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摘要：
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采用GLEEBLE3500热模拟试验机对H13稀土模具钢在不同变形温度（900~1250 ℃）及不同应变速率（0.001~10 s-1）下的流变应力进行检测，检测数据导入Deform-2D软件建立材料数据库，基于刚塑性有限元法对H13稀土模具钢棒材挤压工艺进行模拟分析。在保证棒材整体变形比大于4.0的条件下（实际挤压比为5.6），模拟结果精确预测了挤压载荷-行程曲线，数值模拟中挤压最大载荷为2.1×105 kN(试制过程中挤压最大载荷为2.02×105 kN)；分析了挤压过程中坯料的温度场、应力场和金属流动速度场，揭示了棒材挤压过程中材料流动规律并得出了表面易出现缺陷的区域。研究结果指导现场一次性成功地完成Φ485 mm×6000 mm的H13稀土模具钢大规格棒材挤压制造。
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The flowing stresses of rare earth die steel H13 at 900-1250 ℃ and strain rate from 0.01 to 10 s-1 were tested by GLEEBLE3500 tester respectively. Then, the test data were imported into software Deform-2D to build material database, and the extrusion process of bar for rare earth die steel H13 was simulated numerically by rigid-plastic finite element method. Under the condition that the overall deformation ratio of the bar was more than 4.0 (the actual extrusion ratio was 5.6), the extrusion load-stroke curve was predicted accurately by the simulation results predicted, and the maximum load of extrusion was 2.1×105 kN in numerical simulation (the actual maximum load of extrusion was 2.02×105 kN in the process of trial-produce). Furthermore, the distributions of temperature, stress and flowing velocity of metal were analyzed in the extrusion process, and the rule of metal flowing was discovered to obtain the area where the surface was prone to defect. Thus, the large bar with 485 mm×6000 mm of rare earth die steel H13 was successfully produced in one time with the regarding of the above research results.
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基金项目：
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国家重点研发计划（2017YFB0305200）
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作者简介：
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刘海江（1979-），男，硕士，副研究员
E-mail：13848522181@163.com
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