Which microconstituent contributes the highest strength in s

Which microconstituent contributes the highest strength in steels Bainite Martensite Pearlite In general, which cooling agent is chosen for producing martensite in the ironcarbon system water or oil air cooling in furnace The material you choose for an application should have a duetile-to-brittle transition temperature at the service temperature above the service temperature below the service temperature One of the reasons that the mechanical properties of ceramics are usually measured through 3-point tests instead of tensile tests as in metallic materials is ceramics are usually lighter than metals ceramics are difficult to machine and handle using grips etc. ceramics usually have higher Young\'s moduli than metals Which stress - strain curve characterizes a ceramic material?

Solution

27) the answer is option (b) air , Quenching is the process used for cooling martenside in iron carbon system which is a process of exposing the material to atmospheric air and allowing it to cool

28) the answer is option (c) below the service temperature as the strength of the material increases with the decrease in service temperature

29) the answer is option (b) cermaic material being ductile cannot be fractured and it is difficult to grip amaterial without fracturing and therfore tensile test cannot be performed

30) the answer is option (b)