等温淬火对灰铸铁缸盖组织与性能的影响
Effect of isothermal quenching on the microstructure and properties of gray cast iron cylinder head
张传龙 1韩亚辉 2伍启华 2李菲 1陈荣标2
作者信息
- 1. 潍柴(潍坊)材料成型制造中心有限公司,山东潍坊 261061
- 2. 潍柴动力股份有限公司,山东潍坊 261061
- 折叠
摘要
等温淬火被广泛用于提高球墨铸铁铸件的力学性能,而在灰铸铁铸件上的研究和应用相对较少.本文对灰铸铁缸盖进行了等温淬火处理,利用光学显微镜、扫描电子显微镜和拉伸试验机等一系列设备对其组织和性能进行分析.结果显示,300 ℃x2 h等温淬火后灰铸铁基体组织为针状铁素体、高碳奥氏体和少许珠光体,片状石墨形态未发生改变.缸盖本体抗拉强度从300 MPa提高到493 MPa,硬度为270 HBW.与缸盖热处理前尺寸相比,平均变形度为0.2159 mm,满足后续机加工尺寸误差要求.
Abstract
Isothermal quenching is widely used to improve the mechanical properties of ductile iron castings,while there are relatively few studies and applications in gray cast iron castings.In this paper,the gray cast iron cylinder head was quenched at an isothermal temperature,and its structure and prop-erties were analyzed by a series of equipment such as optical microscope,scanning electron microscope and tensile testing machine.The results showed that the matrix structure of gray cast iron was acicular ferrite,high-carbon austenite and a little pearlite after isothermal quenching at 300 ℃ × 2 h,and the morphology of flake graphite did not change.The tensile strength of the cylinder head body was in-creased from 300 MPa to 493 MPa,and the hardness was 270 HBW.Compared with the size of the cylinder head before heat treatment,the average deformation is 0.2159 mm,which meets the dimensional error requirements of subsequent machining.
关键词
等温淬火/灰铸铁缸盖/抗拉强度/变形度Key words
Isothermal quenching/Grey cast iron cylinder head/Tensile strength/Deformation引用本文复制引用
出版年
2024
NETL
NSTL
万方数据