Combined with the actual production,high pressure gas quenching vacuum furnace was used to heat treatment of three kinds of shaft parts,30CrMnSiA,1Cr17Ni2 and GH4169.The tensile strength,microstructure,deformation and hardness of the parts were tested and compared with the test results after heat treatment by vacuum oil quenching furnace.The result showed that the hardness of 30CrMnSiA parts(the diameter of φ20 mm)was not qualified at 6 bar quenching pressure,and the hardness,microstruc-ture and hardenability were different from that of vacuum oil quenching process.The hardness of 1 Cr17Ni2 parts(the diameter of φ30 mm)was qualified,and there was no difference in hardness,microstructure and hardenability compared with the vacuum oil quenching process.The hardness of GH4169 parts was qualified when the diameter was less than φ40 mm.In the case of vertical lifting,the deformation of all three parts could be controlled within 0.15 mm without correction.
关键词
高压真空气淬/变形量/淬透性/气体淬火压力
Key words
high pressure vacuum quenching/deformation/hardenability/gas quenching pressure
维普
万方数据