22MnB5钢表面微观形貌对界面换热系数的影响  

Effect of boron steel 22MnB5 interfacial morphology on interfacial heat transfer coefficient

作　　者：常颖[1,2] 李树娟[2] 唐行辉 李晓东[2] 王存宇[3] 赵坤民[1,2] 

机构地区：[1]大连理工大学工业装备结构分析重点实验室,辽宁大连116024 [2]大连理工大学汽车工程学院,辽宁大连116024 [3]钢铁研究总院特殊钢研究所,北京100081

出　　处：《材料热处理学报》2015年第3期226-231,共6页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51101036;51201093;11472072);辽宁省自然科学基金(优秀人才培养;2014028001)

摘　　要：为了探究冲压压强和样件表面粗糙度对22MnB5钢板的界面换热系数(Interfacial heat transfer coefficient,以下简称IHTC)的影响,自主设计了圆台试验模型,利用Beck非线性估算法,求解热成形工艺中高温样件与低温模具间界面换热系数。实验中通过调整冲压压强和改变样件表面粗糙度的方式,进而改变模具与样件间接触表面微观形貌,探究其对IHTC的影响。研究表明:压强与IHTC存在高度近似的正幂函数关系;粗糙度也会对IHTC产生影响,并且当粗糙度大于1μm时,IHTC值会随粗糙度的增大而明显减小,当粗糙度小于1μm时,由于表面氧化皮的影响,IHTC将随粗糙度值的减小而增大放缓,甚至趋于定值而不再增加。In order to explore the effect of stamping pressure and surface roughness on the interface heat transfer coefficient( IHTC) of22 MnB5 blank,round table experimental model was designed. Interfacial heat transfer coefficient between the sample and mold in the hot stamping process was solved by Beck nonlinear estimation method. Effect on IHTC was explored by changing the stamping pressure and the surface roughness to change microstructure between the mold and sample. The results indicate that there is a high degree of approximation of positive power function relationship between pressure and IHTC. Roughness has an impact on IHTC and when the roughness is greater than 1 μm,IHTC value significantly decreases with increasing roughness. When the roughness is less than 1 μm,IHTC can increase slowly with the decreasing roughness for the influence of surface oxide scale,and it even tends to a constant value.

关 键 词：表面微观形貌 界面换热系数(IHTC) Beck非线性估算法 粗糙度 压强 

分 类 号：TG142.1[一般工业技术—材料科学与工程]