Whether it is possible to temper oil quenched 4140 steel alloy having the diameter of 25 mm, and the resultant specimen can give a minimum ductility of 17% EL and minimum yield strength of 950 MPa. What is the tempering temperature and explain why?

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Chapter 11.9, Problem 12DP

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Whether it is possible to temper oil quenched 4140 steel alloy having the diameter of 25 mm, and the resultant specimen can give a minimum ductility of 17% EL and minimum yield strength of 950 MPa. What is the tempering temperature and explain why?

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