Effect of Rare Earth Y on Mechanical Properties of GCr15 Bearing Steel
In order to explore the effect of rare earth Y on the mechanical properties of GCr15 bearing steel,GCr15 bearing steels with different Y contents were smelted by vacuum induction furnace.The effects of Y on the hardness,impact property,tensile property and inclusion of GCr15 bearing steel were studied by using MC010-HV-30Z Vickers hardness tester,SAN-ZBC2752A type impact testing machine,CSS-88500 type electronic universal testing machine,JSM-6510 type scanning electron microscope,and Sigma-300 field emission scanning electron microscope.The results show that when Y content is 0.005%,the test steel has good comprehensive mechanical properties.Y slightly reduces the hardness of GCr15 bearing steel from 258.7 HV to 254.4 HV.The impact energy increases by 17.9%from 17.9 J to 21.1 J.The tensile strength increases by 6.50%from 903.8 MPa to 963.3 MPa.The maximum tensile stress increases by 6.50%from 17.75 kN to 18.97 kN.The elongation after fracture increases by 16.80%.The fracture mode of the test steel transforms from intergranular fracture to transgranular fracture.After Y treatment,the inclusion size decreases from about 3 μm to about 1 μm.The hardness of the test steel decreases slightly,the impact energy,tensile strength and elongation after breaking increase somewhat,and the inclusion size decreases.
NETL
NSTL
万方数据
