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ook Inside Get Accessnd out how to access preview-only contenturnal of Materials Engineering and Performancene 1997, Volume 6, Issue 3, pp 335-343

Microstructure and properties of thermomechanically strengthened

einforcement bars: a comparative assessment of plain-carbon andow-alloy steel grades

bstract

n extensive investigation has been carried out to study structure-property characteristics and corrosion behavior

three varieties of thermomechanically treated (TMT) reinforcement bars (rebars) produced in an integrated

eel plant under the Steel Authority of India Limited. Three experimental steel heats–one of plain-carbon and

wo of low-alloy chemistry-were chosen for the study. Of the two lowalloy heats, one was copper-bearing and

e other contained both copper and chromium for improved corrosion resistance. Hot-rolled bars for each

ecific chemistry were subjected to in-line thermomechanical treatment, where quenching parameters were

tered to achieve different yield strength levels.

ll the TMT rebars, regardless of chemistry and strength level, exhibited a composite microstructure consisting

f 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

rength and ductility was observed. From the standpoint of mechanical properties, the rebars not only conformed

minimum yield strength requirements, but also exhibited high elongation values (21 to 28%) and excellentendability. Corrosion studies of both TMT and cold-twisted and deformed (CTD) rebars subjected to different

boratory tests indicated that corrosion resistance increased in this order: CTD, plain-carbon TMT, copper-

earing TMT, and copper/chromium-bearing TMT.

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References (8)

1. Khudik, Y.T., Ivchenko, A.V., Chaikovskii, O.A., Kostyuchenko, S.A. Madtyan, M.I., Surikov, I.N

(1988) Thermomechanically Strengthened 25G2S Reinforcing Steel of Strength Class At-IVS. Steel

USSR 18: pp. 272-277

2. 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

3. Madatyan, S.A. (1991) Main Trends in Development of Production and Use of Steel Reinforcing

Bars. Steel USSR 21: pp. 322-325

4. D.T. Llewellyn, Low-Carbon Structural Steels, Steels: Metallurgy and Applications, Butterworth

Heinemann, 1992, p 64–119

5. 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, Ironand Steel Society, 1986, p 909–912

6. S.L. Chawla and R.K. Gupta, Factors Influencing Corrosion and Its Forms, Material Selection for

Corrosion Control , ASM International, 1993, p 29–63

7. 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

8. 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

About this Article

TitleMicrostructure and properties of thermomechanically strengthened reinforcement bars: acomparative assessment of plain-carbon and low-alloy steel grades

Journal

Journal of Materials Engineering and PerformanceVolume 6, Issue 3 , pp 335-343

Cover Date1997-06-01

DOI10.1007/s11665-997-0098-9

Print ISSN1059-9495

Online ISSN1544-1024

Publisher Springer-Verlag

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Editorial Board

About This Journal

Manuscript Submission

Topics

Characterization and Evaluation of Materials

Materials Science

Tribology, Corrosion and Coatings

Quality Control, Reliability, Safety and Risk

Engineering Design

Keywords

rebars

tempered martensite

thermomechanical treatment

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Materials & Steel

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Chemical Manufacturing

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Authors

A. Ray (1)

D. Mukerjee (1)

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S. K. Sen (1)

A. Bhattacharya (1)

S. K. Dhua (1)

M. S. Prasad (1)

N. Banerjee (1)

A. M. Popli (1)

A. K. Sahu (2)

Author Affiliations

1. Research and Development Centre for Iron and Steel, Steel Authority of India Limited,

834002, Ranchi, India

2. Durgapur Steel Plant, Steel Authority of India Limited Durgapur, 713203, West Bengal,

India

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