In Precipitation hardening, strengthening is produced by: Cold work Increase in

Question

In Precipitation hardening, strengthening is produced by: Cold work Increase in grain boundries Increased covalent bond strength Increased ionic bond strength Hardenability is defined as: Minimum hardness Ease of forming martensite Resistance to dislocation movement Rockwell hardness The micro definition of strength in metals is: Plastic deformation Grain size Impact strength Resistance to dislocation movement A 1030 steel is austenitized and water quenched. What is the BHN? 596 642 380 524 The critical radius ratio for triangular coordination of 3 anions of radius R surrounding a central cation of radius r is: 0.732 0.414 0.225 0.155

Explanation / Answer

21.

Option A is correct.

Item gets heated in precipitation hardening and strengh is increased in cold work.

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