文档介绍：学号:100006060111
Xingtai Polytechnic College
毕业论文
GRADUATE DESIGN
论文题目:高线轧制工艺参数对晶粒尺寸的影响
学生姓名:潘*硕
专业班级:材料101
院系:资源与环境工程系
指导教师:果晶晶刘臧者
2013年6月13日
目录
摘要 1
ABSTRACT 2
引言 3
1 高线终轧后控冷工艺试验条件的确定 4
控冷工艺参数的选择 4
正交试验 4
2 试验结果的分析讨论 6
力学性能指标分析 6
直观分析结果 6
方差分析结果 6
金相组织检验及分析 8
3 轧制工艺参数对晶粒尺寸的影响 10
现场简介及实验钢的化学成分 10
奥氏体晶粒尺寸演变规律 10
轧制参数的改变对奥氏体晶粒尺寸的影响 12
改变终轧温度 12
改变轧制速度 13
结论 14
参考文献 16
摘要
利用热模拟机GLeeble-1500对f9mm高碳钢线材吐丝后控制冷却过程模拟,研究控冷工艺参数的变化对高碳钢线材组织性能的影响,得到试验条件下最佳的控冷工艺制度,为生产高质量的制品原料提供有价值的理论参考。以及结合高碳钢线材的生产实际,利用物理冶金理论和实验模型,对奥氏体的变形-再结晶过程进行模拟计算,计算出各道次的奥氏体晶粒尺寸并分析变化规律。模拟计算结果表明,亚动态再结晶在粗轧和中轧阶段起主要作用,在轧制后半程,静态再结晶起主要作用。分析改变生产工艺参数对晶粒尺寸的影响以及晶粒细化的途径。为进一步的相变、性能预测提供指导依据。
关键词: 高速线材; 控制冷却;组织;轧制参数;晶粒尺寸
ABSTRACT
The controlled cooling process of f9mm high-carbon steel wire rods after laying out is simulated with Gleeble-1500 type hot simulation experiment machine and the effects of the fluctuation of controlled cooling parameters on microstructure and mechanical properties of high-carbon steel wire rods are studied. The optimum controlled cooling procedure according to condition of the experiment is found. It will give a valuable theoretical reference to produce high quality raw materials for steel wire products. And the austenite deformation-recrystallization process during high-speed rolling of the high carbon steel wire have been simulated and calculated, and the austenite grain size of the rolling stock and the law of its variation pass-by-pass calculated by application of the physical metallurgy theory and experimental model. The results indicate that meta-dynamic recrystallization (MRX) is the dominant microstructure process in rough andintermediate passes, and static recrystallization (SRX) is the dominant one in later passes. And effects of change of process parameters on austenite grain size and approach to refinement of the austenite grain size is analyzed. It provides the guiding principle for prediction of