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论文编号:HG015 附任务书,开题报告,外文翻译,论文正文字数:16247,页数:39
摘 要
下贝氏体组织被认为是一种综合力学性能比较理想的组织,而且铬系白口铸铁是一种优良的抗磨材料,因此本课题把贝氏体白口耐磨铸铁作为研究对象。拟采用三种成分的白口铸铁试样,采用三种淬火工艺获得下贝氏体组织。将试样加热至900℃保温1小时全部奥氏体化,在水玻璃中淬火不同时间后在漂珠中保温1.5小时或者在等温硝盐或是等温油中不同温度等温1小时。实验结果表明:试样I (12%-16%Cr、2.8%-3.0%C、0.8%-1.2%Si、0.6%-0.8%Mn );试样II (4%-6%Cr、2.8%-3.0%C、0.8%-1.2%Si、0.6%-0.8%Mn)和试样Ⅲ(2%-3%Cr、2.9%-3.1%C、0.8%-1.2%Si、0.6%-0.8%Mn)在三种工艺下均未得到下贝氏体组织。认定为材料中缺少下贝氏体形成的关键的Ni、 Mo、Cu等合金元素以及形成条件不够,因此生成下贝氏体组织困难。
关键词 贝氏体 白口铸铁 等温淬火 水玻璃
Abstract
Lower Bainite organizations is considered to be a more desirable mechanical properties of the integrated organization,and white cast iron is an excellent anti-wear materials,therefore the subject is a study of bainitic wear-resistant white cast iron .Three components of white cast iron samples to be used in three types of quenching process to get the Lower Bainite.Heating the samples to 900 ° C for 1 hour to form complete austenite, quenching in sodium silicate for different times and then insulating them for 1.5 hours in cenosphere、isothermal oil or isothermal molten salt at different isothermal temperature for 1 hour. Experimental results show:Lower Bainite can not be obtained in sample I (12%-16%Cr、2.8%-3.0%C、0.8%-1.2%Si、0.6%-0.8%Mn );sample Ⅱ(4%-6%Cr、2.8%-3.0%C、0.8%-1.2%Si、0.6%-0.8%Mn);and sample Ⅲ(2%-3%Cr、2.9%-3.1%C、0.8%-1.2%Si、0.6%-0.8%Mn).It''''s considered to be Lacking of Ni, Mo, Cu and other alloying elements,which is very key to Lower Bainite to be obtained,as well as the formation of inadequate conditions, so Lower Bainite is diffcult to be obtained.
Key Words Bainite White cast iron Sodium silicate quenching Isothermal quenching
目 录
1 引言…………………………………………………………………………………………… 1
1.1 研究贝氏体耐磨材料的背景及重要意义……………………………………………… 1
1.2 贝氏体组织与性能…………………………………………………………………2
1.3 铬系抗磨白口铸铁………………………………………………………………………… 5
1.4 铬系抗磨白口铸铁的热处理工艺……………………………………………………… 7
2 试验设备与方案…………………………………………………………………… 13
2.1 实验所用设备……………………………………………………………………… 13
2.2 实验材料…………………………………………………………………………… 13
2.3 实验方案…………………………………………………………………………… 13
3 试验步骤…………………………………………………………………………… 15
3.1 试样的制备………………………………………………………………………… 15
3.2 试样的淬火………………………………………………………………………… 16
4 实验结果…………………………………………………………………………… 18
4.1 试样淬火后的硬度值……………………………………………………………… 18
4.2 显微硬度…………………………………………………………………………… 21
4.3 试样经热处理后的显微组织……………………………………………………… 22
5 结果分析…………………………………………………………………………… 31
5.1 试样经水玻璃淬火后的测量结果的分析………………………………………… 31
5.2 试样经等温淬火后的测量结果分析……………………………………………… 33
5.3 试验总结和改进………………………………………………………………… 34
结论 ………………………………………………………………………………… 36
致谢 ………………………………………………………………………………… 37
参考文献………………………………………………………………………………38