碳含量对新型Fe-Ni-Mn-Si-C系TWIP钢组织和力学性能的影响  

Effect of Carbon Content on Microstructure and Mechanical Properties of New Fe-Ni-Mn-Si-C TWIP Steel

作　　者：温鸿英[1] 朱定一[1] 王明杰[2] 乔卫[1] 廖琳[1] 

机构地区：[1]福州大学材料科学与工程学院,福建福州350108 [2]福建工程学院,福建福州350108

出　　处：《钢铁》2010年第6期74-78,共5页Iron and Steel

基　　金：国家自然科学基金资助项目(50471007);福建省自然科学基金资助项目(E0710006)

摘　　要：通过光学显微镜、X射线衍射和透射电镜等方法研究了碳含量对Fe-Ni-Mn-Si-C系合金微观组织和力学性能的影响。结果表明:Fe-Ni-Mn-Si-C系合金的主要塑性变形机制为孪生诱发塑性(TWIP)效应。碳的质量分数由0.70%增加至0.98%,合金的屈服强度和抗拉强度分别由391 MPa和860 MPa增大到458 MPa和974 MPa,伸长率由63.6%提高到69.2%。随着碳含量的提高,Fe-Ni-Mn-Si-C系合金出现明显的动态应变时效现象。Fe-15Ni-12Mn-2.5Si-XC合金具有良好的应变硬化能力,随着碳的质量分数提高至0.98%,最大应变硬化指数达到0.73。The microstructures and tensile properties of three high carbon Fe-Ni-Mn-Si-C steels were investigated by optical microscope, X-ray diffraction and TEM. The results show that twinning induced plasticity effect is the main plasticity mechanism of the Fe-Ni-Mn-Si-C steels. With the increasing of carbon content, yield strength increases from 391MPa to 458MPa, tensile strength increases from 860MPa to 974MPa, and elongation increases from 63.6% to 69.2%o. The dynamic strain aging becomes more obvious with the increasing of the carbon content. Fe-15Ni-12Mn 2.5Si-XC steels have high strain hardening capacity, and the maximal strain hardening exponent of the steels can reach up to 0.73 when the carbon content increases to 0.98%.

关 键 词：孪生诱发塑性钢 形变孪晶 力学性能 应变硬化 动态应变时效 

分 类 号：TG142.1[一般工业技术—材料科学与工程]