铸造技术2018，Vol.39Issue(1)：178-181,4.DOI:10.16410/j.issn1000-8365.2018.01.048
淬火工艺对球墨铸铁汽缸套组织及性能的影响
Effect of Quenching Process on Microstructure and Properties of Nodular Cast Iron Cylinder Liner
陈海军 1张亮亮 2秦小才2
作者信息
- 1. 河南工程学院机械工程学院,河南郑州451191
- 2. 中原内配集团股份有限公司,河南焦作454750
- 折叠
摘要
Abstract
The effect of subcritical quenching and conventional isothermal quenching on the microstructure and properties of nodular cast iron cylinder liner was studied.The results show that the microstructure of nodular cast iron consists of the lower bainite,copper-rich residual austenite,ferrite and a small amount of carbide with niobium,which hardness is greater than or equal to 300 HB after quenching;While the microstructure of nodular cast iron consists of the lower bainite,copper-rich residual austenite and a small amount carbide with niobium,which hardness was greater than or equal to 350 HB after conventional isothermal quenching.Compared to the cylinder liner with the conventional isothermal quenching,for the cylinder liner with subcritical quenching,the tensile strength and hardness decrease,the elastic modulus,coefficient of linear expansion and thermal conductivity are basically unchanged,the elongation increases.The friction coefficient of both decreases with the speed increases,but that of subcritical quenching is smaller than that one with conventional isothermal quenching at a constant load and lubrication condition.The processing performance of subcritical quenching cylinder liner is significantly improved,and the number of cylinder liners processed is more than 5 times as those with the conventional isothermal quenching under the same conditions.关键词
亚温淬火/等温淬火/下贝氏体/富铜相/铁素体/球墨铸铁Key words
subcritical quenching/austempering/low bainite/copper-rich phase/ferrite/nodular cast iron分类
矿业与冶金引用本文复制引用
陈海军,张亮亮,秦小才..淬火工艺对球墨铸铁汽缸套组织及性能的影响[J].铸造技术,2018,39(1):178-181,4.
