Yuan Yasha, Lin Yichou, Wang Wenyan, Zhang Bo, Shi Ruxing, Zhang Yudong, Xie Jingpei, Wu Chuan, Mao Feng
School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China.
Luo Yang CITIC HIC Casting and Forging Co., Ltd., Luoyang 471039, China.
Materials (Basel). 2024 Dec 12;17(24):6071. doi: 10.3390/ma17246071.
In response to the increasingly strict performance requirements of large molds, a novel Cr-Mo-V hot-work die steel has been developed. In order to study the high-temperature hot deformation behavior and plasticity of the novel steel, hot compression tests were conducted on the Gleeble-1500D thermal simulation testing machine at a deformation temperature of 9501200 °C and a strain rate of 0.0015 s. Based on the Arrhenius constitutive model, a novel Cr-Mo-V steel high-temperature constitutive model considering strain was established. The reliability and applicability of this modified model, which includes strain compensation, were assessed using the phase relationship coefficient (R) and the average absolute relative error (AARE). The values of R and AARE for comparing predicted outcomes with experimental data were 0.98902 and 3.21%, respectively, indicating that the model demonstrated high precision and reliability. Based on the Prasad criterion, a 3D hot processing map of the novel Cr-Mo-V steel was established, and the instability zone of the material was determined through the hot processing map: the deformation temperature (9501050 °C) and strain rate (0.0010.01 s) were prone to adiabatic shear and crystal mixing. The suitable processing range was determined based on the hot processing map: The first suitable processing area was the strain range of 0.050.35, the temperature range was 11001175 °C, and the strain rate was 0.0010.009 s. The second suitable processing area was a strain of 0.450.65, a temperature of 11001200 °C, and a strain rate of 0.00240.33 s. Finally, the forging process of hundred-ton die steel forging was developed by combining 3D hot processing maps with finite element simulation, and the forging trial production of 183 t forging was carried out. The good forging quality indicated that the established hot processing map had a good guiding effect on the production of 100-ton test steel forging.
针对大型模具日益严格的性能要求，开发了一种新型Cr-Mo-V热作模具钢。为了研究该新型钢的高温热变形行为和塑性，在Gleeble-1500D热模拟试验机上进行了热压缩试验，变形温度为9501200℃，应变速率为0.0015s⁻¹。基于Arrhenius本构模型，建立了一种考虑应变的新型Cr-Mo-V钢高温本构模型。使用相位关系系数（R）和平均绝对相对误差（AARE）评估了这种包含应变补偿的修正模型的可靠性和适用性。将预测结果与实验数据进行比较，R值和AARE值分别为0.98902和3.21%，表明该模型具有高精度和可靠性。基于Prasad准则，建立了新型Cr-Mo-V钢的三维热加工图，并通过热加工图确定了材料的失稳区：变形温度（9501050℃）和应变速率（0.0010.01s⁻¹）容易发生绝热剪切和晶体混合。根据热加工图确定了合适的加工范围：第一个合适的加工区域是应变范围为0.050.35，温度范围为11001175℃，应变速率为0.0010.009s⁻¹。第二个合适的加工区域是应变0.450.65，温度11001200℃，应变速率0.00240.33s⁻¹。最后，通过将三维热加工图与有限元模拟相结合，制定了百吨级模具钢锻件的锻造工艺，并进行了183t锻件的锻造试生产。良好的锻造质量表明所建立的热加工图对百吨级试验钢锻件的生产具有良好的指导作用。
