Liu Ziyuan, Yang Zhao
School of Materials Science and Engineering, Central South University, Changsha 410083, China.
Materials (Basel). 2022 May 11;15(10):3460. doi: 10.3390/ma15103460.
Hot deformation behaviors of an antibacterial 50Cr15MoVCu tool steel were studied. The flow stress curves presented three typical characteristics: (i) a single peak dynamic recrystallization curve, (ii) a monotone incremental work-hardening curve, and (iii) the equilibrium dynamic recovery curve. The flow stress increased with the increase of the deformation rate at each deformation temperature and decreased with the increase of the deformation temperature at the same deformation rate. The thermal activation energy and material constants were Q of 461.6574 kJ/mol, A of 3.42 × 1017, and α of 0.00681 MPa−1, respectively. The high temperature constitutive equation was: Z=ε˙expQ/RT=3.42 × 1017sinh0.0068 × σ5.6807. Based on the processing maps and microstructure evolution, the best hot working process was a deformation temperature of 1050 °C and deformation rate of 0.001 s−1.
研究了一种抗菌50Cr15MoVCu工具钢的热变形行为。流变应力曲线呈现出三个典型特征：(i) 单峰动态再结晶曲线，(ii) 单调递增加工硬化曲线，以及(iii) 平衡动态回复曲线。在每个变形温度下，流变应力随变形速率的增加而增大，在相同变形速率下，流变应力随变形温度的升高而降低。热激活能和材料常数分别为Q = 461.6574 kJ/mol、A = 3.42×1017和α = 0.00681 MPa−1。高温本构方程为：Z =ε˙exp(Q/RT)= 3.42×1017 sinh(0.0068×σ5.6807)。基于加工图和微观组织演变，最佳热加工工艺为变形温度1050 °C、变形速率0.001 s−1。
