摘要
采用高淬透性钢进行空冷淬火是一种减少铸件热处理变形和开裂的有效措施。为获得无淬火缺陷且具有一定深度的淬硬层组织,运用有限元法对60kg/m级重轨矫直辊铸件空冷淬火温度场进行了仿真计算,并根据相关模具钢连续转变曲线确定了合适的重轨矫直辊候选材料—X63CrMoV51,在此基础上开展了矫直辊的制造和试用任务。结果表明,采取内孔填充石英砂隔离措施后,X63CrMoV51重轨矫直辊铸件在1025℃左右空冷淬火条件下的淬硬层深度基本上可以达到100mm的规定要求,且避免了油淬时矫直辊变形过大和内孔硬度过高等缺陷的出现,其使用寿命超过现有9Cr2和Cr12MoV油淬矫直辊的使用寿命,说明温度场仿真技术可以用作淬火铸件材料选择的有力工具。
It＇s a feasible practice to quench in air for castings made of steels with higher hardenabUity to reduce or avoid its deformation and crack during heat treatment process. In order to obtain a certain hardened layer without any quenching defect, the simulating calculation of temperature field for grade 60 kg/m heavy rail straightening roller during quenching in air was carried out using finite element method, and the candidate material X63CrMoV51 was selected in accordance with continuous cooling transformation diagrams of some steels with higher hardenability. Finally, the manufacture and tryout of grade 60 kg/m heavy rail straightening roller castings made of steel X63CrMoV51 were performed on the base of above computer simulation. The results show that when the inner hole of the cast roller is shielded from air by fill with quartz sand, the requirement of hardened layer with 100 mm for grade 60 kg/m heavy rail straightening roller made of steel X63CrMoV51 quenched from 1 025℃ in air has been basically met, and the defects, such as excessive deformation and overhigh hardness in the inner hole of the cast roller, have also avoided, which are often present when quenched in oil. In addition, the service life of X63CrMoV51 cast rollers outrun the ones of current 9Cr2 and Cr12MoV rollers quenched in oil, which indicate that the simulation technic of quenching temperature field can be used as a powerful tool in the selection of material for castings.
出处
《铸造》
EI
CAS
CSCD
北大核心
2006年第11期1162-1165,共4页
Foundry
关键词
矫直辊铸件
淬火
温度场
仿真
材料选择
straightening roller casting
quenching
temperature field
simulation
material selection
