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(b) Tungsten is being used at half its melting point and a stress level of 160 MPa. An engineer suggests increasing the grain size by

(b) Tungsten is being used at half its melting point and a stress level of 160 MPa. An engineer suggests increasing the grain size by a factor of four as an effective means of reducing the creep rate. Do you agree with the engineer? Why or why not? What if the stress level was 1.6 MPa

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