淬火高强板矫直过程的残余应力计算模型

为了降低高强板材在生产淬火过程中产生的较大残余应力，所造成板型缺陷和产品性能的下降。本文对Q960E高强钢的矫直过程，进行残余应力数值计算、实验和热力耦合仿真的方法，研究板材在矫直全过程中残余应力的变化。通过淬火热处理后高强板表面形成276.3MPa左右的压应力，内部形成与之反向的拉应力，在矫直过程中，表面塑性变形最大，最终板材表面应力减少到100MPa以下,与实验误差在15%以内，而随着表面层到中心层，塑性变形的递减，心部残余应力一直保持为200MPa左右。结果表明：辊式矫直工艺能够有效降低板材残余应力，对表面残余应力影响较大，对心部残余应力影响较小，同时也验证了该计算模型计算残余应力方法的正确性，为降低板材残余应力的矫直工艺提供了有效的计算方法。

Calculation Model of Residual Stress During Quenching and Straightening of High-strength Plate

In order to reduce the large residual stresses generated in the production of high-strength plates during the quenching process, resulting in plate defects and product quality degradation. In this paper, numerical calculations of residual stresses, experiments and thermodynamic coupling simulations are carried out to study the changes of residual stresses during the whole process of straightening of Q960E high-strength steel. After quenching and heat treatment, a compressive stress of about 276.3 MPa is formed on the surface of the high-strength plate, and a tensile stress is formed in the opposite direction. The results show that the roll straightening process can effectively reduce the residual stress of the sheet, which has a greater effect on the surface residual stress and a smaller effect on the core residual stress, and also verifies the correctness of the calculation model for calculating the residual stress, which provides an effective calculation method for the straightening process to reduce the residual stress of the sheet.