Which of the following processes permits the transformation of austenite to martensite, throughout the crosssection of a component without cracking or distortion?

Explanation

Re = ​ μ ρV d Explanation: Explanation : Marquenching or Stepped Quenching Articles are first quenched in water to a temperature of 300-400°c and then quickly transferred to a less intensive medium like oil or air where they are held until they are completely cooled. This method is widely used in the heat treatment of steel tools like taps, disc, milling cutter, etc. A larger holding time will cause austenite decomposition. Austenite is transformed into martensite during the subsequent period of cooling to the room temperature. Important Points Heat Treatment Processes Advantages Austempering Quenching cracks between core and surface do not develop. Ductility is increased. Impact strength and toughness are increased. Annealing To reduce hardness To improve machinability To refrain grain size To relieve internal stresses Tempering Residual stresses are relieved Ductility is improved Toughness is increased