JPS55110723A - Compaction of metal material - Google Patents

Abstract

PURPOSE:To greatly shorten a hot isostatic pressing cycle as well as raise its operation rate by the procedure in which a metal material containing pores, etc., is treated by a hot isostatic pressing method to remove the pores, etc., for compaction and then the diffusing joint of the compacted portion is performed in another heating furnace. CONSTITUTION:A cast or sintered metal body containing pores, etc., is treated by a hot isostatic pressing method(HIP method) at a temperature(T0) and a pressure (P0), as shown in Fig. to remove pores, etc., from the cast or sintered metal body while keeping the metal body at the temperature and pressure T0 and P0 for compaction up to the true density as shown in Fig. In this case, since junctions at pores and voids are left crackled, however, the HIP treatment is stopped and the metal body is heated for a heating period from t5-t6, as shown in Fig. in the usual type heating furnace, whereby the crackly junctions are jointed by diffusion to rise the flexture strength to the value F0 when the material is homogenized. Thus, metal materials containing pores, voids, etc., can be homogenized by shortening greatly the treatment time by HIP method and raising the operational rate of HIP method equipment.