冷变形对0Cr25Ni35AlTi组织与力学行为的影响  

Effect of cold deformation on microstructure and mechanical behavior of 0Cr25Ni35AlTi

作　　者：邓红星[1,2] 郑文杰[2] 宋志刚[2] 岑启宏[1] 丰涵[2] 

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]钢铁研究总院特殊钢研究所,北京100081

出　　处：《钢铁研究学报》2015年第6期67-72,共6页Journal of Iron and Steel Research

摘　　要：采用室温拉伸和硬度测试研究了不同冷变形量对0Cr25Ni35AlTi室温力学性能和硬度的影响。通过OM、TEM对冷变形后的组织进行观察,分析不同冷变形后力学性能的变化机制。结果表明,随着变形量的增加,合金的抗拉强度、屈服强度和硬度增加。当变形量为20%时,合金的屈服强度提高了1.5倍,抗拉强度提高了1.2倍,分别达到了679和762 MPa。合金加工硬化指数随着冷变形量的增加而减小。在10%和15%形变量之间存在一个临界值,小于临界值时,位错运动主要是单滑移,真应力-真应变曲线可用Ludwigson模型描述;大于临界变形量,位错运动出现了多滑移和交滑移,真应力-真应变曲线可以用Hollomon方程描述。Tests of tensile and hardness were employed to investigate effect of cold deformation on tensile properties and hardness of 0Cr25Ni35 AlTi alloy at room temperature.Observation of microstructures after cold deformation was carried out by OM and TEM to illustrate the mechanisms for changes of mechanical properties of0Cr25Ni35 AlTi alloy after different cold rolling deformations.The results show that with the increase of deformation,tensile strength,yield strength and hardness rise.When deformation reaches to 20%,yield strength and tensile strength increase by about 1.5and 1.2times and reach to 679 and 762 MPa,respectively.Working-hardening exponent reduces with the increase of cold deformation.There is a critical strain between deformations of10% and 15%.When strain is below the critical strain,dislocation movement is mainly single slip and Ludwigson model can be used to describe true stress-strain curve,while when strain is above the critical strain,multi-slip and cross-slip of dislocation occur and Hollomon model can be used to describe true stress-strain curve.

关 键 词：0Cr25Ni35AlTi 冷变形 组织 力学性能 Ludwigson模型 

分 类 号：TG142.71[一般工业技术—材料科学与工程]