发明名称 HEAT TREATMENT
摘要 PURPOSE:To execute a heat treatment with substantially no soft spots and quenching strains by disposing a metallic means for the heat treatment having the outside surface similar to the inside surface of a vessel to be heat-treated and the coefft. of thermal expansion larger than the coefft. of thermal expansion of said vessel to the inside surface of the vessel, heating the vessel and means while feeding an inert gas between both and cooling simultaneously the same. CONSTITUTION:Ceramic powder of BN, etc. is coated as a diffusion preventive material onto the outside surface 3a of a semi-spherical metallic mold 3 and thereafter the hollow vessel 2 to be heat-treated is put on the surface 3a. The vessel 2 is fixed to the jig 1 for the heat treatment. The vessel 2 is installed together with the jig 1 in a heating furnace and while the inert gas such as gaseous Ar is supplied 6 to the space part 10 between the inside surface 2a and the outside surface 3a of the vessel 2, the vessel 2 is heated to the prescribed heat treatment temp. and is held at said temp. for proper time. The mold 3 contacts tightly with the vessel 2 by the difference in the coefft. of thermal expansion as mentioned above, then the vessel 2 and the jig 1 which are held in the leveled state is taken out of the heating furnace and is thereafter subjected to a quick cooling treatment. The vessel 2 is then separated from the mold 3. The vessel 2 after the heat treatment has the extremely small heat treatment strain and the surface 2a is not exposed to the atm. air during heating and therefore the good surface skin is provided to said surface.
申请公布号 JPS61276960(A) 申请公布日期 1986.12.06
申请号 JP19850119467 申请日期 1985.05.31
申请人 NISSAN MOTOR CO LTD 发明人 NAKANOSE MEGUMI;SOHARA YUTAKA
分类号 C22F1/18;C21D1/00;C21D1/18;C21D9/00 主分类号 C22F1/18
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