Cu和Mo对厚大断面等温淬火球墨铸铁件淬透性的影响  

Influence of Cu and Mo on the Hardenability of Austempered Ductile Iron with Heavy Section

作　　者：沈鹏[1] 曲迎东[1] 李荣德[1] 张新宁[1] 姜珂[1] 

机构地区：[1]沈阳工业大学,辽宁沈阳110870

出　　处：《铸造》2013年第3期187-190,共4页Foundry

基　　金：国家自然科学基金(51274142);辽宁省科技计划项目(2009221005);沈阳市科技攻关项目(F10-035-2-00);沈阳市科技攻关项目(F11-069-2-00)

摘　　要：为提高厚大断面等温淬火球墨铸铁(ADI)件的淬透性,研究了Cu和Mo对铸件淬透性的影响。制备了5组壁厚为150 mm的球墨铸铁试样,5组试样中Ni元素控制在1%,改变Cu和Mo的添加量;经过900℃奥氏体化3 h+385℃等温淬火处理1.5 h,对试样的淬透性及力学性能进行了观察和测试。结果表明:当Mo为0.25%,Cu由0.05%提高到0.75%时,铸件的淬透性没有明显改善,其力学性能偏向于珠光体的力学性能;当Mo提高到0.36%,Cu为0.75%时,铸件的淬透性有了明显的提高,边部没有珠光体析出,心部只存在5%左右的珠光体,其余为较粗的奥铁体组织,同时力学性能也达到了欧洲ADI四级标准。对厚大断面球墨铸铁件进行等温淬火处理时,应首先选择增加少量的Mo元素,而不是增加大量的Cu元素。In order to improve the hardenability ofaustempered ductile iron with heavy section, the influence of Cu and Mo on casting＇ s hardenability was studied. Five groups of ductile iron specimens with 1% Ni and 150 mm thickness were prepared, of which addition amount of Cu and Mo changed. The hardenability and mechanical properties were observed and tested after austenitizing at 900 ~C for 3 h and austemper at 385 ~C for 1.5 h. The results shows that the hardenability of ductile iron dose not improve obviously when Mo is 0.25% and Cu increases from 0.05% to 0.75%, the mechanical properties are corresponding with that ofpearlitic structure. But when Mo increases to 0.36% and Cu is 0.75%, no pearlitic structure appears at the edge ofdultile iron as well as only 5% pearlitic structure is found and others are coarser ausferrite structure in the core. Its mechanical properties meet the grade 4 of the European Community ADI standard. A small amount of Mo should be added instead of a large amount of Cu when ductile iron casting with heavy section is austempered.

关 键 词：厚大断面 等温淬火球墨铸铁 淬透性 

分 类 号：TG164.2[金属学及工艺—热处理]