Method for adopting powder metallurgy hot isostatic pressing near-net-shape forming technology for preparing motor protecting ring
A powder metallurgy heat and motor guard ring technology, applied in the field of metal materials, can solve the problems of complex process, easy cracks on the surface of the guard ring, uneven internal structure and performance, etc., and achieves simple process, fine grain, and uniform structure and performance. Effect
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[0008] (1) The preparation size is Φ600mm (outer diameter) × 50mm (wall thickness) × 400mm (height) P900 (18Cr-18Mn-0.6N) retaining ring (Note: the size is the size before cold expansion)
[0009] First, the alloy is smelted according to the requirements of P900 (18Cr-18Mn-0.6N) alloy composition, and the powder is made by the nitrogen atomization process, and the average particle size of the powder is controlled at 10μm; then the low carbon steel welding sheath is used, and the final product size is required. Considering the influence of sintering shrinkage, the size of the sheath is Φ720mm (outer diameter) × 60mm (wall thickness) × 480mm (height); the powder is packed into the sheath and compacted, and vacuumed to 10 -1 After Pa, perform welding and sealing, and perform hot isostatic pressing sintering densification after welding. The sintering temperature is 1220℃, pressure is 100MPa, and the holding time is 60min. The sintering and densification treatment is performed to obtain...
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