摘要
为预测铸件热处理过程中的应力和变形,采用Gleeble热模拟实验机,对单轴应力作用下ZG0Cr13Ni5Mo马氏体相变的相变塑性进行了研究。通过制定不同的加热和加载方案,在试样径向应变中,分离出了相变塑性应变,采用Greenwood-Johnson模型得到了该种材料的相变塑性系数。将所得参数用于三峡水轮机叶片热处理过程的热应力数值模拟,发现叶片热处理变形主要发生在正火过程的冷却阶段,在回火过程中产生的变形很小。研究表明:相变塑性是铸件热处理过程应力和变形的重要影响因素。
The Martensitic transformation plasticity of ZG0Cr13Ni5Mo stainless steel under uniaxial loading was investigated on a Gleeble thermal simulator to predict the stress and deformation of castings during heat treatment. The transformation plasticity strains were separated from the radial strains in the specimens by various heating and loading schemes. The Greenwood-Johnson model was used to evaluate the transformation plasticity. This measured transformation plasticity was then used in a numerical simulation of the stresses in a hydro turbine blade for the Three Gorges Project during heat treatment. The simulations show that the deformation during heat treatment mainly occurs during the cooling part of normalizing treatment, with the deformation generated in the following two tempering processes being quite small. Transformation induced plasticity is one of key factors causing stresses and deformation of castings during heat treatment.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2010年第8期1183-1187,1192,共6页
Journal of Tsinghua University(Science and Technology)
基金
国家"十一五"科技支撑计划项目(2007BAF02B07
2007BAF02B02)
关键词
相变塑性
马氏体相变
水轮机叶片
变形
transformation plasticity
Martensitic transformation
hydraulic turbine blade
deformation
