New Cast Iron Alloys with High Wear Resistance at Elevated Temperatures

Abstract White cast iron with about 12.7 wt.-% chromium was alloyed with Ni, W and Mo for heat treatment applications. Heat treatments were performed at a range of 850-1050 °C for 1 h in order to distribute M7C3 carbides homogeneously in an environment of high wear resistance. The contents of the C, Cr, Ni, Mo, Mn and Si elements selected for the alloys were similar, though a 6 wt.-% nickel concentration was chosen. Microstructural changes in the specimens were examined by scanning electron microscopy (SEM) and optical microscopy (OM). Macro-hardness, average carbide size and volume fraction were analyzed. Wear tests were carried out under different loads of 10, 20 and 30 N. It was seen that heat treatment changed the carbide size and homogeneous distribution of the carbides. Moreover, the addition of nickel to HCrWCI increased fracture toughness and reduced the wear rate.

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High Wear Resistance of White Cast Iron Treated by Novel Process: Principle and Mechanism

Metallurgical and Materials Transactions A ◽

10.1007/s11661-015-3137-4 ◽

2015 ◽

Vol 46 (12) ◽

pp. 5514-5525 ◽

Cited By ~ 8

Author(s):

Xiaoshuai Jia ◽

Xunwei Zuo ◽

Yu Liu ◽

Nailu Chen ◽

Yonghua Rong

Keyword(s):

Wear Resistance ◽

Cast Iron ◽

White Cast Iron ◽

High Wear Resistance

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Effect of Microstructure of Fe-C-V Alloys on Selected Functional Properties

Archives of Foundry Engineering ◽

10.2478/afe-2014-0057 ◽

2014 ◽

Vol 14 (3) ◽

pp. 33-36 ◽

Cited By ~ 2

Author(s):

M. Kawalec ◽

J. Kozana

Keyword(s):

Wear Resistance ◽

Cast Iron ◽

Chemical Composition ◽

White Cast Iron ◽

High Wear Resistance ◽

Cast Alloys ◽

Vanadium Carbides ◽

Good Workability ◽

Conventional Machining ◽

Very High

Abstract The cast alloys crystallizing in Fe-C-V system are classified as white cast iron, because all the carbon is bound in vanadium carbides. High vanadium cast iron has a very high abrasion resistance due to hard VC vanadium carbides. However, as opposed to ordinary white cast iron, this material can be treated using conventional machining tools. This article contains the results of the group of Fe-C-V alloys of various microstructure which are been tested metallographic, mechanical using an INSTRON machine and machinability with the method of drilling. The study shows that controlling the proper chemical composition can influence on the type and shape of the crystallized matrix and vanadium carbides. This makes it possible to obtain a high-vanadium cast iron with very high wear resistance while maintaining a good workability.

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Heat treatment T4 and T6 effects on the tribological properties of sillimanite mineral-reinforced LM30 aluminium alloy composites at elevated temperatures

Proceedings of the Institution of Mechanical Engineers Part J Journal of Engineering Tribology ◽

10.1177/13506501211036543 ◽

2021 ◽

pp. 135065012110365

Author(s):

Sandeep Sharma ◽

Tarun Nanda ◽

OM Prakash Pandey

Keyword(s):

Heat Treatment ◽

Wear Resistance ◽

Cast Iron ◽

Coefficient Of Friction ◽

Elevated Temperatures ◽

Wear Behaviour ◽

Matrix Composites ◽

Heat Treated ◽

Wear And Friction ◽

Grey Cast

The present study investigates effect of heat treatment on wear and friction behaviour of sillimanite/LM30 aluminium matrix composites at elevated temperatures (50–300 °C). The composites were prepared using a stir-casting process. Composites were reinforced with 3–15 wt.% sillimanite particle sizes of fine (1–20 μm):coarse (75–106 μm) in the ratio of 1:3, 1:1 and 3:1, respectively. Next, the composites were subjected to T4 and T6 heat treatment. For T4 heat treatment, composites were heated at 550 °C for 1 h, water quenched and naturally aged (at room temperature) for 480 h. Further, for T6 heat treatment composites were artificially aged at 200 °C for 4 h and air cooled. Hardness of composites improved with increase in particle weight percentage and increases in the ratio of fine particles in the mix. Maximum improvement in hardness was observed for 15 wt.% T6 heat-treated composites with fine:coarse in the ratio of 3:1. The addition of sillimanite particles improved wear resistance and coefficient of friction of the composites. Wear and friction analysis revealed that beyond 200 °C, wear behaviour of composites changed from mild to severe. Further, the heat treatment of composites improved wear resistance and coefficient of friction. Wear rate and friction coefficient of T6 heat-treated 15 wt.% composite with fine:coarse as 3:1 at 200 °C decreased by 70% and 52%, respectively. X-ray diffraction of wear tracks and wear debris of T6 heat-treated composites revealed the formation of intermetallics and oxides on the wornout surface of the composites. Scanning electron microscopy analysis of wear tracks and debris revealed that at elevated temperatures, abrasive and adhesive wear was dominant for the material removal mechanism. The developed composites exhibited nearly wear behaviour similar to that of grey cast iron used in brake rotors. Thus, sillimanite/LM30 aluminium matrix composites provide a suitable substitute to replace heavy grey cast iron components used in automobile industry.

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Superior wear performances of one-step forming TiCp/Ni3Al-Ni3Al multi-coating on powder metallurgy master alloy substrate

Proceedings of the Institution of Mechanical Engineers Part J Journal of Engineering Tribology ◽

10.1177/1350650118803822 ◽

2018 ◽

Vol 233 (5) ◽

pp. 782-790

Author(s):

Zirun Yang ◽

Benguo Zhang ◽

Haiqing Jiang ◽

Haidi Xia ◽

Xinjiang Zhang ◽

...

Keyword(s):

Weight Loss ◽

Wear Resistance ◽

Powder Metallurgy ◽

Elevated Temperatures ◽

Steel Substrate ◽

High Wear Resistance ◽

High Temperature Strength ◽

Ambient Temperatures ◽

Wear Weight Loss ◽

One Step

One-step forming TiCp/Ni3Al-Ni3Al multi-coating on powder metallurgy 316L stainless steel substrate was fabricated by vacuum hot-pressing sintering technology and its wear performances at different loads and ambient temperatures were investigated. The wear weight loss of TiCp/Ni3Al-Ni3Al multi-coating increased with the increase in the applied load and a mild-to-severe wear transition occurred. Inversely, the coating’s wear weight loss decreased as the ambient temperature increased. The high wear resistance at elevated temperatures was mainly attributed to high work-hardening capacity and high temperature strength of Ni3Al matrix. Besides, the mechanically mixed layer with dispersed TiC particulates prevented the substrate from plastic deformation and thermal softening, which were conducive to improve the wear resistance of the coating.

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Increasing Wear Resistance of Chizel Tools Working Bodies Based on Improving the Metallographic Structure of Grey Cast Iron

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.299.652 ◽

2020 ◽

Vol 299 ◽

pp. 652-657

Author(s):

Vadim A. Motorin ◽

Ludmila V. Kostyleva ◽

Dmitry S. Gapich

Keyword(s):

Wear Resistance ◽

Cast Iron ◽

Soil Layer ◽

Grey Cast Iron ◽

High Wear Resistance ◽

Metal Base ◽

Mold Making ◽

Grey Cast ◽

Working Bodies ◽

The Given

The article concerns developing and implementing the technological principles for manufacturing the working bodies of chisel tools by casting grey cast iron with partial chilling of its working edges and surfaces interacting with the soil layer. High wear resistance of the working body is achieved by chilling its working part by means of a chill inserted into the mold, or by absence of coating in the corresponding zone of the mold. Severe overcooling of liquid cast iron contacting the chill or the metal surface of the mold causes crystallization of the meta-stable eutectics, and in the chilled part it acquires a ledeburite structure, the hardness being not lower than 64 HRC. At the same time, the bulk of the cast iron crystallizes in the stable system, forming austenitic-graphite eutectics and after complete cooling, it should have a pearlitic metal base, ensuring good machine ability of casting by cutting. Working surfaces and cutting edges of chisels are exposed to abrasive and chemical impacts of the soil, causing intense wear, the latter being the main reason for their failure. The utilization of the given technology will allow increasing service-life of the working bodies and improve the manufacturability, according to the criteria for labor intensity and casting mold making.

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Toughening Study on High Chromium Cast Iron Liner Plates of HZS Series Commercial Concrete Mixing Plant

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.179-180.1338 ◽

2011 ◽

Vol 179-180 ◽

pp. 1338-1341

Author(s):

Jiang Liu ◽

Jun Fu

Keyword(s):

Wear Resistance ◽

Cast Iron ◽

Impact Toughness ◽

Normal Operation ◽

High Wear Resistance ◽

Liner Material ◽

High Chromium ◽

High Chromium Cast Iron ◽

The Impact ◽

Chromium Cast Iron

Because of high wear resistance and low cost, high chromium cast iron liner plate is the most commonly used liner for HZS series concrete mixing station at present. However, in normal operation, the high-chromium cast iron liner produced by conventional casting process is easy to crack at its corners. We found that the cracking reasons of this type of liner plate are mainly the lower cast impact toughness, slightly higher hardness, and there has not gotten a good matching between the hard particles and the matrix organizations. Thus we used the secondary heat treatment to slightly reduce the hardness and increase the impact toughness of cast iron liner plate, which can improve the wear resistance and impact resistance of the liner material to extend the service life of these cast iron liners.

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