Microstructure and hardness characterization of mechanically alloyed Fe–C elemental powder mixture

Hussain, Zuhailawati; Geok, Tan Chew; Basu, Projjal

doi:10.1016/j.matdes.2009.10.034

Cited by 16 publications

(22 citation statements)

References 11 publications

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“…The indentation hardness and modulus has been shown to be in a good agreement with the bulk properties of the compacts and can be used as an easy and quick way of studying processing parameters on the properties [9,13]. In addition, correlations between the microstructure and resulted indentation hardness/modulus can be made and effect of alloying and other elements addition can be readily inspected [10,12].…”

Section: Introductionmentioning

confidence: 82%

“…Hardness test and instrumented indentation has emerged as an accessible and practical route for measuring mechanical properties of compacts [9][10][11][12][13]. The indentation hardness and modulus has been shown to be in a good agreement with the bulk properties of the compacts and can be used as an easy and quick way of studying processing parameters on the properties [9,13].…”

Section: Introductionmentioning

confidence: 99%

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A practical route for the characterization of zinc powder compacts with the aid of instrumented indentation and scratch tests

Tehrani¹,

Al-Haik²,

Dyck³

et al. 2010

Materials Science and Engineering: A

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Section: Introductionmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

A practical route for the characterization of zinc powder compacts with the aid of instrumented indentation and scratch tests

Tehrani¹,

Al-Haik²,

Dyck³

et al. 2010

Materials Science and Engineering: A

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“…Several studies show that the milling time is one of the most effective mechanical alloying parameters on accomplishing the desired structure and properties. A number of research groups have used different mill type and ball-to-powder mass ratio to study the influence of milling time on the microstructural evolution, density, and hardness of Fe-C alloys [6,7,9,[11][12][13][14][15][52][53][54] it is summarized here.…”

Section: The Effect Of Milling Timementioning

confidence: 99%

“…MA makes it possible to process iron-carbon alloys with ultra-high carbon concentrations with very fine microstructure and excellent properties [4][5][6]. Literature shows that the final Fe-C alloys structures and properties are controlled by the starting composition and MA parameters [7]. Among the MA parameters, milling time is one of the most effective in accomplishing the desired structure and properties [8].…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Milling Time on the Structure and Properties of Mechanically Alloyed High Carbon Iron-Carbon Alloys

Khalfallah

Aning

2019

Reference Module in Materials Science and Materials Engineering

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The effects of mechanical alloying milling time and carbon concentration on microstructural evolution and hardness of high-carbon Fe-C alloys were investigated.Mechanical alloying and powder metallurgy methods were used to prepare the samples. Mixtures of elemental powders of iron and 1.4, 3, and 6.67 wt.% pre-milled graphite were milled in a SPEX mill with tungsten milling media for up to 100h. The milled powders were then coldcompacted and pressure-less sintered between 900°C and 1200°C for 1h and 5h followed by furnace cooling. Milled powders and sintered samples were characterized using X-ray diffraction, differential scanning calorimetry, Mossbauer spectroscopy, scanning and transmission electron microscopes. Density and micro-hardness were measured. The milled powders and sintered samples were studied as follows:In the milled powders, the formation of was observed through Mossbauer spectroscopy after 5h of milling and its presence increased with milling time and carbon concentration. The particle size of the milled powders decreased and tended to become more equi-axed after 100h of milling. Micro-hardness of the milled powders drastically increased with milling time as well as carbon concentration. A DSC endothermic peak around 600°C was detected in all milled powders, and its transformation temperature decreased with milling time.In the literature, no explanation was found. In this work, this peak was found to be due to the formation of phase. A DSC exothermic peak around 300°C was observed in powders milled for 5h and longer; its transformation temperature decreased with milling time. This peak was due to the recrystallization and/or recovery α-Fe and growth of .In the sintered samples, almost 100% of pearlitic structure was observed in sintered samples prepared from powders milled for 0.5h. The amount of the pearlite decreased with milling time, contrary to what was found in the literature. The decrease in pearlite occurred at the same time as an increase in graphite-rich areas. With milling, carbon tended to form graphite instead of . Longer milling time facilitated the nucleation of graphite during sintering. High mount of graphite-rich areas were observed in sintered samples prepared from powders milled for 40h and 100h. Nanoparticles of were observed in a ferrite matrix and the graphite-rich areas in samples prepared from powders milled for 40h and 100h. Micro-hardness of the sintered samples decreased with milling time as decreased. The green density of compacted milled powders decreased with milling time and the carbon concentration that affected the density of sintered samples. Abstract The effects of milling time and carbon composition of the alloy on microstructural evolution and hardness of high-carbon Fe-C alloys were investigated. Mixtures of elemental powders of iron and 1.4, 3, and 6.67 wt.% nano graphite were milled, pressed and the sintered between 900°C and 1200°C for 1h and 5h. Milled powders and sintered samples were characterized. Density and hardness were measured. The milled powders...

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Structure and Magnetic Properties of Mechanically Alloyed Fe90Al8C2 (wt.%) Powders

Lemdani

Alleg

Mechri

et al. 2022

J Supercond Nov Magn

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Microstructure and hardness characterization of mechanically alloyed Fe–C elemental powder mixture

Cited by 16 publications

References 11 publications

A practical route for the characterization of zinc powder compacts with the aid of instrumented indentation and scratch tests

A practical route for the characterization of zinc powder compacts with the aid of instrumented indentation and scratch tests

The Effect of Milling Time on the Structure and Properties of Mechanically Alloyed High Carbon Iron-Carbon Alloys

Structure and Magnetic Properties of Mechanically Alloyed Fe90Al8C2 (wt.%) Powders

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