核电用奥氏体不锈钢的动态再结晶行为 |
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引用本文: | 杨晓雅,何岸,谢甘霖,王西涛.核电用奥氏体不锈钢的动态再结晶行为[J].北京科技大学学报,2015(11):1447-1455. |
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作者姓名: | 杨晓雅 何岸 谢甘霖 王西涛 |
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作者单位: | 1. 北京科技大学新金属材料国家重点实验室,北京,100083;2. 北京科技大学新金属材料国家重点实验室,北京100083;亚琛工业大学钢铁冶金系,亚琛52072,德国;3. 北京科技大学钢铁共性技术协同创新中心,北京,100083 |
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基金项目: | 国家高技术研究发展计划项目,国家重大专项项目 |
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摘 要: | 利用 Gleeble-1500D 热模拟试验机对316LN 奥氏体不锈钢进行单道次热压缩试验,分别设置变形温度为900~1200℃、应变速率为0. 001~10 s-1、真应变为0. 1~0. 9及试样的初始晶粒度为122~297μm之间,以研究热变形条件及初始晶粒度对316LN钢动态再结晶行为的影响. 对试验数据进行处理,得到临界应变与峰值应变以及临界应力与峰值应力的比值分别为0. 38和0. 89,建立了动态再结晶动力学方程和晶粒尺寸演变方程. 对建立的动态再结晶模型进行修正,将修正后的模型嵌入DEFORM-3D有限元模拟软件中进行计算,发现修正模型的模拟值和试验值符合较好,证明修正模型的准确性.
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关 键 词: | 奥氏体不锈钢 热变形 动态再结晶 数学模型 数值模拟 核电站 |
Dynamic recrystallization behavior of an austenitic stainless steel for nuclear power plants |
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Abstract: | In order to study the effects of deformation conditions and initial grain size on the dynamic recrystallization behavior of 316LN austenitic stainless steel, single pass hot compression tests were conducted on a Gleeble-1500D thermal-mechanical simulator with the deformation temperature of 900-1200℃, the strain rate of 0. 001-10 s-1 , the true strain of 0. 1-0. 9 and the initial grain size of 122-297μm. It is obtained that the ratio of critical strain to peak strain and the ratio of critical stress to peak stress are 0. 38 and 0. 89, respectively. A dynamic recrystallization kinetic model and a grain size evolution model were established based on experi-mental data. In addition, the developed models were modified for DEFORM-3D finite element simulation. It can be found that the simulated values by the modified model and experimental data agree well, indicating that the modified models have good accuracy. |
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Keywords: | austenitic stainless steel hot deformation dynamic recrystallization mathematical models numerical simulation nuclear power plants |
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