Influence of Temperature and Deformation on Phase Transformation and Vickers Hardness in Tailored Tempering Process: Numerical and Experimental Verifications
Influence of Temperature and Deformation on Phase Transformation and Vickers Hardness in Tailored Tempering Process: Numerical and Experimental Verifications
复制标题
定制回火过程中温度和变形对相变和维氏硬度的影响：数值和实验验证
DOI：
10.1115/1.4027816
复制
发表时间：
2014-10
影响因子：
4
通讯作者：
Bariani P. F.
中科院分区：
文献类型：
--
作者：
Tang B. T.;Wang Q. L.;Bruschi S.;Ghiotti A.;Bariani P. F.
可淬火超高强度钢的热冲压目前代表了用于制造安全和碰撞相关部件的有前途的成形技术。对于某些应用，例如可能经受冲击载荷的B柱，可能期望产生具有更软和更具延展性的微观结构的部件区域。采用分段模具，采用加热筒加热和冷却水循环两种方式，在实验室条件下进行了U形件的热冲压成形。可以得出结论，为了通过引入具有增加的伸长率以改善能量吸收的区域来满足定制的机械性能，最低模具温度应不低于450 °C。光学显微照片被用来验证淬火相相对于加热模具温度的微观结构。对于冷却的模具区域，对于所有感兴趣的模具温度，显微组织主要是马氏体。随着模具加热温度的升高，由于贝氏体体积分数的增加，加热区的维氏硬度降低。开发有限元（FE）模型以捕获实验中观察到的整体硬度趋势。模拟和实验之间的趋势非常相似，维氏硬度的大小存在可接受的差异。对过渡区宽度进行了测量和数值模拟，结果表明，考虑热传导的影响，过渡区宽度与实验值基本一致，均为10 mm。
Hot stamping of quenchenable ultra high strength steels currently represents a promising forming technology for the manufacturing of safety and crash relevant parts. For some applications, such as B-pillars which may undergo impact loading, it may be desirable to create regions of the part with softer and more ductile microstructure. In the article, a laboratory-scale hot stamped U-channel was produced with segmented die, which was heated by cartridge heaters and cooled by chilled water recirculation independently. It can be concluded that in order to satisfy tailored mechanical properties by introducing regions, which have an increased elongation for improved energy absorption, the minimum die temperature should be no less than 450 °C. Optical micrographs were used to verify the microstructure of the as-quenched phases with respect to the heated die temperatures. For the cooled die region, the microstructure was predominantly martensite for all the die temperatures interested. With the increase of heated die temperature, there was a decrease of Vickers hardness in the heated region due to the increasing volume fractions of bainite. The finite element (FE) model was developed to capture the overall hardness trends that were observed in the experiments. The trends between the simulations and experiments were very similar, with acceptable differences in the magnitude of Vickers hardness. The transition widths were measured and simulated and there was a quite good agreement between experiment and simulation with almost the same value of 10 mm by taking heat conduction into account.
登录
查看更多内容
影响因子：
2.2
作者：
Philipp Hein;J. Wilsius
通讯作者：
Philipp Hein;J. Wilsius
影响因子：
4.1
作者：
Mori, K.;Okuda, Y.
通讯作者：
Okuda, Y.
DOI：
10.1016/0001-6160(56)90158-4
发表时间：
1956-01-01
期刊：
ACTA METALLURGICA
影响因子：
--
作者：
CAHN, JW
通讯作者：
CAHN, JW
影响因子：
10.9
作者：
Naderi, Malek;Ketabchi, Mostafa;Bleck, Wolfgang
通讯作者：
Bleck, Wolfgang
DOI：
--
发表时间：
2011
期刊：
--
影响因子：
--
作者：
Olof P. Hedegärd;Martin A. T. Åslund
通讯作者：
Olof P. Hedegärd;Martin A. T. Åslund