Research and Application of High-Rigidity Low-Stress Ductile Iron QT600-3

摘要：

　　The factors affecting dimensional accuracy and precision of retention of lathe body castings are material rigidity,residual stress and deformation.In the present research,Y-type blocks and stress frames were poured,and tensile test,metallographic test,scanning electron microscope analysis,and massive residual stress measurement were carried out.The effects of alloying elements(Cu,Mn,Sn,Cr,Ni),silicon content,carbon equivalent,shakeout temperature and aging treatment on elastic modulus and residual stress of gray iron and ductile iron were studied.T-type lathe bedway samples were poured for production verification.Results show that alloying elements,silicon content,and pearlite have significant effects on the elastic modulus of ductile iron.The change range of elastic modulus of ductile iron samples is between 147 GPa and 177 GPa.Ductile iron with 0.5-0.7%Cu,0.4-0.6%Mn,and 0.04-0.06%Sn has high tensile strength(≥ 600 MPa)and elastic modulus(≥ 160 GPa).The higher the carbon equivalent,the lower the residual stress of gray iron and ductile iron.Lower shakeout temperature can help to reduce the residual stress.The residual stress of gray iron and ductile iron is below 20 MPa and 50 MPa,respectively,after “multi-step temperature rising/falling” heat aging treatment.It is an effective approach to obtaining high-rigidity lowstress QT600-3 ductile iron by 0.5-0.7%Cu,0.4-0.6%Mn,and 0.04-0.06%Sn compound alloying and a “multi-step temperature rising/falling” heat aging under higher carbon equivalent(4.4-4.6%)condition.A high-rigidity low-stress QT600-3 ductile iron beam casting was successfully made.

关键词： alloying carbon equivalent elastic modulus residual stress aging treatment ductile iron

作者: Dong-hai Wei Ke-rui Li Xian-long Wu Jin-ke Zhao

作者单位: Zhengzhou Research Institute of Mechanical Engineering,Zhengzhou 450001,Henan,China Beijing Beiyi Machine Tool Co.,Ltd.,Beijing 101300,China

会议类型: 国内会议

会议名称: 第十二届中国铸造协会年会暨全球首届铸造论坛、第六届中国金砖国家铸造业论坛

会议地点: 北京

会议语种:英文

页码: 52-64

在线出版日期: 2016-05-14（万方平台首次上网日期，不代表论文的发表时间）