specimen at bottom,side and top are 323-555,16-30,58-184 W/(m2·K),respectively.Besides,the error of cooling curve and average cooling rate obtained by the empirical formula is the largest among the three methods,the error of cooling curve obtained by the inverse heat transfer method is the smallest.However,the accuracy of the this method is highly dependent on the experimental data and other boundary conditions.The accuracy of average cooling rate obtained by the fluid-solid coupling analysis method is the highest.Furthermore,the fluid-solid coupling analysis method is able to obtain the surface synthetic heat transfer coefficient at any position of the specimen in any cooling conditions without experiment.It is an efficient method to study the surface synthetic heat transfer coefficient during the end-quench test.
作者
付佩
周萍
赵天阳
陈卓
李超
FU Pei;ZHOU Ping;ZHAO Tian-yang;CHEN Zhuo;LI Chao(School of Energy Science and Engineering,Central South University,Changsha 410083,China;Key Laboratory of Applied Physics-Chemistry,Shaanxi Applied Physics-Chemistry Research Institute,Xi’an 710061,China;State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China)
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2023年第12期4118-4129,共12页
The Chinese Journal of Nonferrous Metals
基金
国家重点研发计划资助项目(2016YFB0700300)
中南大学研究生独立探索创新项目(2019zzts262)。
关键词
端淬实验
表面综合换热系数
流-固耦合分析法
传热反问题法
镍基高温合金
end-quench test
surface synthetic heat transfer coefficient
fluid-solid coupling analysis
inverse heat transfer method
nickel-based superalloy
