47. Can you determine the tensile strength of a material knowing the Rockwell Ha

Question

47. Can you determine the tensile strength of a material knowing the Rockwell Hardness Value? Yes or No 48. Which one of the following is NOT a characteristic of martensitic stainless steel? Aj has a high C than Ferrite B] has no nickel C] can contain Carbide D] Can have a BCC structure E contain sigma phase F] is ferromagnetic. 49. In the principal stable phases of steel the Cementite phase characteristics are: A. B. 50. In tool steels hardness of up to 60 HRe can be obtained by A) Addition of high carbon B) less carbon C) addition of carbides D) none of these

Explanation / Answer

47. Yes ; there are established corelation to obtained.

48. its option [D] ; as Martensite has body centered tetragonal (BCT) structure.

49. A. very hard as it has 6.67 % of carbon.

B. Brittle intermetallic compound having orthorhombic cryatal structure.

50. hardenss in steel is decided by the presence of carbon. as tool steel are medium or high carbon steel. so apropriate answer is option [A].

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