Feasibility study for thixoforming nanostructured bainitic steels

Rogal, Łukasz; Solano-Alvarez, W.; Szklarz, Zbigniew; Bhadeshia, H. K. D. H.

doi:10.1016/j.msea.2015.10.089

Cited by 8 publications

(3 citation statements)

References 51 publications

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“…14a. From the lattice distances and their mutual angles measured using FFT, the ferrite/martensite [1][2][3][4][5][6][7][8][9][10][11] zone axis orientation was identified, which fitted well to the simulation of the reciprocal lattice section at that orientation. Additional less visible reflections (marked with arrows) probably from M 3 C or transitional carbides [26][27][28][29] (lattice distance 0.26 nm and angle 36°) visible.…”

Section: Microstructural Stability As a Function Of Production Methodsmentioning

confidence: 65%

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Melt-spinning and semi-solid processing of bainitic steel

Rogal

Solano-Alvarez

Bhadeshia

2017

Materials Science and Technology

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A steel with a chemical composition meant to form nanostructured bainite following appropriate heat treatment, was cooled rapidly from the liquid phase (1550 °C) using melt spinning and modified injection-suction methods, as well as from a semi-solid temperature (1430 °C) through thixoforming. The hardness of the as-cast melt-spun ribbons was ~900 HV due to a fine martensite-austenite mixture surrounded by 3-dimensional skeleton-like primary carbides of length scale 0.2-0.3 µm. The suction-injection cast method led to a similar structure but less hard (780 HV) due to a lower cooling rate. The thixoformed material showed unmelted globular fine grains and a eutectic mixture formed directly from the liquid phase. The variety of processed steel samples were tempered and their microstructures examined.

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Section: Microstructural Stability As a Function Of Production Methodsmentioning

confidence: 65%

“…The work may in addition reveal the role of parameters, such as the cooling rate, for alternative processing methods, as evidenced by a recent study on the feasibility of thixoforming nanostructured bainitic steels. 11 Experimental procedure…”

Section: Introductionmentioning

confidence: 99%

Melt-spinning and semi-solid processing of bainitic steel

Rogal

Solano-Alvarez

Bhadeshia

2017

Materials Science and Technology

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“…Al, Mg alloys or only aging, 28,30 in the case of steel hardening with tempering, only tempering, or controlled cooling from SSM temperature range to bainitic temperatures. 38,40,48,49 However, further work must be carried out in order to understand better the changes in the microstructure after SSM and, as a result, to improve the properties of thixo-casts.…”

Section: Introductionmentioning

confidence: 99%

Critical assessment: Opportunities in developing semi-solid processing: Aluminium, magnesium, and high-temperature alloys

Rogal

2017

Materials Science and Technology

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Semi-solid metal processing (SSM) is a modern metal forming technology offering net-shape metal components of complex geometry in a one-step operation. The process relies on the thixotropic behaviour of metals with non-dendritic microstructures in a wide semi-solid temperature range. The beneficial effects are currently exploited in aluminium and magnesium alloys. This alternative manufacturing route to casting and forging has generated high expectations regarding high melting alloys, although no conclusive results have been achieved so far. Current studies focus on a deep understanding of the fundamental basics of alloys in the semisolid range, e.g. rheology, microstructural evolution, and the consequences of forming, e.g. relations between process parameters, microstructure, and properties. This critical assessment aims at defining the important needs for further development of SSM, and assessing current knowledge.

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