锻压技术

690合金铸锭和锻件的镦粗过程数值模拟

英文标题：umerical simulation of upsetting process for alloy 690 cast ingot and forged billet

作者：王珏1 2 梅莹2

关键词：镦粗柱状晶 690合金数值模拟

分类号：

出版年,卷(期):页码：2015,40(10):5-11

摘要：

利用单向压缩实验分别获得了以柱状晶和等轴晶为初始组织的690合金高温流变曲线，并将其导入Deform有限软件中，模拟了两种状态下合金的锻造镦粗工艺过程，重点对比了原始组织对镦粗峰值载荷的影响。结果表明：铸态和锻态690合金在热压缩过程中均发生了动态再结晶，在相同变形条件下，锻态合金再结晶比例大。镦粗过程中的峰值载荷随锻压速度的增大和坯料预热温度的减小而升高，且一般情况下铸态合金的峰值载荷更大。两种合金不同温度下应变速率敏感因子的差别导致了二者镦粗峰值载荷随工艺参数变化的规律不同。

True stress-true strain curves of alloys 690 with coarse columnar grains and hexagonal grains were obtained by hot compression tests and implemented into the finite element (FE) simulator. The upsetting processes of the two alloys were simulated by FE software Deform. The influences of original organizations of both cast ingot and forged billet on calculated maximum load during upsetting process were compared. The results show that dynamic recrystallization (DRX) appears during the compression tests of the two alloys 690 with different initial microstructures. DRX fraction is larger in forged billet than in cast ingot under the same deformation parameters. In the numerical simulation, the maximum load increases with the rise of forging speed and reduction of preheating temperature, and is generally larger in cast ingot alloy. Furthermore, the disparities of strain rate sensitivity factors at various temperatures of the two alloys result in the different regularities of the maximum load with the changing forging parameters.

基金项目：

国家自然科学基金青年科学基金资助项目（513010 85）; 南京工程学院引进人才科研启动基金项目（YKJ201305）

王珏（1985-），男，博士，讲师

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