喷射成形W9高速钢热变形特性及微观组织变化
Characteristics of Hot Compression Deformation and Microstructure Evolution of Spray Formed W9 High Speed Steels
周 瑞1, 薛国华2
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作者单位：1. 江苏科技大学 冶金与材料工程学院, 江苏 张家港 215600; 2. 哈尔滨工业大学 材料科学与工程学院, 黑龙江 哈尔滨150001)
中文关键字：喷射成形； 高速钢； 热变形
英文关键字：spray forming; high-speed steel; hot deformation
中文摘要：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。
英文摘要：The hot compression test of W9 high speed steels prepared by spray forming were conducted on Gleeble-1500 thermal mechanical simulator at a temperature range of 900 ～1200 ℃ and strain rate range of 0.1～1.0 s-1. The deformation characteristics were investigated by isothermal hot compression testing in order to determine the microstructure evolution of deformed samples. The compression test results show that the compression can reduce the pores existed in alloys. The spray-formed specimen will not crack at 1000 ℃, 0.1 s-1. The stress-strain curves show that the peak stress increases with the decrease of temperature and the increase of strain rate. The workability of spray-formed becomes stable on some compression conditions. When strain rate is fixed, the higher the temperature, the better the deformation of the material. Recrystallization occurs and deformability of spray-formed steel improves when compression temperature is above recrystallization temperature.