碳含量对新型Fe-Ni-Mn-Si-C系TWIP钢组织和力学性能的影响

来源期刊：钢铁2010年第6期

论文作者：温鸿英 朱定一 王明杰 乔卫 廖琳

文章页码：74 - 78

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

Key words：twinning induced plasticity(TWIP) steel； mechanical twin； mechanical property； strain hardening； dynamic strain aging

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。

Abstract: 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 391 MPa to 458 MPa,tensile strength increases from 860 MPa to 974 MPa,and elongation increases from 63.6% to 69.2%.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%.

基金信息：国家自然科学基金资助项目
福建省自然科学基金资助项目