Overlapping tracks processed by TIG melting TiC preplaced powder on low alloy steel surfaces

Mridha, S.; Baker, T. N.

doi:10.1179/1743284714y.0000000530

Cited by 33 publications

(23 citation statements)

References 47 publications

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“…Wang et al 16 concluded that the low density of TiC, ~4.90 g/cm 3 , compared with iron, ~8.9 g/cm 3 , had a tendency to segregate in the upper region. However, it should be noted that compared with the energy input 422 J mm -1 used in previous research 26 and 1344 J mm -1 in the present work, their energy input was 2550 J mm -1 . Their precipitates, which were significantly larger than those seen in Fig.…”

Section: 4 25mentioning

confidence: 61%

“…This paper extends the work reported in a previous paper. 26 It describes the influence of multipass overlapping tracks processed using TiC powder preplaced on AISI 4340 low alloy steel and melted under a TIG torch, but using a higher energy input, with the aim of dissolving particulates and precipitating more TiC in a finer form, with a homogeneous distribution. Research was undertaken to characterize the multipass overlapping features such as the melt geometry, microhardness and microstructure, including defects, of the processed tracks.…”

Section: -26mentioning

confidence: 99%

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Melting of multipass surface tracks in steel incorporating titanium carbide powders

Mridha

Idriss

Maleque

et al. 2015

Materials Science and Technology

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Overlapping tracks were processed by melting preplaced titanium carbide (TiC) powder on steel surfaces using a tungsten inert gas torch. The tracks produced ~1.0 mm melt depth free from cracks, but occasional pores were observed. The microstructure consisted of unmelted and partially melted TiC particulates together with reprecipitated TiC particles, which were prominent in tracks processed in the initial stage. A greater number of reprecipitated globular and cubic TiC particles were observed in tracks processed in the later stages, indicating more dissolution of TiC particulates from the overlapping operation. Those multitracks processed in the initial stage developed a maximum hardness of 850-1000 HV, which was lower in most other tracks, although comparable hardness values were recorded in the last track.

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Section: 4 25mentioning

confidence: 61%

Section: -26mentioning

confidence: 99%

Melting of multipass surface tracks in steel incorporating titanium carbide powders

Mridha

Idriss

Maleque

et al. 2015

Materials Science and Technology

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“…Furthermore, when a number of overlapping tracks are laid down to cover the surface, differences in microstructures have been reported to produce changes in hardness through the melt depth. For example, temperature increases greater than 500°C have been recorded between the first and final tracks for both titanium alloys [11,12] and steels [13,14]. These changes can also influence the surface roughness.…”

Section: Introductionmentioning

confidence: 99%

Effect of shielding gas on the properties and microstructure of melted steel surface using a TIG torch

Escalona

Mridha

Baker

2015

Advances in Materials and Processing Technologies

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This version is available at https://strathprints.strath.ac.uk/49507/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Strathprints administrator: strathprints@strath.ac.ukThe Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output. Abstract. A surface engineering technique based on a Tungsten Inert Gas (TIG) torch was used to melt single tracks on the surface of a micro-alloyed steel with a hardness of 150 HV. The influence of three shielding gases, argon, helium and nitrogen, on the microstructure and hardness of the resolidified surfaces was analyzed. Effect of Shielding Gas on the Properties andIn all melting techniques, the heat generated by the source is normally conducted to the substrate ahead of the torch, and has been described as 'preheat'. This leads to a gradually higher substrate temperature, from the start to the finish of a melted surface track. The aim of this research was to analyze any inhomogeneities in the microstructure, due to 'preheat', which is rarely considered in the published literature. Three thermocouples were located along the melted track in order to record the temperature at three different points. An energy input of ~ 840J/mm was used in each experiment and the results show that the maximum temperature recorded by the last thermocouple, N o three (subjected to the preheat), for argon, helium and nitrogen gas was 590 ºC, 1120º C and 740 ºC respectively, where a difference of 150 ºC and 200 ºC was registered between the first and third thermocouples when using helium and nitrogen respectively. The corresponding hardness values were 170 HV, 162 HV and 225 HV, and the corresponding surface roughness values were 6 µm, 12 µm and 25µm. A decrease of almost 60% in the roughness value was observed between the initial and last stage of the melted track, when using argon as shielding gas.

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“…Recently, various studies have concentrated on (TiC-Al [11]. In recent years, several research groups have shown interest in GTAW coating/alloying by using TiC as reinforcement on various substrate materials like 1020 steel [12], AISI4340 [13], AISI304, and 1020 [14]. Chatterjee et al [13] integrated the SHS and the laser-welding processes to coat Al 2 O 3 -TiB 2 -TiN composite on the surface of soft steel.…”

Section: Introductionmentioning

confidence: 99%

In-situ fabrication of TiC-Al2O3 and TiB2-TiC-Al2O3 composite coatings on 304 stainless steel surface using GTAW process

Bahramizadeh¹,

Nourouzi²,

Aval³

2020

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The purpose of this study was to improve the performance of 304 stainless steel by applying a wear-resistant coating. For this purpose, in-situ composite coatings of TiC-Al2O3, as well as TiB2-TiC-Al2O3, were applied on the surface of 304 stainless steel by using combining, welding and self-combustion synthesis with different current welding. The microstructural investigations of the coated layers showed that due to the high incoming welding temperature in all the samples, by performing the combustion synthesis reaction, significant reinforcing particles were formed on the 304 stainless steel surface. Also, in all heat inputs, cubic titanium carbide particles formed inhomogeneously on Al2O3 particles or spontaneously in the austenitic matrix of 304 stainless steel. The reinforcing of TiC and TiB2 particles formation in both 3TiO2-4Al-3C and 3TiO2-4Al-B4C layers led to an increase in surface hardness and wear resistance up to 2.5 versus the substrate.

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Overlapping tracks processed by TIG melting TiC preplaced powder on low alloy steel surfaces

Cited by 33 publications

References 47 publications

Melting of multipass surface tracks in steel incorporating titanium carbide powders

Melting of multipass surface tracks in steel incorporating titanium carbide powders

Effect of shielding gas on the properties and microstructure of melted steel surface using a TIG torch

In-situ fabrication of TiC-Al2O3 and TiB2-TiC-Al2O3 composite coatings on 304 stainless steel surface using GTAW process

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