论文部分内容阅读
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550t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。
The thermal stress-strain curves and thermophysical properties of 25Cr2Ni4MoV steel were measured. Based on the ABAQUS software, a three-dimensional thermo-mechanical coupled finite element model was established to simulate the process of 1 000MW nuclear rotor center compaction. The four conditions of forging axis Evolution of regional equivalent strain and hydrostatic stress. The results show that at the level of the forging, the equivalent strain in the middle of the axis of upsetting scheme is 1.5 times higher than that in the upsetting scheme, while the equivalent strain in the two ends of the axis is not much different. For the hydrostatic stress of the forging , Upsetting hydrostatic pressure program is not upset program 1.6 ~ 2.0 times. The evaluation of the compaction effect on 550t steel ingot shows that the upsetting scheme can not satisfy the hydrostatic stress condition although it meets the strain condition of defect healing, while the upsetting scheme can simultaneously meet the strain and hydrostatic stress conditions. Finally, on-site implementation was carried out according to the preferred protocol, obtaining forgings of satisfactory quality.