Abstract
An extensive investigation has been carried out to study structure-property characteristics and corrosion behavior in three varieties of thermomechanically treated (TMT) reinforcement bars (rebars) produced in an integrated steel plant under the Steel Authority of India Limited. Three experimental steel heats–one of plain-carbon and two of low-alloy chemistry-were chosen for the study. Of the two lowalloy heats, one was copper-bearing and the other contained both copper and chromium for improved corrosion resistance. Hot-rolled bars for each specific chemistry were subjected to in-line thermomechanical treatment, where quenching parameters were altered to achieve different yield strength levels.
All the TMT rebars, regardless of chemistry and strength level, exhibited a composite microstructure consisting of ferrite-pearlite at the core and tempered martensite at the rim. Although a tendency toward formation of Widmanstätten ferrite was evident in bars of 500 and 550 MPa yield strength levels, no adverse effect on their strength and ductility was observed. From the standpoint of mechanical properties, the rebars not only conformed to minimum yield strength requirements, but also exhibited high elongation values (21 to 28%) and excellent bendability. Corrosion studies of both TMT and cold-twisted and deformed (CTD) rebars subjected to different laboratory tests indicated that corrosion resistance increased in this order: CTD, plain-carbon TMT, copper-bearing TMT, and copper/chromium-bearing TMT.
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Y.T. Khudik, A.V. Ivchenko, O.A. Chaikovskii, S.A. Madtyan, M.I. Kostyuchenko, and I.N. Surikov, Thermomechanically Strengthened 25G2S Reinforcing Steel of Strength Class At-IVS, Steel USSR, Vol 18 (No. 6), 1988, p 272–277
K. Frommann and CM. Vlad, Mechanical and Technological Properties of TEMPRIMAR Weldable High Strength Rebars, 27th Mechanical Working and Steel Processing Conf. Proc, Vol 23, Iron and Steel Society, 1986, p 901-907
S.A. Madatyan, Main Trends in Development of Production and Use of Steel Reinforcing Bars, Steel USSR, Vol 21 (No. 7), 1991, p 322–325 4. T. Zaizen, T. Watanabe, K. Okamato, K. Kanaya, M. Sato, T. Haze, and Y. Ohno, Low C-Cu-P Type Superior Atmospheric Corrosion Resistant Steel for Welded Structures, Nippon Steel Tech. Rep., No. 22, Dec 1983, p 61–73
D.T. Llewellyn, Low-Carbon Structural Steels, Steels: Metallurgy and Applications, Butterworth Heinemann, 1992, p 64–119
CM. Vlad, A Comparison between the TEMPRIMAR and TEMPCORE Processes for Production of High Strength Rebars, 27th Mechanical Working and Steel Processing Conf. Proc, Vol 23, Iron and Steel Society, 1986, p 909–912
S.L. Chawla and R.K. Gupta, Factors Influencing Corrosion and Its Forms, Material Selection for Corrosion Control, ASM International, 1993, p 29–63
W.K. Boyd and F.W. Fink, “Corrosion of Metals in the Atmosphere,” MCIC Report No. 74-23, Battelle Columbus Laboratories, Aug 1974, p 1–77
S.W. Dean, Jr., Electrochemical Methods of Corrosion Testing, Electrochemical Techniques for Corrosion, R. Baboian, Ed., National Association of Corrosion Engineers, 1978, p 52–60
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Ray, A., Mukerjee, D., Sen, S.K. et al. Microstructure and properties of thermomechanically strengthened reinforcement bars: a comparative assessment of plain-carbon and low-alloy steel grades. J. of Materi Eng and Perform 6, 335–343 (1997). https://doi.org/10.1007/s11665-997-0098-9
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DOI: https://doi.org/10.1007/s11665-997-0098-9