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利用Gleeble-1500热力模拟试验机对采用喷射成形技术制备的W9高速钢沉积锭在变形温度900～1200℃、应变速率0.1～1.0 s-1的条件下进行了热压缩试验。利用光学显微镜分析了热压缩后的组织,对变形过程中组织演化进行了研究。结果表明,压缩可减少沉积态试样中存在的孔隙;在所压缩的试样中,1000℃、0.1 s-1时试样表面没有出现裂纹。应力-应变曲线的变化趋势表明,随着变形温度的降低和应变速率的提高,变形时峰值应力提高;同时也发现在某些温度和应变速率下,随着形变发生材料变形能力趋于稳定。应变速率不变时,变形温度的升高使晶粒变形更为充分;当温度高于再结晶温度时,再结晶的发生使材料变形能力得到改善。
The hot compression tests were carried out on the W9 high speed steel deposition ingot prepared by spray forming using the Gleeble-1500 thermal simulator at a deformation temperature of 900-1200 ℃ and a strain rate of 0.1-1.0 s-1. The microstructures after hot compression were analyzed by light microscopy, and the microstructure evolution during deformation was studied. The results show that the compression reduces the porosity in the as-deposited sample. In the compressed sample, no cracks appear on the sample surface at 1000 ℃ and 0.1 s-1. The trend of stress-strain curve shows that with the decrease of deformation temperature and the increase of strain rate, the peak stress increases when deformation occurs. It is also found that the deformation ability of material tends to be stable with deformation under some temperature and strain rate. When the strain rate is constant, the deformation temperature increases the grain deformation more fully. When the temperature is higher than the recrystallization temperature, the recrystallization can improve the deformation ability of the material.