| Bi-Metallic MaterialsIT IS POSSIBLE TO BOND DIFFERENT MATERIALS TOGETHER TO COMBINE DIFFERENT MATERIAL PROPERTIES AND TO SAVE ON EXPENSIVE MATERIALS.
One technique is the solid state diffusion bonding of the materials by hot isostatic pressing (HIP).
The advantage of this technique is that there is virtually no change in material properties.
For example, a widely used combination involves the bonding of high value corrosion and wear - resistant PM steel alloys with conventional mild steels.
The service offered by the Bodycote HIP group includes capsule manufacture, powder filling, evacuation and consolidation HIP.
Large scale combination of different materials may be achieved by HIP diffusion bonding.
Possible combinations are:
- Solid material with solid material
- Powder with solid material
- Powder with powder
For consolidation the materials are encapsulated in a mild or stainless steel container which must be free from leakage at the elevated temperature and pressure of the HIP process.
Container and solid parts must be cleaned before encapsulation to avoid reactions and impurities,
Evacuation, sealing of the capsule and HIP are the final steps in manufacturing PM bi-metallic bars and preforms.
The evacuation tube flattening test is a simple method of checking the effectiveness of the HIP diffusion bonding operation.
| Chemical analysis of typical PM tool steels | | wt% | C | Si | Mn | Cr | Mo | V | Co | W | Nb | bal. | | Cold Work Steels | | PM 1.2380 | 2,3 | 0,4 | 0,3 | 13 | 1,0 | 4,0 | | Fe | | PM 9 | 1,8 | 0,9 | 0,5 | 5,3 | 1,4 | 9,0 | Fe | | PM 10 | 2,4 | 0,9 | 0,5 | 5,2 | 1,3 | 9,7 | Fe | | Corrosion resistant cold work steels | | Fe 64 K | 2,6 | 0,5 | 0,4 | 26 | 1,1 | 2,7 | | 1,5 | Fe | | Fe 70 | 3,8 | 0,5 | 0,5 | 24 | 3,0 | 10 | | | PM 440 | 2,2 | 0,5 | 0,5 | 18 | 0,5 | 5,8 | | High Speed Steels | | PM 23 | 1,3 | 0,4 | 0,3 | 4,2 | 5,0 | 3,1 | | 6,4 | | Fe | | PM T15 | 1,5 | 0,3 | 0,3 | 4,6 | 0,9 | 5,0 | 4,8 | 13 | Fe | | PM M4 | 1,3 | 0,3 | 0,3 | 4,5 | 5,0 | 4,2 | | 5,7 | Fe | | PM 30 | 1,3 | 0,6 | 0,3 | 4,2 | 5,0 | 3,0 | 8,5 | 6,4 | Fe | | PM 60 | 2,3 | 0,4 | 0,3 | 4,0 | 7,0 | 6,5 | 11 | 6,5 | Fe |
Applications
Plastics industry
Food industry
Glass industry
Forging industry
Tool making industry
Mineral and mining industry
Wear and corrosion protection
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