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利用高真空感应炉熔炼制备高纯 (C +N <10 0× 10 -6)Fe - 14%Cr和Fe - 18%Cr合金。经区域提纯 (HFZ)后获得更高纯 (C +N +O <40× 10 -6)合金 .实验发现区域提纯去除C比去除N ,O ,S更难一些。在加热过程中 ,含碳量越少 ,晶粒开始长大温度越低。合金在 77～ 973K温度区间的拉伸实验结果表明 :纯度增加可以使室温下的塑性增加 ;在 473～ 82 3K温度范围内 ,所有高纯和超高纯样品均出现锯齿状流变 ,在 6 73K下尤为明显 .锯齿状流变的原因可认为是固溶N所产生的动态应变时效造成的 .Fe - 18%Cr合金中锯齿流变产生的名义活化能比低碳钢中的值大得多 ,表明Fe -Cr合金中N原子的扩散由于与Cr原子的相互作用而减慢
High purity (C + N <10 × 10 -6) Fe - 14% Cr and Fe - 18% Cr alloys were prepared by high vacuum induction melting furnace. The higher pure (C + N + O <40 × 10 -6) alloy was obtained after HFZ purification.It was found that the removal of C in the area was more difficult than the removal of N, O, S. In the heating process, the less the carbon content, the lower the temperature at which the grains begin to grow. Tensile test results of the alloy in the temperature range of 77 ~ 973K show that: the plasticity can be increased at room temperature by increasing the purity; all the samples of high purity and ultrahigh purity appear jagged flow in the temperature range of 473 ~ Especially at 73 K. The reason of serrated rheology can be attributed to the dynamic strain aging caused by solid solution N. The nominal activation energy of sawtooth rheology in Fe - 18% Cr alloy is larger than that in mild steel Show that the diffusion of N atoms in Fe-Cr alloy slows down due to the interaction with Cr atoms