22MnB5钢表面微观形貌对界面换热系数的影响

发布时间：2018-11-20 04:09

【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。
[Abstract]:In order to investigate the influence of stamping pressure and sample surface roughness on the interfacial heat transfer coefficient (Interfacial heat transfer coefficient,) of 22MnB5 steel plate, a circular test model was designed, and the Beck nonlinear estimation method was used. The interfacial heat transfer coefficient between high temperature sample and low temperature die is calculated. In the experiment, by adjusting the stamping pressure and changing the surface roughness of the sample, and then changing the micro-morphology of the contact surface between the die and the sample, the influence on IHTC is explored. The results show that there is a highly approximate positive power function relationship between pressure and IHTC. Roughness also affects IHTC, and when the roughness is greater than 1 渭 m, the IHTC value decreases obviously with the increase of roughness. When the roughness is less than 1 渭 m, the IHTC increases with the decrease of roughness due to the influence of surface oxide film. It even tends to be fixed and no longer increases.
【作者单位】：大连理工大学工业装备结构分析重点实验室;大连理工大学汽车工程学院;钢铁研究总院特殊钢研究所;
【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)
【分类号】：TG142.1

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