Effect of bulk heat treatment and plasma surface hardening on the microstructure and erosion wear resistance of complex-alloyed cast irons with spheroidal vanadium carbides

2017 ◽  
Vol 38 (1) ◽  
pp. 58-64 ◽  
Author(s):  
V. G. Efremenko ◽  
K. Shimizu ◽  
T. V. Pastukhova ◽  
Yu. G. Chabak ◽  
K. Kusumoto ◽  
...  
2021 ◽  
Vol 303 ◽  
pp. 01005
Author(s):  
Dmitry Lubyanoi ◽  
Evgeny Pudov ◽  
Evgeny Kuzin ◽  
Olga Semenova

The article shows the relevance of the use of alloyed cast iron in mining and metallurgical engineering. The article discusses the technologies for producing naturally alloyed cast iron. For working bodies and friction units of mining machines, such as pumps, coal pumps, hydrocyclones, crushers and mills. The main type of wear for them is abrasive. To increase the wear resistance of cast iron the production of cast iron has not been sufficiently studied yet. Although the use of cast iron in a complex alloyed with manganese, silicon, chromium, titanium and vanadium has been studied. The article studies the influence of manganese, titanium and vanadium on the mechanical properties and performance of machine parts and products of mining and metallurgical production in contact with high-temperature and highly abrasive media. The rational content of titanium and vanadium in gray cast irons is established in the range of 0.05-0.1%, which ensures their heat resistance and increases their wear resistance. The content of these elements can be increased to 0.07-0.12%. Bushings made of this cast iron have the required wear resistance and can increase the operational reliability of the equipment in the conditions of mining and metallurgical production. They also replace non-ferrous metals, as well as products obtained by powder metallurgy methods.


2016 ◽  
Vol 58 (4) ◽  
pp. 306-311 ◽  
Author(s):  
Enbiya Türedi

1968 ◽  
Vol 10 (5) ◽  
pp. 389-391
Author(s):  
A. N. Volkov ◽  
V. B. Lyadskii ◽  
D. I. Stanchev

Wear ◽  
2011 ◽  
Vol 271 (9-10) ◽  
pp. 1813-1818 ◽  
Author(s):  
E. Albertin ◽  
F. Beneduce ◽  
M. Matsumoto ◽  
I. Teixeira

2010 ◽  
Vol 457 ◽  
pp. 249-254 ◽  
Author(s):  
Naoji Yoneta ◽  
Kazumichi Shimizu ◽  
Hiroya Hara ◽  
Masahito Tanaka ◽  
Yoshihiro Nawa

Spheroidal carbides cast irons (SCIs) are used in severe conditions where often occur erosion and due to their excellent wear resistance characteristics. In this study, three kinds of SCIs with a variation in matrices are tested and evaluated as shredding blade of uniaxial rotary glass shredder in recycling factories where often occurs extreme abrasion with the crushed glass. They are SCI-VCrNi, SCI-VMn, and SCI-Vw with hard (2400Hv) spheroidal vanadium carbides (VC). As a result, SCI-Vw reveals excellent wear resistance, approximately 1/12 of wear removal in weight, compare to other two materials of SCI-VCrNi and SCI-VMn. Spheroidal carbides nodularity(70%) and volume fraction of VCs(approximately 20%) are similar in three kinds of SCIs. The hardness of matrix of SCI-Vw (800Hv) is greater than that of SCI-VCrNi (320Hv) and SCI-VMn (380Hv). Therefore the experimental results are interpreted that hardness of matrix are dominant factor for abrasion. Based on this experimental study, SCI-Vw is an effective material for abrasion occurred on the blade of the glass shredder.


2012 ◽  
Vol 55 (1) ◽  
pp. 86-90 ◽  
Author(s):  
Xiulin Ji ◽  
Shunzhen Yang ◽  
Jianhua Zhao ◽  
Chunyan Yan ◽  
Liangfeng Jiang

10.30544/238 ◽  
2017 ◽  
Vol 23 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Kamran Amini ◽  
Amin Akhbarizadeh ◽  
Sirus Javadpour

The deep cryogenic heat treatment is an old and effective heat treatment, performed on steels and cast irons to improve the wear resistance and hardness. This process includes cooling down to the liquid nitrogen temperature, holding the samples at that temperature and heating at the room temperature. The benefits of this process are significant on the ferrous materials, but recently some studies focused on other nonferrous materials. This study attempts to clarify the different behavior of some materials subjected to the deep cryogenic heat treatment, as well as explaining the common theories about the effect of the cryogenic heat treatment on these materials. Results showed that polymers exhibit different behavior regarding to their crystallinity, however the magnesium alloys, titanium alloys and tungsten carbide show a noticeable improvement after the deep cryogenic heat treatment due to their crystal structure.


Metals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1487
Author(s):  
Won-Sang Shin ◽  
Hyun Jong Yoo ◽  
Jeoung Han Kim ◽  
Jiyeon Choi ◽  
Eun-Joon Chun ◽  
...  

Laser heat-treatment and laser nitriding were conducted on an AISI P21 mold steel using a high-power diode laser with laser energy densities of 90 and 1125 J/mm2, respectively. No change in surface hardness was observed after laser heat-treatment. In contrast, a relatively larger surface hardness was measured after laser nitriding (i.e., 536 HV) compared with that of the base metal (i.e., 409 HV). The TEM and electron energy loss spectroscopy (EELS) analyses revealed that laser nitriding induced to develop AlN precipitates up to a depth of 15 μm from the surface, resulting in surface hardening. The laser-nitrided P21 exhibited a superior wear resistance compared with that of the base metal and laser heat-treated P21 in the pin-on-disk tribotests. After 100 m of a sliding distance of the pin-on-disk test, the total wear loss of the base metal was measured to be 0.74 mm3, and it decreased to 0.60 mm3 for the laser-nitrided P21. The base metal and laser heat-treated P21 showed similar wear behaviors. The larger wear resistance of the laser-nitrided P21 was attributed to the AlN precipitate-induced surface hardening.


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