Why same casting has different hardness and machineability properties? One spot

Why same casting has different hardness and machineability
properties? One spot it is found hard for machining and
another spot soft? It is FG 260 grade for Cast Iron.

Question Posted / dhan

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Why same casting has different hardness and machineability properties? One spot it is found hard fo..

Answer / anil kamat

If it is a free flow single gate single runner casting then
the density variation leads to the diffrence in properties
across various sections. To get uniform density variation
usually pressure flow multigate multirunner castings are
preferred.

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11 Yes

3 No

Why same casting has different hardness and machineability properties? One spot it is found hard fo..

Answer / preethi

uneven solidification results in different grain size and
that leads to the difference in hardness. the surface of the
cast will have finer grains due to faster solidification
(comparatively high temperature gradient) than the core.

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10 Yes

4 No

Why same casting has different hardness and machineability properties? One spot it is found hard fo..

Answer / shashikant g. sane

The casting must have solidified with uneven cooling rates.
So the part that has cooled faster has developed extra
hardness.

Is This Answer Correct ?

6 Yes

2 No

Why same casting has different hardness and machineability properties? One spot it is found hard fo..

Answer / hardik

due to segrigation

Is This Answer Correct ?

2 Yes

3 No

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