Innovation and Processing of Novel Tough Ductile Ultra-High Strength Steels through TMR-DQP Processing Route

Mahesh C. Somani; David A. Porter; L. Pentti Karjalainen; Pasi Suikkanen; R.D.K. Misra

doi:10.4028/www.scientific.net/MSF.783-786.1009

Paper Titles

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Mechanical and Corrosion Properties of Welded Joints in New Generation Ferritic and Duplex Stainless Steels
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Innovation and Processing of Novel Tough Ductile Ultra-High Strength Steels through TMR-DQP Processing Route
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The Effects of Cooling Rate on Retained Austenite Characteristics of a 0.2C-1.5Si-1.5Mn-1.0Cr-0.05Nb TRIP-Aided Martensitic Steel
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Static Grain Growth in an Austenitic Stainless Steel Subjected to Intense Plastic Straining
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Effect of Austenite Grain Size on the Mechanical Properties in Air-Cooled 0.1C-5Mn Martensitic Steel
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HomeMaterials Science ForumMaterials Science Forum Vols. 783-786Innovation and Processing of Novel Tough Ductile...

Innovation and Processing of Novel Tough Ductile Ultra-High Strength Steels through TMR-DQP Processing Route

Abstract:

Based on the recent concept of quenching and partitioning (Q&P), a novel TMR-DQP (thermomechanical rolling followed by direct quenching and partitioning) processing route has been established for the development of ultra-high strength structural steels with yield strengths ≈1100 MPa combined with good uniform and total elongations and impact toughness. Suitable compositions were designed based on high silicon and/or aluminium contents with or without small additions of Nb, Mo or Ni. The DQP parameters were established with the aid of physical simulation on a Gleeble simulator. Finally, the TMR-DQP processing route was designed for trials on a laboratory rolling mill. Metallographic studies showed that the desired martensite-austenite microstructures were achieved thus providing the targeted mechanical properties. The advantage of strained austenite in refining the martensite packets/blocks was clearly evident. No adverse effect of prolonged partitioning simulating the coiling stage has been noticed suggesting new possibilities for strip and plate products. Promising results in respect of microstructures and mechanical properties indicate that there are possibilities for developing tough ductile structural steels through the TMR-DQP route.

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Periodical:

Materials Science Forum (Volumes 783-786)

Pages:

1009-1014

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.783-786.1009

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Online since:

May 2014

Authors:

Mahesh C. Somani*, David A. Porter, L. Pentti Karjalainen, Pasi Suikkanen, R.D.K. Misra

Keywords:

Direct Quenching, EBSD, Electron Microscopy, Finish Rolling Temperature, Martensite, Partitioning, Quenching, Retained Austenite, Thermo-Mechanical Rolling, X-Ray Diffraction (XRD)

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