热成形中材料热物性参数对Beck反算K_(IHTC)的影响  

Influence of thermal properties on K_(IHTC) in hot forming

作　　者：常颖[1,2] 卢金栋 靳菲[2] 盈亮[2] 王斌[2] 王存宇[3] 赵坤民[1,2] 

机构地区：[1]工业装备结构分析重点实验室(大连理工大学),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：《哈尔滨工业大学学报》2015年第3期97-102,共6页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金(51101036);中央高校基本科研业务基金(DUT12RC(3)100)

摘　　要：为探究22Mn B5钢板热冲区过程中影响换热强度因素、准确求解KIHTC,利用Beck反算法,准确求解热成形22Mn B5高强钢在冲压淬火过程中的界面换热系数KIHTC,并分析了模具和样件热物性参数的改变对KIHTC的影响.研究中利用自制圆台试验模型和自主开发的Beck反算法程序,分别通过选取不同模具材料(45号钢、H13钢)的方式和通过选用淬火过程中有马氏体相变的22Mn B5钢与无相变的AISI-304不锈钢对比的方式来分别研究模具热物性参数的改变和硼钢淬火马氏体相变过程热物性参数的改变对热成形工艺中KIHTC的影响.分析结果表明:22Mn B5钢样件与45号钢模具间的KIHTC要比与H13钢模具间的KIHTC大,其中导热系数的改变对KIHTC的改变起主导作用;马氏体相变的发生,对KIHTC产生正向增益的效果,且增益量约30.2%,同样,相变前后导热系数的差异对KIHTC的改变起主导作用.To study the factors which can influce the thermal properties of both die and specimen, calculate the Interracial Heat Transfer Coefficient（ KIHTC ） during hot stamping process is very important. A round table test and Beck＇s inverse estimation method were used to study the relationship between the thermal properties and the KIHTC . The dies were made of materials with different thermal conductivity and heat capacity. The thermal properties in terms of martensite transformation were obtained by using specimen made of 22MnB5 sheet. Specimen made of stainless steel AISI-304 that does not have martensite transformation during quenching were tested as well for comparison. The results show that the KIHTC between boron steel specimen and die of #45 Steel is larger than that of H13 Steel （approximately twice as much） and the thermal conductivity plays a significant role; the martensite transformation yields a positive gain on KIHTC （approximately by 30.2%） and the change in thermal conductivity before and after phase transformation is a major contributor.

关 键 词：热成形 界面换热系数 Beck反算法 热物性参数 马氏体相变 

分 类 号：TG156[金属学及工艺—热处理]