Engineering Materials Vol II (microstructures processing design) 2nd ed - M Ashby D Jones (1999) WW Part 15 doc

... constant. Chapter 14: Metal processing Forming pressure No friction p f = σ y . Symbols and formulae 371 Symbol Meaning(units) m mass (kg) m Weibull modulus (dimensionless) M bending moment (N m) M F martensite ... Index Moduli of ceramics and glasses 164, 177 composites 265, 266 foams 273 metals 12 polymers 224, 239 woods 278 Modulus of rupture 164, 181 Monel 7, 12 Mould design...

Ngày tải lên: 11/08/2014, 02:22

... environment. Fine-grained castings Many engineering components – from cast-iron drain covers to aluminium alloy cylin- der heads – are castings, made by pouring molten metal into a mould of the ... be watched. The casting “material” used is ammonium chloride solution, made up by heating water to 50°C and adding ammonium chloride crystals until the solution just becomes saturated. The soluti...

Ngày tải lên: 11/08/2014, 02:22

... processing method could be introduced with economic benefits. Background reading M. F. Ashby and D. R. H. Jones, Engineering Materials I, 2nd edition, Butterworth-Heinemann, 1996. Further reading S. ... mm, or less. 14.4 Aluminium sheet is to be rolled according to the following parameters: sheet width 300 mm, starting thickness 1 mm, reduced thickness 0.8 mm, yield strength 100 M...

Ngày tải lên: 11/08/2014, 02:22

... worked or heat-treated into finished products; and by understanding these, shape and size can, to a large extent, be predicted. Background reading M. F. Ashby and D. R. H. Jones, Engineering Materials ... what moving the molten zone along the bar has done to it: we have removed impurity from the left-hand end of the bar and dumped it at the right- hand end; that is, we have zone refine...

Ngày tải lên: 13/08/2014, 05:20

... devel- oped for use in the aerospace industry, they are now much more widely used. The dominant use of aluminium alloys is in building and construction: panels, roofs, and frames. The second-largest ... equilibrium temperature. If, instead of using undersaturated ammonium chloride solution, we pour saturated solution into the mould, we get what is called “big-bang” nucleation. As the freshly...

Ngày tải lên: 13/08/2014, 05:20

... wear and tear. Untempered martensite is far too brittle for hammer heads. Having solved the immediate problem to our satisfaction we still wondered how the manufacturer had managed to harden the ... bath of molten salt at 450°C. Finally, the heads are removed from the tempering bath and washed in cold water. The rather complicated austenitising treatment is needed be- cause the Standard insis...

Ngày tải lên: 13/08/2014, 05:20

... then re-assembled and poured. When the casting has gone solid it is removed by destroying the mould. Metal moulds are machined from the solid. They Production, forming and joining of metals 143 Chapter ... of a shaped casting will directly determine the strength of the finished article. Gas pores should be avoided, so the liquid metal must be degassed to remove dissolved gases (either by addin...

Ngày tải lên: 13/08/2014, 05:20

... sliding, and allowing the clay to be formed by hand or with simple machinery. When the shaped clay is dried and fired, one com- ponent in it melts and spreads round the other components, bonding ... defect in the small volume subjected to the highest stresses is small. 18.3 Modulus-of-rupture tests were done on samples of ceramic with dimensions l = 100 mm, b = d = 10 mm. The median value of...

Ngày tải lên: 13/08/2014, 05:20