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本文对供应状态的GCr 15轴承钢实现超塑性的工艺作了比较全面的探索。其中就热处理的工艺对细化晶粒的作用;晶粒度、变形温度和速度对超塑性拉伸时延伸率的影响作了系统的试验。试验结果表明,重复二次油淬处理的实用价值最大,它的延伸率已大于500%。金属和合金的超塑性变形温度和速度,在一定范围内是相互影响的。因此GCr 15轴承铜在680～730℃之间和应变速率在1.2×10~(-2)～2×10~(-3)分~(-1)范围内都有较大延伸率的超塑性,其最小延伸率均大于400%,这就为它的采用超塑性成形创造了良好的条件。它在680℃ε=1.2×10~(-2)分~(-1)时最大的应变速率敏感性指数m=0.4。
In this paper, GCr 15 bearing steel supply status of the superplasticity of the technology made a more comprehensive exploration. Among them, the effect of heat treatment process on the grain refinement; the influence of grain size, deformation temperature and velocity on the elongation of superplasticity stretching were systematically tested. The test results show that the repeated secondary oil quenching treatment of the most practical value, its elongation has been greater than 500%. Metals and alloys superplastic deformation temperature and speed, in a certain range of interaction. Therefore, the superplasticity of GCr 15 bearing copper at 680 ~ 730 ℃ and strain rate of 1.2 × 10 -2 ~ 2 × 10 -3 (-1) , The minimum elongation of more than 400%, which for its use of superplastic forming to create a good condition. Its maximum strain rate sensitivity index m = 0.4 at 680 ℃ ε = 1.2 × 10 ~ (-2) min ~ (-1).