通过Gleeble-1500热模拟试验机进行铸态V-5Cr-5Ti合金的高温压缩和拉伸试验,研究压缩过程中变形温度对合金临界变形量和临界变形抗力的影响和在拉伸过程中变形温度对合金屈服强度和断面收缩率的影响规律,并用金相显微镜分析了合金的压缩变形组织.结果表明:V-SCr-5Ti合金的热加工变形抗力大、塑性低,欲改善其加工性能,加热温度的选择及控制尤为重要.合金的加工温度应严格控制在1150～1250℃,变形量控制在30%以内,才能得到满足要求的合金.
By means of hot compression and tension test on a Gleeble-1500 equipment for the as-forged V-5Cr-5Ti alloys, the effect of the deformation temperature on the critical deformation and critical deformation resistance in the compression process were studied, its effect on the yield strength and percentage reduction of area in the tension process were also studied. The deformation microstructure of hot compression specimen was analyzed by OM. Results show that the V-5Cr-5Ti alloys have high deformation resistance and low plasticity. In order to improve the hot workability, the hot-working temperature range must be strictly selected and controlled. The optimum hot-working temperature range of V-5Cr-5Ti alloys should be 1150-1250 ℃, and the deformation amount should be below 30% to get satisfactory alloys.
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