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Metallurgical and Materials Transactions A

, Volume 50, Issue 12, pp 5816–5838 | Cite as

Effect of Strain-Induced Precipitation on the Austenite Non-recrystallization (Tnr) Behavior of a High Niobium Microalloyed Steel

  • V. Rajinikanth
  • Tipu Kumar
  • B. Mahato
  • Sandip Ghosh ChowdhuryEmail author
  • Sandeep Sangal
Article
  • 100 Downloads

Abstract

The non-recrystallization temperature (Tnr) of high niobium microalloyed steel was determined from both multihit and double-hit compression tests obtained under plane strain condition. The Tnr was determined to be in the range of 985 °C to 1010 °C for multihit conditions. The double-hit tests carried out at an interpass time of 5 seconds gave very low Tnr in the range of 860 °C to 900 °C. In order to understand this, double-hit experiments were carried out for different interpass times (2, 15, 100 seconds) at three different temperatures (950 °C, 1050 °C, and 1150 °C). The negative softening behavior was observed at 950 °C for higher interpass times of 15 and 100 seconds. This implies that the Tnr of this steel is well above 950 °C. This was due to the high amount of strain-induced precipitation of niobium carbonitrides at higher interpass times as revealed from TEM investigation. The precipitate size evolution considering the Dutta and Sellars nucleation condition in TC-PRISMA agrees well with the experimentally observed precipitate sizes. However, the evolution of Zener pinning forces considering TC-PRISMA nucleation condition is similar to both reported and experimentally determined values. The evolution of tensile properties also correlates well with the observed austenite recrystallization softening behavior. Therefore, a minimum interpass time of 15 seconds is required during double-hit compression tests to effectively precipitate Nb(C, N) and delay the static recrystallization softening behavior of this steel. This lead to the determination of comparable Tnr values between double-hit and multihit methods.

Notes

Acknowledgments

The authors from CSIR-NML thank their Director for his kind permission to publish this work. It is a collaborative work between CSIR-NML and IITK. We thank Dr. Amar De, Arcelor Mittal USA, Global R&D, Chicago, USA for providing the microalloyed steel plates. The first author VR also thanks iPSG-NML for funding this project work under Grant No. OLP-0214.

Supplementary material

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Supplementary material 1 (PDF 361 kb)

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2019

Authors and Affiliations

  • V. Rajinikanth
    • 1
    • 2
  • Tipu Kumar
    • 1
  • B. Mahato
    • 1
  • Sandip Ghosh Chowdhury
    • 1
    Email author
  • Sandeep Sangal
    • 2
  1. 1.CSIR-National Metallurgical LaboratoryJamshedpurIndia
  2. 2.Department of Materials Science EngineeringIIT KanpurKanpurIndia

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