百万千瓦级核电转子中心压实过程的有限元模拟
Finite Element Simulation of Consolidated Forging Process for 1000MW Nuclear Rotor
李世键1， 孙明月1， 李殿中1， 孙 嫘2， 孙海燕2
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作者单位：(1.中国科学院 金属研究所，沈阳材料科学国家(联合)实验室，辽宁 沈阳 110016；2.二重集团(德阳) 重型装备有限公司，四川 德阳 618000)
中文关键字：锻造； 缺陷； 核电转子； 有限元模拟
英文关键字： forging; defects; nuclear rotor; finite element simulation
中文摘要： 实测了核电转子用25Cr2Ni4MoV钢的高温应力－应变曲线和热物性数据，基于ABAQUS软件建立了百万千瓦级核电转子中心压实过程的三维热力耦合有限元模型，模拟分析了4种条件下锻件轴线区域等效应变与静水应力的演化规律。结果表明：在锻件的应变水平上，镦粗方案的轴线中部区域的等效应变是不镦粗方案的1.5倍，而轴线两端区域的等效应变则相差不大；在锻件的静水应力方面，镦粗方案的静水压应力为不镦粗方案的1.6～2.0倍。对550 t钢锭的压实效果评估表明：不镦粗方案虽然满足缺陷愈合的应变条件，却难以满足静水应力条件；而镦粗方案能同时满足应变与静水应力条件。最后，根据优选的方案进行了现场实施，获得了质量满足要求的锻件。
英文摘要： Based on the measured stress-strain curves and thermo-physical data of 25Cr2Ni4 steel, a coupled thermo-mechanical 3D FEM model of consolidated forging process for 1000MW nuclear rotor was established through ABAQUS software，the evolution of effective strain and hydrostatic stress on axial line of the ingot was studied under four different simulated condition. The results show that the finial effective strain in the middle of axial line of the ingot under upsetting projects is 1.5 times that under non-upsetting projects, however, the differences of effective strain in the two ends of axial line of the ingot isn't remarkable. Furthermore, the hydrostatic stress of upsetting projects is 1.6~2.0 times of non-upsetting projects. The consolidating effects for the 550 t ingot are discussed and evaluated with the criterion of defects healing, the results show that the non-upsetting projects can only fulfill the effective strain condition, while both the effective strain and hydrostatic stress conditions are achieved for upsetting projects. Finally, a nuclear rotor forging was made in the workshop with the optimized project and the product satisfied requirement.