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摘要
The constitutive relationship of 4Cr9Si2 martensite refractory steel was obtained by isothermal compression, and the forming process of 4Cr9Si2 martensite refractory steel by cross-wedge rolling was simulated by means of DEFORM-3D software. The influence regularities of necking and internal defeats of process parameter were obtained. Rolling experiments were carried out to verify the correctness of the FEM simulation, and metallographic microstructure of rolled alloy was analyzed. The results show that with the increase of forming angel, decreasing transverse maximum stress and its duration time is accompanied by axial metal flow with a greater value than that of transverse metal flow and consequently lower the possibility of internal defects. Also, the value and duration time of transverse stress can be reduced by increasing stretching angle and thus lead to the lower possibility of internal defects. Besides, the decreasing forming angel and increasing stretching angel are associated with the reduced axis force Fz and as a result the probability of phenomenon about necking can be improved. The size of original austenitic grain is 11 μm in the central part of cross-section and the microstructure of valve is improved.
- 出版日期2013
- 单位北京科技大学
