Types of Deforma on Processing 1 Metal Cas ng Turbine Blade made by Investment Cas ng 2 Shapes may also be made using Powder Metallurgy 3 Cast irons contain 2 4 wt carbon and 1 3 wt silicon 4 Gray Cast Iron Easy to cast no solidi ca on shrinkage Low cost Excellent vibra on dampening easy to machine internal lubricant Poor mechanical proper es in tension 5 Cast Al Si Alloys 356 This alloy contains 7 wt Si and some Mg Note the nger like primary phase and the darker eutec c microstructure 6 Typical Cast Microstructure 7 Wrought alloys derive their strength from mechanical deforma on e g cold working 1020 Steel ferrite with pockets of pearlite Typical microstructure fine grain size cold worked or annealed no porosity too little carbon to form martensite 5000 series aluminum alloys are also made with the inten on of strengthening by cold working It contains some Mg for solid solu on strengthening and increases the extent of work hardening It is used for structural applica ons like buildings and bridges 8 Wrought alloys may be extruded or forged into many shapes 9 Deep drawing of 3000 series aluminum alloys is used to manufacture aluminum cans The large amount of strain associated with can shaping cold works the aluminum 10 Heat Treatable Alloys alloys that use precipita on strengthening e g in aluminum alloys or martensi c transforma ons in steel to increase mechanical strength a er shape forming A er shape forming the material is heated so any strengthening from cold working is lost and replaced by strengthening due to phase transforma ons either precipita on strengthening or martensi c transforma ons 11 Notes associated with Reynolds steel bicycle tube set suggests that the material was quenched and tempered steel Note the reference to lugs rather than welding the frame 753 Heat Treated Manganese Molybdenum The most exclusive tube set from Reynolds Essen ally 531 made with reduced wall thickness and heat treated to increase tensile strength UTS 1080 1280 MPa 70 83 Tsi 157 186 ksi Complete tube set of 11 tubes Frame 8 Fork 3 753 can only be lugged and llet brazed with an alloy of 56 silver below 700 degrees Celsius and sale is restricted only to approved builders cer ed by Reynolds 12 Metallurgical Anatomy of Al Alloys Strength and Ductility Alloy wt Condition 1100 99 0 min O H14 356 7Si 0 3Mg as cast T6 5052 2 5Mg 0 25Cr O H18 6061 1Mg 0 6Si 0 3Cu 0 2Cr O T6 7075 5 6Zn 2 5Mg 1 6Cu 0 2Cr O T6 Yield Strength MPa Ductility EL
View Full Document
Unlocking...