A Review on Thixoforming of High Melting Point Alloys

Rassili, Ahmed

doi:10.4028/www.scientific.net/ssp.256.228

Cited by 8 publications

(3 citation statements)

References 50 publications

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“…From then on, several authors have assessed the manufacturing of different complex geometries [9,10] and even special alloys were manufactured to enhance the SSP working window and reduce the working temperature [11]. However, they observed premature die degradation, which among others, hindered the possible industrialization [12,13].…”

Section: Introductionmentioning

confidence: 99%

Preliminary Study on the Capability of the Novel Near Solidus Forming (NSF) Technology to Manufacture Complex Steel Components

et al. 2020

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The benefits of the novel Near Solidus Forming (NSF) process has shown previously in its ability to produce steel components with comparable as-forged mechanical properties but with a cost reduction of 10–15%. This study further pushes the NSF technology to produce parts that are conventionally difficult to produce via conventional methods. A 2.7 kg 42CrMo4 steel grade component was manufactured into a complex geometry using only a 400t press. Different manufacturing parameters were evaluated to show their influence on the process and final component. A combination of X-ray fluorescence (XRF), optical microscopy and SEM analysis of the microstructure was also conducted revealing the deformation pattern of the material and shedding some light on how the material evolves during the process. The successful forging of these components shows the capability to produce previously deemed difficult geometries, with much a lower specification forging press, in a single deformation.

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Section: Introductionmentioning

confidence: 99%

Preliminary Study on the Capability of the Novel Near Solidus Forming (NSF) Technology to Manufacture Complex Steel Components

et al. 2020

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“…The semi-solid product has been successfully used in the field of 5G communication base station thin-walled components, etc [4] . However, the industrial development of semi-solid high melting alloys such as steel is faced with problems in theory and technology [5,6] . Semi-solid processing of steel still remains in the research stage in lab.…”

Section: Introductionmentioning

confidence: 99%

Phase Transformation of M2 High Speed Steel during Semi-Solid Cooling and Conventional Cooling

Sun

Wang

Song

et al. 2022

SSP

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In this paper, the fundamental microstructure evolution of M2 high speed steel was investigated during semi-solid controlled cooling and conventional cooling, respectively. Semi-solid controlled cooling was conducted at 1260 °C with cooling rates from 0.1 to 10 °C/s, while conventional cooling was conducted at 1200 °C and 890 °C with different cooling rates. The continuous cooling transformation curves were plot according to the microstructure evolution. The results showed that microstructure transformation behavior of cooling structure in semi-solid temperature range was different from that of conventional process. For semi-solid specimen, the solid austenite dissolved more alloy elements, and the austenite stability was increased. The solid matrix was pearlite structure in the samples with cooling rate of 0.1 °C /s. When the cooling rate reached 1 °C/s, the granular pearlite disappeared and martensite lath was formed. The structure was relatively uniform, on which there were large carbide with regular shape. The solidified liquid phase showed a network shape surrounding the solid particles. The size of solid particles showed a decreasing trend with the increase of cooling rates. For conventional cooling process, the large eutectic M6C carbide and the small precipitated MC carbide could not be dissolved by austenitized at 890 °C. Increasing the austenitization temperature helped dissolving part of the carbides. The hardenability of M2 steel was high. The hardness has increased to a high level for both semi-solid and conventional specimens when cooling rate reached 1 °C/s. No obvious increase happened when cooling rate continued increasing.

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“…In the latter case, at nearly 90% volume of solids, the main idea was to move closer to forging properties reducing the liquid phase and the working temperatures. Based on this perspective, various components were manufactured [7][8][9]. Nevertheless, neither the mechanical properties nor the die lifetime results were successful.…”

Section: Introductionmentioning

confidence: 99%

Near Solidus Forming (NSF): Semi-Solid Steel Forming at High Solid Content to Obtain As-Forged Properties

Lozares

Plata

Hurtado

et al. 2020

Metals

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Near solidus forming (NSF) of steels is a novel process under the umbrella of semi-solid forming technologies midway between classical hot forging and semi-solid technologies. This article presents the work done at Mondragon Unibertsitatea to develop this technology and demonstrates the great potential of the NSF process. The study proves the capability of the process to reduce raw material consumption by 20%, reduce forming loads from 2100 t to 300 t, and reduce forming steps from three to one, to obtain as-forged mechanical properties, as well as the excellent repeatability of the process. The work demonstrates that manufacturing commercial steel components in a single step using several off-the-shelf alloys is possible thanks to the flowing pattern of the material, which enables near-net shaping. In the first part of the article, a general overview of the semi-automated near solidus forming cell, together with a description of the NSF manufacturing trials, is provided, followed by the presentation and discussion of the results for the selected steel alloys.

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A Review on Thixoforming of High Melting Point Alloys

Cited by 8 publications

References 50 publications

Preliminary Study on the Capability of the Novel Near Solidus Forming (NSF) Technology to Manufacture Complex Steel Components

Preliminary Study on the Capability of the Novel Near Solidus Forming (NSF) Technology to Manufacture Complex Steel Components

Phase Transformation of M2 High Speed Steel during Semi-Solid Cooling and Conventional Cooling

Near Solidus Forming (NSF): Semi-Solid Steel Forming at High Solid Content to Obtain As-Forged Properties

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