镂空铸型对QT400-18组织和力学性能的影响  

Effect of Hollow Mold on Microstructure and Mechanical Properties of QT400-18

作　　者：张龙江 马秉平 刘天平 苏少静 纳建虹 ZHANG Long-jiang;MA Bing-ping;LIU Tian-ping;SU Shao-jing;NA Jian-hong(Kocel Machinery Limited,Yinchuan Ningxia 750021,China)

机构地区：[1]共享装备股份有限公司,宁夏银川750021

出　　处：《铸造设备与工艺》2022年第3期19-20,24,共3页Foundry Equipment & Technology

基　　金：宁夏回族自治区重点研发计划(项目编号:2020BCE01003)。

摘　　要：本文研究了密实和镂空铸型对QT400-18组织和力学性能的影响。两种铸型浇注的QT400-18试块的基体组织、石墨平均尺寸、石墨数量都变化不大,但是球化率有差别,密实铸型的球化率为82%,镂空后的球化率为91%.用镂空铸型浇注的QT400-18试块的布氏硬度从152HBW提高至161HBW,抗拉强度从498 MPa提高至508 MPa,断后伸长率从17.7%提高到18.5%.本文的研究结果为铸件冷却速率的调控提供了一种新的思路。The effect of dense sand mold and hollow sand mold on microstructure and mechanical properties of QT400-Y25casting was studied. The matrix structure, average graphite size and graphite quantity of QT400-18 test block cast by two kinds of sand have little change, but the spheroidization rate is different. The spheroidization rate of test blocks obtained by dense sand type is82%, while that by hollow sand type is 91%. The hardness of QT400-18 test block with hollow sand casting increased from 152HBW to 161HBW, the tensile strength increased from 498 MPa to 508 MPa, and the elongation after fracture increased from 17.7% to18.5%.

关 键 词：QT400-Y25 组织 力学性能 镂空铸型 

分 类 号：TG245[金属学及工艺—铸造]