Induction Hardening of a 0.40 % C Novel Microalloyed Steel: Effects of Heating Rate on the Prior Austenite Grain Size

Vahid Javaheri; Nasseh Khodaei; Tun Nyo; David A. Porter

doi:10.4028/www.scientific.net/MSF.941.64

Paper Titles

On the Microstructural Characteristics of UFG Microalloyed Steel Influencing the Mechanical Behavior under Dynamic Loading
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Critical Strain for Complete Austenite Recrystallisation during Rough Rolling of C-Mn Steel and Nb-Ti-V Microalloyed Steel
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Effect of Quenching and Partitioning Processing on Microstructure and Mechanical Properties of a Low Alloyed Steel
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Optimization of Pulse-Step Method for Liquid Steel Alloying in One Strand Slab Tundish
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Induction Hardening of a 0.40 % C Novel Microalloyed Steel: Effects of Heating Rate on the Prior Austenite Grain Size
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Microalloying Additions to Commodity C-Mn Structural Steels: Fundamental Strengthening Mechanisms Leading to Improvements in Mechanical Properties, Alloy Optimization, Reduced Alloy Costs and Robustness of Hot Rolling Processing
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An Integrated Model for Rolling Schedule Design of Microalloyed Steels
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Influence of Aluminium on Castability of V-Microalloyed Steels
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Through-Scale Analysis of Strain Path Effects in Microalloyed Austenite Subjected to Reverse Rolling
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HomeMaterials Science ForumMaterials Science Forum Vol. 941Induction Hardening of a 0.40 % C Novel...

Induction Hardening of a 0.40 % C Novel Microalloyed Steel: Effects of Heating Rate on the Prior Austenite Grain Size

Abstract:

This work explores the effect of heating rate on the prior austenite grain size and hardness of a thermomechanically processed novel niobium-microalloyed 0.40 % carbon low-alloyed steel intended for use in induction hardened slurry pipelines. The aim was to identify the heating rates that lead to the maximum hardness, for high wear resistance, and minimum prior austenite grain size, for high toughness. For this purpose, a Gleeble 3800 machine has been employed to simulate the induction hardening process and provide dilatometric phase transformation data. The prior austenite grain structure has been reconstructed from the EBSD results using a Matlab^R script supplemented with MTEX texture and crystallography analyses. Heating rates ranged from 1 to 50 °C/s and the cooling rate was 50 °C/s. The results show that the prior austenite grain size greatly depended on the heating rate: compared to the lower heating rates, the maximum heating rate of 50 C/s produces remarkably fine prior austenite grains and a fine final martensitic microstructure after quenching. In addition, a relation between the heating rate and the deviation from equilibrium temperature has been established.

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Periodical:

Materials Science Forum (Volume 941)

Pages:

64-70

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.941.64

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Online since:

December 2018

Authors:

Vahid Javaheri*, Nasseh Khodaei, Tun Nyo, David A. Porter

Keywords:

Dilatometry, Induction Heating, Phase Transformation, Prior Austenite Grain Size

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