Experimental verification of tailor welded joining partners for hot stamping and analytical modeling of TWBs rheological constitutive in austenitic state
Experimental verification of tailor welded joining partners for hot stamping and analytical modeling of TWBs rheological constitutive in austenitic state
复制标题
用于热冲压的拼焊连接件的实验验证以及奥氏体状态 TWB 流变本构的分析建模
DOI：
10.1016/j.msea.2013.07.059
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发表时间：
2013-11-15
期刊：
影响因子：
6.4
通讯作者：
Xie, Hui
中科院分区：
文献类型：
--
作者：
Tang, Bingtao;Yuan, Zhengjun;Xie, Hui
可淬火超高强度钢的热冲压是目前汽车工业中制造安全和碰撞相关部件的标准成形技术。为了满足环境和安全要求，近年来提出了热冲压拼焊板（twb）技术，以提供具有功能优化和定制力学性能的汽车车身结构件。本文根据淬火硼钢B1500HS在工艺相关条件下的相变和变形行为，确定了合适的配合材料。一般认为，接头接头淬火后的力学性能应满足以下要求。屈服强度YS值应在350 ~ 500mpa之间。极限抗拉强度（UTS）应在500 ~ 650 MPa之间，断裂前总伸长率（TEL）应大于13%。选择B340LA和B410LA两种高强度低合金（HSLA）冷轧钢，验证哪一种适合作为联合伙伴。对不同基材及焊缝进行了显微硬度测定和金相分析。指出B340LA钢具有理想的热学性能和力学性能，是一种合适的接头材料。采用优化后的Arrhenius本构律，改进了基体、接头以及焊缝在奥氏体状态下力学性能的表征和描述。与简化的Hensel-Spittel本构模型的比较表明，优化后的Arrhenius本构律能较好地描述实验数据。爱思唯尔B.V.版权所有
Hot stamping of quenchable ultra high strength steels currently represents a standard forming technology in the automotive industry for the manufacture of safety and crash relevant components. Recently, hot stamping of Tailor-Welded Blanks (TWBs) is proposed to meet the environmental and safety requirements by supplying car structural body components with functionally optimized and tailored mechanical properties. In this paper, an appropriate partner material for the quenchenable boron steel B1500HS based on the phase transformation and deformation behavior under process relevant conditions is determined. It is generally accepted that the mechanical properties for joint partner after quenching process should meet the following requirements. The value of yield strength (YS) should be between 350 and 500 MPa. The ultimate tensile strength (UTS) should be within the limits of 500-650 MPa, and the total elongation (TEL) until rupture should be higher than 13%. Two kinds of High Strength Low Alloy (HSLA) cold rolled steels B340LA and B410LA are chosen for verification of which one is appropriate as joint partner. Microhardness is measured and metallographic is investigated on different base materials and corresponding weld seams. It is pointed out that the B340LA steel is an appropriate joint partner with ideal thermal and mechanical properties. An optimized Arrhenius constitutive law is implemented to improve the characterization and description of the mechanical properties of the base and joint partner, as well as the weld seam in austenitic state. The comparisons with simplified Hensel-Spittel constitutive model show the optimized Arrhenius constitutive law describes the experimental data fairly well. Crown Copyright (C) 2013 Published by Elsevier B.V. All rights reserved.