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目前的TRIP钢由于Mn、Si含量较低,室温条件下仅保留约10%的残余奥氏体,结果使变形过程中材料产生的相变诱发塑性量有限,不能满足一些要求产生更大相变诱发塑性场合的需要。研究表明:提高钢中Mn、Si含量并辅以适量其它合金元素(如铬和镍)是提高材料相变诱发塑性的有效途径。研究了Fe-17Mn-5Si-10Cr-4Ni合金在不同应变速率下的变形特性,结果表明:该合金经1 100℃×1 h正火处理后具有单相奥氏体组织,在1.1×10-4~5.5×10-2s-1的应变速率内对其进行变形,真应力随真应变的增加而线性增大,且应力的增加与变形速率基本无关。变形速率为1.1×10-2s-1时,材料的抗拉强度为750 MPa,伸长率为49%。该合金在拉伸变形过程中产生如此大变形量的主要原因是发生了奥氏体→-εM相变,应变速率增加,材料的相变诱发塑性量变化不大,但材料中的-εM量却逐渐减少。
Due to the low content of Mn and Si in TRIP steels, only about 10% retained austenite is retained at room temperature. As a result, the phase transition induced plasticity of the material during the deformation process is limited and some of the requirements can not be met to produce larger phase transitions The need to induce plasticity. The results show that increasing the content of Mn and Si in steel and adding some other alloying elements (such as chromium and nickel) is an effective way to improve the phase transition induced plasticity. The deformation characteristics of Fe-17Mn-5Si-10Cr-4Ni alloy at different strain rates were studied. The results show that the alloy has single-phase austenite after normalizing at 1100 ℃ for 1 h, 4 ~ 5.5 × 10-2s-1 deformation rate of its deformation, true stress increases with the true strain increases linearly, and the increase of stress has nothing to do with the deformation rate. When the deformation rate is 1.1 × 10-2s-1, the tensile strength of the material is 750 MPa and the elongation is 49%. The main reason for the large amount of deformation during the tensile deformation of the alloy is the occurrence of austenite → -εM phase transformation, the strain rate increases, the material phase change induced plasticity little change, but the amount of -εM materials But gradually reduced.