摘要
本文介绍了铸钢件淬火冷却过程中的三维温度场数学模型和梅尼尔组织性能预测模型。采用有限差分法对ZG45起重机制动轮淬火过程进行数值模拟,计算出淬火过程中的温度场变化及各部位在700℃的临界冷却速度,快速预测了ZG45起重机制动轮淬火冷却之后的组织性能分布。结果表明,工件表面淬火冷却速度最快,几乎全部形成马氏体组织,中间厚大部位冷却速度较慢,只有少量马氏体组织,却有大量贝氏体组织。淬火冷却后,工件各部位没有获得铁素体-珠光体组织。从表面到中间厚大部位,工件硬度逐渐增大。
A mathematical model of 3D temperature field in casting steel quenching process and a fast microstructure and performance prediction model based on the Maynier＇ s model was introduced in the paper. The quenching process of ZG45 brake wheel is simulated by using of FDM. The temperature field simulation result and the cooling rate at 700℃ are presented, and the fast prediction result of the microstructure and performance distribution are given. The simulation results demonstrate that the wheel surface is the fastest cooling part with all martensite, while the middle part is slowest with little martensite but plenty ofbainite. There are no ferrite and pearlite after the quenching process, and the hardness increases gradually from the wheel surface to the internal thick part.
出处
《铸造》
CAS
CSCD
北大核心
2014年第1期48-52,共5页
Foundry
基金
国家数控重大专项(2011ZX04014-052
2012ZX04012-011)
教育部新世纪优秀人才支持计划(NCET-09-0396)
湖北省自然科学基金创新群体项目(2010CDA067)
关键词
淬火
铸钢件
数值模拟
组织
硬度
制动轮
quenching
steel casting
numerical simulation
microstructure
hardness
brake wheel
