论文部分内容阅读
提出了形变诱导马氏体相变实现304不锈钢超塑性的构想,研究了利用形变诱导马氏体相变循环实现超塑性的方法。结果表明,304不锈钢通过室温形变可诱导马氏体相变,随后时效时马氏体发生逆相变且伴随产生回复应力,从而间接达到了相变超塑性的实现条件。采用室温拉伸30%后在973~1273 K时效20 min,相变循环2次,该钢可实现相变超塑性,总伸长率随时效温度的增加先增加后下降,1123 K达到最大值177%;在室温拉伸30%后1073K时效30 min时,随相变循环次数增加,总伸长率增加,相变循环7次后达到764%。随相变循环次数增加,晶粒明显细化、均匀化。
The conception of realizing superplasticity of 304 stainless steel by deformation-induced martensitic transformation was put forward. The method of utilizing superconductivity by deformation-induced martensitic transformation was studied. The results show that martensitic transformation of 304 stainless steel can be induced by room temperature deformation, and martensite undergoes retrophase transformation accompanied by generation of recovery stress, which indirectly leads to the realization of phase transition superplasticity. The phase transition superplasticity can be achieved by using 30% elongation at room temperature for 20 min at 973 ~ 1273 K and 2 cycles of phase transformation. The total elongation increases first and then decreases with the increase of aging temperature and reaches the maximum at 1123 K 177%. After stretching 30% at room temperature for 10 min, the total elongation increased with the number of phase transition cycles, and reached 764% after 7 cycles. With the increase of the number of phase transition cycles, the grains are obviously refined and homogenized.