Comparative study of microstructure and properties of as received, heat treated and welded TMT bars of different companies

Abstract

Thermo Mechanically Treated bar has a lot of importance in modern day’s construction technology.We are using TMT bar to make monstrous buildings to heavy bridges throughout the world in various climatic condition(variation of temperature and humidity).This thesis paper attempts to find variation of microstructure configuration of different tmt bar samples ( tata tiscon,srmb,captain) in metallography laboratory and Hardness variation of tmt bar samples(tata tiscon,srmb,captain) from it’s core to peripheral region by VICKER’S Hardness test method and VICKER’S micro hardness test method in our hardness test laboratory. We have tried to examine corrosion behavior of the samples in both fresh water and marine water via corrosion penetration method to determine the change of corrosion penetration rate with the change of salinity. It was attempted to heat treatment( air cooling and quenching in water) to demonstrate the micro structural change(by metallography), hardness change(by VICKER’S hardness number) and corrosion behavior change(by corrosion penetration method).By observing the result we can make some comparison how their micro structural behavior ,hardness number and corrosion behavior changes with various temperature and climatic condition. At the last we have made attempt to examine the heat treated zone microstructure of weldedtmt bar, how it changes from welding zone to head treated zone(HAZ) and heat treated zone(HAZ) to parent zone.