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首页> 外文期刊>ISIJ international >Modelling of Flow Stress and Prediction of Workability by Processing Map for Hot Compression of 43CrNi Steel
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Modelling of Flow Stress and Prediction of Workability by Processing Map for Hot Compression of 43CrNi Steel

机译：用43CrNi钢热压缩工艺图建模流动应力和加工性。

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The isothermal hot compression tests of 43CrNi steel was carried out at temperatures 800℃ to 1 050℃ at an interval of 50℃ and at constant strain rates of 0.01, 0.1, 1.0 and 10 s~(-1) for total true strain of 0.7. The values of experimental stress were corrected for adiabatic heating which was used for flow stress modeling, and further its predictability was verified with experimental results. The true stress-true strain curves exhibit peak stresses followed by softening due to occurrence of DRX. The activation energy was calculated based on sinh type equation and found to be increasing with increase in strain. The obtained stress exponent 5.4, suggests that the mechanism of hot deformation is dislocation glide controlled by dislocation climb. Strain rate sensitivity maps and processing maps were developed using dynamic materials model (DMM), modified DMM with different instability criteria. The instability parameter, K_(jt) is directly related to the dissipative function which is associated to microstructural changes, J, whereas the instability parameters, £ and k are associated with the strain rate sensitivity parameter, m. Therefore, the instability parameter, K_j, is more mathematically precise as it eliminates m from its calculations. The microstruc-tures of deformed specimens were studied and correlated with the domains of processing maps to validate the workability region.
机译：43CrNi钢的等温热压缩试验是在800℃至1050℃的温度下以50℃的间隔进行的，并以0.01、0.1、1.0和10 s〜（-1）的恒定应变速率进行，总真实应变为0.7。 。通过绝热加热修正了实验应力的值，该绝热用于流动应力建模，并通过实验结果进一步验证了其可预测性。真实应力-真实应变曲线表现出峰值应力，然后由于发生DRX而软化。根据sinh型方程计算活化能，发现其随着应变的增加而增加。所得应力指数为5.4，表明热变形的机理是位错滑移受位错爬升控制。应变率敏感性图和加工图是使用动态材料模型（DMM），具有不同不稳定性标准的改进型DMM开发的。不稳定参数K_（jt）与与微结构变化J相关的耗散函数直接相关，而不稳定参数£和k与应变率敏感性参数m相关。因此，不稳定参数K_j在数学上更为精确，因为它从计算中消除了m。研究了变形标本的微观结构，并将其与加工图的域相关联，以验证可加工性区域。

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