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摘要采用Gleeble-1500热模拟实验机对马氏体不锈钢Z12CN13和奥氏体不锈钢Z2CN19-10进行热压缩实验，研究了两种不锈钢热变形过程初始晶粒尺寸、变形温度、变形量、应变速率等变形参数与静态再结晶和流变应力之间的关系。34770
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通过双道次热压缩变形实验，结合加热后水淬的模拟试样的显微组织及不同加热条件试样的变形应力应变曲线，通过线性回归，得到了静态再结晶率模型，并对静态再结晶过程中影响因素做了分析，研究发现：变形温度越高、应变越高、晶粒越细化，静态再结晶越快，进行程度越完全。
通过的热模拟试验和数值模拟，探究热变形下晶粒尺寸，引起的原因和微观机理，建立与变形量、变形温度、保温时间等宏观变形参数之间的关系。研究成果可为核电奥氏体不锈钢大锻件生产中的塑性加工质量预报和控制技术提供可靠的科学依据。
毕业论文关键词：不锈钢；流变应力；静态再结晶
Abstract
Hot compression tests of both martensitic stainless steel Z12CN13, and austenitic stainless steelZ2CN19-10 performed on Gleeble-1500 thermo-mechanical simulator to study the influence of deformation conditions, such as initial grain size, temperature, strain, and strain rate on the static recrystallization and flow stress curves.
On the basis of double-pass hot compression deformation test, combing with quenched sample microstructure and flow stress curves in different deformation conditions, the static recrystallization model is obtained through linear regression. After analyzing factors in the static recrystallization process, the results showed that the higher the deformation temperature, the higher the strain, the more refined the grain size.
Through the thermal simulation experiments and numerical simulations to explore the grain size under hot deformation and established the microstructure. This study established the relationship among strain, deformation temperature, the soaking time and so on between the macroscopic deformation coordinates relations. The research results may provide the reliable scientific basis for the nuclear power stainless steel heavy forging production in plastic processing quality forecast and the control technology.
Keywords: Stainless steel; flow stress curves; static recrystallization
目录
1. 绪论 1
1.1. 引言 1
1.2 锻件两种材料成分配比特征 2
1.2.1 马氏体不锈钢Z12CN13 2
1.2.2 奥氏体不锈钢Z2CN19-10 3
1.3 核件锻造技术研究 5
1.3.1 锻件热变形过程中软化机制 6
1.3.2 锻件热加工过程中晶粒长大 8
1.4 不锈钢锻造的现状与发展 8
1.5 选题背景及意义 9
2 实验材料及方法 11
2.1 实验目的 11
2.2 实验研究内容 11
2.3 实验材料 11
2.4 试验设备 12
2.5 实验方案 13
2.5.1 加热实验 13
2.5.2 双道次高温压缩实验 14
2.5.3 金相显微组织观察 16
3 实验结果与分析 17
3.3 加热实验 17
3.4 双道次高温压缩实验结果及分析 18
3.4.1 变形温度影响 19