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What happens to the fatigue strength of alloys if altered surfaces are produced in Electro discharge machining?

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in Advanced Machining by (962k points)
What happens to the fatigue strength of alloys if altered surfaces are produced in Electro discharge machining?

(a) Increases

(b) Reduces

(c) Enhances

(d) Improves

I have been asked this question during a job interview.

I need to ask this question from EDM-Heat Affected Zone (HAZ) topic in division Thermal Processes of Advanced Machining

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Best answer
The correct option is (b) Reduces

The best I can explain: The altered surface layers that are produced in Electro discharge machining, significantly reduces the fatigue strength of alloys.

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