Over five-times improved elongation-to-fracture of dual-phase 1180 steel by continuous-bending-under-tension
Over five-times improved elongation-to-fracture of dual-phase 1180 steel by continuous-bending-under-tension
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DOI：
10.1016/j.matdes.2018.11.022
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发表时间：
2019-01
影响因子：
8.4
通讯作者：
C. Poulin;Y. Korkolis;B. Kinsey;M. Knezevic
中科院分区：
文献类型：
--
作者：
C. Poulin;Y. Korkolis;B. Kinsey;M. Knezevic
本文报道了对先进高强度钢(AHSS)双相(DP)1180材料进行连续弯曲拉伸(CBT)工艺以提高其断裂伸长率(ETF)的试验研究的主要结果。这项研究是使用最近开发的测试设备进行的，其中样品以往复方式通过一组三个辊子，同时它被连续拉紧。工艺参数，如滚筒深度，定义了滚筒周围的弯曲和缠绕的量，以及对试件施加拉力的十字头速度，都是为了最大限度地提高材料的ETF。从所记录的力-位移曲线沿轧制方向(RD)、45°和横向(TD)发现，DP 1180的ETF随十字头速度和弯曲深度增加而增大，达到一定程度后又减小。与简单拉伸试验相比，十字头速度为1.35 mm/S、归一化弯曲深度为3.5的最佳参数使材料在每个测试方向的ETF提高了5倍以上。讨论了CBT在保持材料在大塑性应变下的高度完整性方面的作用。
This paper reports the main results from an experimental investigation into the improved elongation-to-fracture (ETF) of the advanced high strength steel (AHSS) dual-phase (DP) 1180 by subjecting the material to the continuous-bending-under-tension (CBT) process. The investigation is carried out using a recently developed testing apparatus, where the specimen flows in a reciprocating fashion through a set of three rollers while it is continuously pulled in tension. The process parameters such as the roller depth defining the amount of bending and wrapping around the rollers and crosshead velocity applying the tensile force to the specimen are varied to maximize the ETF of the material. From the recorded force vs. displacement curves along the rolling direction (RD), 45°, and transverse direction (TD), ETF of DP 1180 is found to improve with the crosshead velocity and with the bending depth up to a certain level, after which it decreases. The optimal parameters of 1.35 mm/s for the crosshead velocity and 3.5 for the normalized bending depth improve ETF of the material over five times in every testing direction relative to simple tension tests. The role of CBT in preserving high integrity of the material to large plastic strains is discussed.