Research and Applicationof High-Rigidity Low-Stress Ductile Iron QT600-3
The material rigidity,residual stress and deformation of lathe body castings are important factors that effecting the dimensional accuracy and precision of retention.Tensile test,metallographic test,scanning electron microscope analysis and massive residual stress measurement were done.Effect of alloy elements (Cu,Mn,Sn,Cr,Ni),silicon-carbon ratio,carbon equivalent,shakeout temperatureand aging treatment on elastic modulus and residual stress of gray ironand ductile iron were studied.Ttypelathe bedway samples were poured for production verification.Results show that alloy elements,silicon-carbon ratio and pearlite have significant effects on elastic modulus of ductile iron.The change rangeof elastic modulus of ductile iron samples is between 147GPaand 177 GPa.Ductile iron with 0.5~0.7%Cu-0.4~0.6%Mn-0.04~0.06%Sn compound alloying has both high tensile strength(≥600 MPa) and high elastic modulus(≥160GPa).The higherthe 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 respectively is below 20 MPa and 50 MPa after “Multistep temperature rising/falling heat aging treatment.It is an effective approach to obtain high-rigidity low-stress QT600-3 ductile iron by 0.5~0.7%Cu,0.4~0.6%Mn,and 0.04~0.06%Sncompound alloying and “multistep temperature rising/fallingheat aging under higher carbon equivalent (4.4~4.6%) condition.High-rigidity low-stress QT600-3 ductile iron beam casting was successfully made.
alloying carbon equivalent elastic modulus residual stress aging treatment ductile iron
DonghaiWEI KeruiLI XianlongWU JinkeZHAO
Zhengzhou Research Institute of Mechanical Engineering,Zhengzhou 450001,Henan,Chain Beijing Beiyi machine tool Co.,Lrd.,Beijing101300,Chain
国际会议
北京
英文
1-15
2016-05-18（万方平台首次上网日期，不代表论文的发表时间）