40Cr冷滚打成形中位错密度变化研究

Study on Dislocation Density Change during Cold Roll-beating of 40Cr

为揭示40Cr在高速冷滚打中的成形机理,将40Cr宏观应力变化和位错密度变化机理相结合,得到了40Cr位错密度变化曲线;基于位错密度变化的微观组织演变模型,建立了40Cr位错密度变化模型,并验证了该模型的正确性;利用XRD实验得到40Cr在不同变形条件下的XRD图谱,结合Dunn公式求得40Cr在不同变形条件下各个晶面及晶面整体位错密度变化。通过模型验证和试验分析,进一步从微观角度解释了40Cr在冷滚打成形过程中的变化规律。

In order to discover the forming mechanism of 40Cr in a cold roll--beating process, the 40Cr macro stress was combined with the dislocation density change mechanism and the 40Cr disloca- tion density curves were obtained. Based on the evolution model of micro structure about dislocation density,a change model of the 40Cr was established and the accuracy of the model was verified. XRD was applied to measure spectrums in the different deformation conditions, combined with the Dunn formula obtained from 40Cr various crystal surfaces and the crystal surface as a whole dislocation den- sity changes under different deformation conditions. By the model validation and test analysis, the change rules of 40Cr will be further explained from the microscopic view.