Influence of multiple nitriding on the case hardening of H13 tool steel: experimental and numerical investigation

Akhtar, Syed Sohail; Arif, Abul Fazal M.; Yilbaş, Bekir Sami

doi:10.1007/s00170-011-3387-2

Cited by 25 publications

(7 citation statements)

References 9 publications

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“…Simple reactions from our everyday life involve oxidation of steel or copper, as can be seen in cars and copper roofing, respectively. Steel hardening can involve nitridation of low-carbon steel to enhance its mechanical properties (Meka et al, 2016;Akhtar et al, 2012). For energy storage, hydrogen is expected to play a crucial role, and the materials involved are carefully designed nano-sized crystallites, which can absorb and desorb hydrogen through a controlled process (Sakintuna et al, 2007;Zü ttel, 2004).…”

Section: Introductionmentioning

confidence: 99%

Air-heated solid–gas reaction setup for in situ neutron powder diffraction

Ahlburg

Canévet²,

Christensen

2019

J Appl Cryst

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The design and function of a reduction furnace, specially designed for solid-gas in situ monochromatic angular dispersive neutron powder diffraction, is presented. The functionality is demonstrated by performing a reduction experiment of CoFe 2 O 4 nanoparticles at the instrument DMC at SINQ. Heating is provided by an air gun, allowing the sample to reach temperatures in the range of 300-973 K within less than 5 min. The setup is based on a single-crystal sapphire tube with one end closed. A ' scan of the tube reveals its single-crystal nature, through strong single-crystal reflections, while the remaining background is very low, uniform and flat. CoFe 2 O 4 was reduced using a time resolution of 8 min and a sample volume of $2 cm 3 . By means of sequential Rietveld refinement of the in situ neutron diffraction data, a two-step reduction mechanism was discovered: CoFe 2 O 4 ! Co 0.33 Fe 0.67 O ! CoFe 2 . The setup offers high temperatures, fast temperature stability, large sample volumes and respectable time resolution. The setup has proven to be ideal to carry out investigations of advanced materials under realistic conditions. The ability to investigate real materials in real time under realistic conditions may be a significant advantage for scientific investigations as well as for industrial applications.

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Section: Introductionmentioning

confidence: 99%

Air-heated solid–gas reaction setup for in situ neutron powder diffraction

Ahlburg

Canévet²,

Christensen

2019

J Appl Cryst

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“…Horak et al 9) proposed a mathematical model for predicting the microhardness of the nitrided steel, and compared this model with the experimental results in relation to the atmosphere gas temperatures and pressures. The hardness of the nitriding layer was measured with respect to time and temperature, and it was found that a multi-nitriding method could improve the hardness of the nitriding layer 10,11) . In addition, a number of factors such as nitriding po-tential, carburizing potential, process temperature, and process time were analyzed to enhance the quality of the heat treatment under different operating conditions for the nitriding and nitrocarburizing processes 12,13) .…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Influence of Fan Speed and Swirling Gas Injection on Thermal-Flow Characteristics in Nitrocarburizing Furnace

2017

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This study was carried out to analyze the ow and heat transfer characteristics in a furnace, and to evaluate the in uence of the two major design factors for improving the ow mixing and heat transfer. The grid system was constructed using ANSYS ICEM (V.17.0), and numerical simulations were conducted using the commercial CFD code (ANSYS Fluent V.17.0). The fan plays an important role in ow mixing and convective heat transfer in the furnace. Accordingly, temperature uniformity was improved with an increase in the fan speed owing to an enhancement of the convective heat transfer. Moreover, when swirl ow was applied to the inlet gas, temperature uniformity was improved in the lower section of the furnace. This is because the swirl ow of the inlet gas improved the ow mixing in the vicinity of the gas inlet where it is not affected by the rotational force of the fan. Controlling the swirl intensity of the inlet gas with lower fan speeds is more energy ef cient because ow mixing and temperature uniformity could be improved suf ciently.

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“…The failure of high temperature tools includes mainly hot-wear, oxidation and hot-fatigue, all of which are related to the high-temperature thermal stability of the alloy surface (Li et al , 1998; Yu et al , 2007). Depending upon the principle and process, methods of strengthening the surface can be considered under four main categories: surface plastic deformation, surface heat treatment, surface chemical heat treatment and surface coating strengthening (Ulutan et al , 2010; Akhtar et al , 2012; Tong et al , 2013). Fe-based, Ni-based and Co-based metal matrix alloy coatings have been developed in which hard carbide particles are embedded to improve strength (Yang et al , 2003; Zhu et al , 2012; Bartkowski et al , 2015).…”

Section: Introductionmentioning

confidence: 99%

Improving the high-temperature oxidation resistance of H13 steel by laser cladding with a WC/Co-Cr alloy coating

Zhang

Jie

Zhang

et al. 2016

ACMM

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Purpose This paper aims to discuss that a WC/Co-Cr alloy coating was applied to the surface of H13 steel by laser cladding. Design/methodology/approach The oxidation behavior of the WC/Co-Cr alloy coating at 600Â°C was investigated by comparing it with the performance of the steel substrate to better understand the thermal stability of H13 steel. Findings The results showed that the WC/Co-Cr alloy coating exhibited better high-temperature oxidation resistance and thermal stability than did uncoated H13 steel. The coated H13 steel had a lower mass gain rate and higher microhardness than did the substrate after different oxidation times. Originality/value The WC/Co-Cr alloy coating was composed of e-Co, CW3, Co6W6C, Cr23C6 and Cr7C3; this mixture offered good thermal stability and better high-temperature oxidation resistance.

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Influence of multiple nitriding on the case hardening of H13 tool steel: experimental and numerical investigation

Cited by 25 publications

References 9 publications

Air-heated solid–gas reaction setup for in situ neutron powder diffraction

Air-heated solid–gas reaction setup for in situ neutron powder diffraction

Numerical Investigation on Influence of Fan Speed and Swirling Gas Injection on Thermal-Flow Characteristics in Nitrocarburizing Furnace

Improving the high-temperature oxidation resistance of H13 steel by laser cladding with a WC/Co-Cr alloy coating

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