热处理冷却方式对铁素体基体球墨铸铁组织与性能的影响  

Effect of Heat Treatment Cooling on Microstructure and Property of Ductile Iron with Ferritic Matrix

作　　者：侯晓霞 张维友[1,3] 赵岩 HOU Xiaoxia;ZHANG Weiyou;ZHAO Yan(School of Mechanical and Electronical Engineering,Dezhou University,Dezhou 253023,China;Research Institute of Engineering Materials,Dezhou University,Dezhou 253023,China;Dezhou Huahai Petroleum Machinery Co.,Ltd.,Dezhou 253000,China)

机构地区：[1]德州学院机电工程学院,山东德州253023 [2]德州学院工程材料研究所,山东德州253023 [3]德州华海石油机械股份有限公司,山东德州253000

出　　处：《铸造技术》2018年第9期2078-2081,共4页Foundry Technology

基　　金：山东省自然科学基金(ZR2014ZL001)

摘　　要：将铁素体基体球墨铸铁加热到930℃保温2 h,分别采用炉冷、空冷、喷雾冷却和水冷,对试样进行组织分析和力学性能测试,研究冷却方式对球墨铸铁组织和性能的影响。结果表明,加热到930℃保温2 h,点状石墨略有减少,球状石墨尺寸有所增加且圆整度提高,并出现脱碳现象,个别球墨消失,留下黑色凹坑;冷却方式对石墨球无明显影响,而基体组织改变较为明显,炉冷时为铁素体基体,空冷和喷雾冷却时为铁素体和珠光体混合基体,而水冷时出现了马氏体。同时,随着冷却速度的提高,球墨铸铁的硬度呈现提高趋势。The ductile iron with ferritic matrix was heated with 930℃ for 2 hrs, the microstructure and mechanical properties of samples with different cooling methods, such as furnace cooling, air cooling, spray cooling and water cooling, were analyzed and measured. The influence of cooling method on the microstructure and properties of nodular cast iron was studied. The results show that the spotted graphite will decrease slightly, the diameter of the spherical graphite increase and the roundness increase when it heats with 930℃ for 2 hrs. Some of the graphite disappeare, leaving black pits. The cooling modes have no obvious effect on the decarbonization of graphite ball, while the change of matrix is obvious. When it is cooling in the furnace, it is ferrite matrix; when it is in air cooling and spray cooling, it is ferrite mixed with pearlite matrix, while martensite appears when water cooling. At the same time, the hardness of nodular cast iron shows an upward trend as a whole with cooling rate increases.

关 键 词：球墨铸铁 冷却方式 石墨组织 基体组织 力学性能 

分 类 号：TG164.2[金属学及工艺—热处理] TG143.5[金属学及工艺—金属学]