Modelling of phase transformations induced by thermo-mechanical loads considering stress-strain effects in hard milling of AISI H13 steel
Modelling of phase transformations induced by thermo-mechanical loads considering stress-strain effects in hard milling of AISI H13 steel
复制标题
考虑 AISI H13 钢硬铣削中的应力应变效应，对热机械载荷引起的相变进行建模
DOI：
10.1016/j.ijmecsci.2018.10.010
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发表时间：
2018
影响因子：
7.3
通讯作者：
J. Zhang
中科院分区：
文献类型：
--
作者：
B.X. Li;S. Zhang;Q. Zhang;J. Chen;J. Zhang
难加工材料的硬铣削已成为热锻和模具制造行业中流行的制造技术。钢在硬态铣削过程中，在强烈的热力耦合作用下会发生局部相变。这项工作的重点是预测相变在硬铣削AISI H13钢。首先，基于相变动力学，提出并描述了一个考虑应力-应变效应的快速热相变模型。其次，所提出的模型被实施到一个有效的有限元模型（FEM）作为一个用户子程序Abaqus/显式描述在硬铣削AISI H13钢切屑形成过程中的相变。预测结果表明，在切屑背面马氏体转变为奥氏体，而在加工表面没有产生奥氏体。当切削速度从200 m/min增加到400 m/min时，不同区域中奥氏体的体积分数都有所增加。最后，通过与实验数据的比较，验证了所提出的金属-热力耦合有限元模型的正确性。取得了良好的协议，表明所提出的模型可以用于预测AISI H13钢硬铣削过程中的相变。实验和预测结果有助于加深对AISI H13钢硬态铣削过程中相变和组织演变机制的理解。本研究也有助于优化加工参数，以获得所需的表面完整性在硬铣削AISI H13钢。
Hard milling of difficult-to-machine materials has emerged as a popular manufacturing technology in the hot forging and mould manufacturing industries. Local phase transformation of steels often occurs under deeply coupled thermomechanical effects during the hard milling process. This work focuses on the prediction of phase transformations in hard milling of AISI H13 steel. First, a rapid heat phase transformation model that considers stress-strain effects is proposed and described based on phase transformation kinetics. Second, the proposed model is implemented into a validated finite element model (FEM) as a user subroutine of Abaqus/Explicit to describe phase transformations during chip formation in hard milling of AISI H13 steel. The predicted results indicate that martensite transforms into austenite in the chip back surface while no austenite is produced in the machined surface. The volume fraction of austenite in different zones increases when cutting speed is increased from 200 m/min to 400 m/min. Finally, the proposed metallo-thermomechanical coupled finite element model is verified by comparing the simulated results with experimental data. Good agreement is achieved, demonstrating that the proposed model can be used for prediction of phase transformations during hard milling of AISI H13 steel. The experimental and predicted results help to promote understanding of the phase transformations and microstructure evolution mechanisms of AISI H13 steel in hard milling processes. This study also contributes to optimizing the machining parameters to acquire the desired surface integrity in hard milling of AISI H13 steel.