长轴类零件高压真空气淬工艺应用研究

Application of High Pressure Vacuum Gas Quenching Process for Long Shaft Parts

结合生产实际采用高压气淬真空炉对30CrMnSiA、1Cr17Ni2和GH4169三种轴类零件进行热处理,通过测试抗拉强度、观察显微组织和检测零件变形量及硬度,并与真空油淬炉热处理后的试验结果进行对比。结果表明,在6 bar气体淬火压力下30CrMnSiA零件(直径φ20 mm)硬度不合格,与真空油淬工艺相比,其硬度、显微组织和淬透性差异较大。1Cr17Ni2零件(直径φ30 mm)硬度合格,与真空油淬工艺相比,硬度、显微组织和淬透性无明显差异。直径不大于φ40 mm的GH4169零件的硬度合格。在垂直吊装的情况下,三种零件变形量均能够控制在0.15 mm内,无需进行校正。

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,microstructure and hardenability were different from that of vacuum oil quenching process.The hardness of 1Cr17Ni2 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.