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Microstructural Modifications in AISI 1080 Eutectoid Steel Under Combined Cyclic Heat Treatment
Author(s) -
Mishra Alok,
Mondal Chandan,
Maity Joydeep
Publication year - 2016
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201500227
Subject(s) - cementite , materials science , eutectic system , metallurgy , martensite , quenching (fluorescence) , austenite , microstructure , ledeburite , temperature cycling , thermal , thermodynamics , physics , quantum mechanics , fluorescence
In this research work annealed AISI 1080 steel bars are subjected to a typical combined cyclic heat treatment involving two cycles. The first cycle consist of inserting the specimen in an electric resistance furnace at a temperature of 775 °C (in fully austenitic region) and holding for a short duration (6 min), followed by forced air cooling to the room temperature. In second cycle holding temperature and time being same, the specimen is subjected to oil quenching. Such a typical combined thermal cycling results in the evolution of a novel microstructure that comprises of submicroscopic cementite spheroids and fine microscopic cementite clusters in a matrix of martensite. Accordingly, very high hardness (894 HV) is achieved which envisaged a new heat treatment route of the development of plain carbon tool steel.