Question

Heat treatment: Water Quench Austenitizing temperature: Holding Time: Cooling Media: Phases Present: Microstouctructure Description: Hardness Value:

Answer 1

p of water quench, · begins by fully sol":- Heat Treatment: water quench. " Austenite temperature: The process of water a hardening for steels is as follows: It begins by autenitizing the steel in the temperature range of - 1500°F-1850°f depending on steel grade. • Holding Time: - For inch (ie. 25.4mm thickness it takes Ihr to fully austenize the sample. As far as other transformations are considers for parenting (isothermal pearlite transformation) holding time can be decided by trial & error otherwise you have to go. through nigorous phase transformation calculations. cooling Media : The only cooling media is water • Phases present -pearlite grain structure, . . [Mixture of ferrite & cementite] 1 (ii) Marlensite T By heating pearlité • Microstructure in - Past its eatectoid : Description : framsition temperature The results show that the microstructure of the dual phase steels mainly consist of the fersite of martensite phase, the mallensite volume fraction. increases gradually on increasing the holding & quenching temperature . Hardness value: The type of hardness carried on the samples was the Rockwell hardnen test as it a anick & direct reading of the hardness Yalues. Forý each test piece, three indentation made & the average value is taken. The symi HR is supplemented by a letter (Borc), which denotes the handnes Scale used ntations are