Journal ArticleDOI
Effect of martensite morphology and volume fraction on strain hardening and fracture behavior of martensite–ferrite dual phase steel
TLDR
In this article, two different morphologies of martensite in dual phase (DP) steel were obtained using two different processing routes: intermediate quenching and inter-critical annealing.Abstract:
Two different morphologies of martensite in dual phase (DP) steel were obtained using two different processing routes. In one case, intermediate quenching (IQ) was adapted, where DP steel was water-quenched to obtain martensite phase, followed by inter-critical annealing. In the second case, the steel was cold rolled, followed by inter-critical annealing (CR-IA). For IQ and CR-IA steels, the inter-critical temperatures varied from 750 °C to 850 °C to obtain different volume fractions of martensite. An understanding of structure–property was obtained using a combination of scanning electron microscope (SEM), transmission electron microscope (TEM), and tensile tests. It was observed that fibrous martensite presented in IQ samples, gradually transformed to blocky martensite with increase in inter-critical temperature, resembling the CR-IA steels. The fibrous martensite encouraged martensite cracking, however, the martensite cracking was dramatically decreased in the IQ samples with increase in martensite fraction. The strain hardening behavior studied using the differential C – J model indicated multistage depending on the fraction of martensite. The low volume fraction of martensite in the DP steel provided high ductility–toughness combination and improved strain hardening ability due to the presence of soft ferrite phase in DP steel. Fibrous martensite in DP steel resulted in less strain hardening than blocky martensite, prior to exceeding a threshold volume fraction. The threshold value was significantly smaller for DP steel with blocky martensite.read more
Citations
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Journal ArticleDOI
Characterization of Titanium Lattice Structures Fabricated by Selective Laser Melting Using an Adapted Compressive Test Method
TL;DR: In this paper, the effect of various process and design parameters on the dimensional accuracy and compressive strength of cellular lattice structures fabricated using selective laser melting (SLM) was investigated.
Journal ArticleDOI
Finite element and experimental method for analyzing the effects of martensite morphologies on the formability of DP steels
M. Alipour,Mohammadamin Torabi,Mohammad Sareban,Hadi Lashini,Ehsan Sadeghi,Abolfazl Fazaeli,Mostafa Habibi,Ramin Hashemi +7 more
TL;DR: In this article, the authors investigated the effect of martensite morphology on the mechanical properties and formability of dual phase steels at first, three heat treatment cycles were subjected to a low heat treatment cycle.
Journal ArticleDOI
Unraveling the Initial Microstructure Effects on Mechanical Properties and Work-Hardening Capacity of Dual-Phase Steel
TL;DR: In this article, it was revealed that the strength, ductility, and work-hardening rate of Ferritic-martensitic, dual-phase (DP) steels strongly depend on the volume fraction and the morphology of the martensite phase.
Journal ArticleDOI
A novel and simple technique for development of dual phase steels with excellent ductility
TL;DR: In this paper, a new and simple approach was introduced to produce dual phase (DP) steels with excellent ductility, which included intercritical annealing of a cold-rolled ferrite pearlite structure followed by water quenching to produce a ferrite-martensite duplex structure.
Journal ArticleDOI
Creep properties, creep deformation behavior, and microstructural evolution of 9Cr-3W-3Co-1CuVNbB martensite ferritic steel
TL;DR: In this paper, the relationship between minimum creep rate and applied stress followed the Bird-Mukherjee-Dorn (BMD) equation, and the modified BMD equation was proposed using threshold stress to elucidate the actual creep deformation mechanism.
References
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TL;DR: The geometrically necessary dislocations as discussed by the authors were introduced to distinguish them from the statistically storages in pure crystals during straining and are responsible for the normal 3-stage hardening.
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TL;DR: In this article, orientation gradients and geometrically necessary dislocations (GNDs) in two ultrafine grained dual-phase steels with different martensite particle size and volume fraction were analyzed using high-resolution electron backscatter diffraction (EBSD).
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Martensite in steel: strength and structure
TL;DR: In this paper, the authors reviewed the strengthening mechanisms associated with the various components of martensitic microstructures in steels and other ferrous alloys and examined the experiments and strengthening theories associated with FeNi and FeNi-C alloys, in which the martensite, because of subzero temperatures, can be evaluated with carbon atoms trapped in octahedral interstitial sites.
Journal ArticleDOI
Deformation and fracture mechanisms in fine- and ultrafine-grained ferrite/martensite dual-phase steels and the effect of aging
TL;DR: In this paper, three ferrite/martensite dual-phase steels varying in the ferrite grain size (12.4, 2.4 and 1.2μm) but with the same martensite content (∼30 vol%) were produced by large-strain warm deformation at different deformation temperatures, followed by intercritical annealing.