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本文通过拉伸试验研究了 GCr15轴承钢经双细化处理后的超塑效应;在温度 T=700℃,应变速率■=1×10~(-2)min~(-1)条件下,其延伸率δ=630%,流动应力σ=4kg/mm~2,应变速率敏感性指数 m=0.42;其超塑性能优于两次循环淬火处理的 GCr15轴承钢,这表明超细化的第二相起着重要作用。本文还通过拉伸和压缩试验研究了应力状态对超塑效应的影响:在T=660℃时,最佳超塑状态的应变速率■=2.67×10~(-2)min~(-1)。这表明随着静水压力的增加,变形速度有较大的提高,有利于超塑性技术在实际中的应用。
In this paper, the superplastic effect of GCr15 bearing steel after double refining treatment was studied by tensile test. Under the conditions of T = 700 ℃, strain rate = 1 × 10 ~ (-2) min ~ (-1) The elongation δ = 630%, the flow stress σ = 4kg / mm ~ 2, the strain rate sensitivity index m = 0.42; its superplasticity is better than the GCr15 bearing steel with two cycles quenching, which shows that the superfine second Play an important role. In this paper, the effect of stress state on the superplastic effect was also studied by tensile test and compression test. The strain rate of the best superplastic state at T = 660 ℃ is 2.67 × 10 ~ (-2) min ~ (-1) . This shows that with the increase of hydrostatic pressure, the deformation rate is greatly improved, which is in favor of superplasticity technology in practice.