Which metal hardening mechanism is reversible by annealing (heat treatment) of the material? You are given...

Which metal hardening mechanism is reversible by annealing (heat treatment) of the material?

You are given an alpha-titanium alloy to process into a turbine blade. Based on the fact that the alloy has an HCP crystal structure, what general processing technique would you consider for the processing of the turbine blade? Explain your choice.

Expert Solution

Annealing is a procedure in which we involve heat to hold a certain temperature of alloy, and followed by controlled cooling. It results the relief in internal stresses, softening, and homogenization. After that, the grain is converted to more stable state.

Now, we know another method of hardening. This is known as Cold work. In this method, the dislocation density increases with the increase of strength. So, the material becomes harder. Also, ductility and tensile strength increases.

So, a process of cold work followed by Annealing, the hardness mechanism will be reversed.

Alpha titanium alloy has a hexagonal close packing (HCP). So, this is stable at room temperature and remains stable up to the temperature of 885^oC. Over this temperature, the alloy starts turning to beta alloy.

Also, it has a very good oxidation resistance, very good stability at elevated temperature. So, for this, the annealing is the best method to convert in blades.

Method:

So, we should heat the alloy below 885^oC, then the strain will be relieved, and the thinning will be possible.

After thinning, let us go for a controlled cooling. If we do this, the homogenization will be reached, but the strength will be again regained. So, this will be more stable state.

So, ductility and tensile strength will also be increased.

queen_honey_blossom answered 5 months ago

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