Journal ArticleDOI
The influence of Nb on transformation behavior and mechanical properties of TRIP-assisted bainitic–ferritic sheet steels
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In this paper, the concept of microalloying was applied to TRIP-aided bainitic-ferritic (TBF) sheet steel and a newly designed chemical composition was introduced including significantly reduced Si content.Abstract:
In this study the concept of microalloying was applied to TRIP-aided bainitic–ferritic (TBF) sheet steel. A newly designed chemical composition was introduced including significantly reduced Si content. The impact of Nb on phase transformation, microstructure and mechanical properties was investigated. Nb addition was found to indirectly accelerate transformation kinetics through grain refinement resulting in pro-eutectoid ferrite and upper bainite formation. A change in morphology of the bainitic matrix from lath-like to globular was observed as a result of grain refinement. The amount of cementite was reduced and the amount of retained austenite increased through the addition of Nb. The changes in phase transformation and microstructure resulted in significantly improved mechanical properties comprising both elevated stretch formability and edge crack resistance.read more
Citations
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Journal ArticleDOI
The effects of Nb and Mo addition on transformation and properties in low carbon bainitic steels
TL;DR: In this article, the effects of Mo and Nb addition on bainitic transformation, microstructures and properties by metallographic method and dilatometry were investigated in low carbon bainite steels.
Journal ArticleDOI
The relationships of microstructure-mechanical properties in quenching and partitioning (Q&P) steel accompanied with microalloyed carbide precipitation
TL;DR: In this paper, a low carbon steel microalloyed with Nb-V-Ti was heat treated by means of two-step quenching and partitioning (Q&P) process after partial austenitization.
Book ChapterDOI
Dual-phase steels
TL;DR: In this article, the relationship of structure parameters of dual-phase steels (volume fraction and hardness of martensite, ferrite grain size, structure morphology) and various mechanical properties such as yield and tensile strength, strain hardening, elongation are summarized.
Journal ArticleDOI
Microstructure–property relationships in TRIP aided medium-C bainitic steel with lamellar retained austenite
TL;DR: In this paper, the microstructure and mechanical properties of medium-carbon steel that contains silicon, aluminium and microadditions of Nb and Ti were investigated using light, scanning and transmission microscopy methods.
References
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Journal ArticleDOI
A profile refinement method for nuclear and magnetic structures
TL;DR: In this paper, a structure refinement method was described which does not use integrated neutron powder intensities, single or overlapping, but employs directly the profile intensities obtained from step-scanning measurements of the powder diagram.
Journal ArticleDOI
Carbon partitioning into austenite after martensite transformation
TL;DR: In this paper, a model is developed to describe the endpoint of carbon partitioning between quenched martensite and retained austenite, in the absence of carbide formation.
Journal ArticleDOI
Carbon partitioning to austenite from martensite or bainite during the quench and partition (Q&P) process: A critical assessment
Amy J. Clarke,Amy J. Clarke,John G. Speer,Michael K Miller,Robert E. Hackenberg,David V. Edmonds,David K. Matlock,Fernando Rizzo,Kester D. Clarke,E. De Moor +9 more
TL;DR: In this article, two proposed mechanisms for carbon enrichment during partitioning include carbon transport from martensite and/or the formation of carbide-free bainite, and experimentally measured austenite fractions are difficult to explain.
Journal ArticleDOI
Niobium in modern steels
TL;DR: In this paper, the basic metallurgical principles that apply to these steels, for it is the application of these principles that allows the composition-processing-microstructure-mechanical property relationships to be rationalised and exploited.