【作者】 朱远志； 尹志民； 郭昌明； 滕浩；

【Author】 Zhu Yuanzhi Yin Zhimin Guo Changming Teng Hao ( School of material science and engineering, Central SouthUniversity,Changsha , 410083) ( The 70th researching institute of Chinese armory group, Datong,037036)

【机构】 中南大学材料学院； 中国兵工集团第70研究所；

【摘要】 利用Gleeble1500热模拟、金相技术研究了6Cr21Mn10MoVNbN奥氏体不锈钢的高温流变特性。研究发现,合金的高温变形分为加工硬化阶段和稳态变形阶段。合金的流变应力随温度升高而下降;合金在950-1050℃之间变形既能保证较低的力能消耗,又可以保证良好的微观组织。在面心立方材料的Zerrilli-Armstrong本构方程基础上,引入材料微观结构变化参量,得到了一个形式简单的适于材料动态计算的本构方程,并分不同温度段计算了表征合金微观结构变化的相关参数,对合金的流变应力进行了预测,预测结果和实验数据吻合良好。更多还原

【Abstract】 6Cr21Mn10MoVNbN steel is a new material used for heavy duty engine. It is necessary to make investigation of the deformation behavior of this alloy at elevated temperature. Thermal simulator and metallography have been used to research the behavior of this alloy. Researching results show that the deformation process of this alloy includes two stages, working hardening and constant stress deforming.At the first stage, the flow stress increases with increasing of the strain, at the second stage, the flow stress of the alloy maintains almost constant. At the same time, the flow stress decreases rapidly with increasing of the temperature. Low flow stress and good microstructure can be obtained at a deformingtemperature between 950 - 1050℃. Finally by introduction of an internal variable parameter, a constitutive equation has been brought out for dynamical calculation based on Zerrilli-Armstrong equationused for f. c. c materials. Predictions of flow stress of this alloy by the new constitutive equation show a good agreement with experimental data.更多还原