scholarly journals Solidification forming and numerical simulation of 90° wear-resistant bend with high-vanadium cast iron

2020 ◽  
Vol 1605 ◽  
pp. 012118
Author(s):  
P H Chen ◽  
Y Zhang ◽  
R Q Li
2016 ◽  
Vol 6 (1) ◽  
pp. 11
Author(s):  
Kus Hanaldi

Salah satu material yang dapat digunakan pada kondisi lingkungan abrasif adalah white cast irons atau abrasion-resistant cast iron. EN-JN2019 adalah salah satu jenis besi cor yang dapat digunakan pada kondisi ini. Pada besi cor  ini terkandung unsur karbon, silikon, mangan, dan chromium. Analisa ketahanan aus material ini telah dilakukan dengan menggunakan factorial design terhadap dua kombinasi kandungan chromium (1% dan 2%), dua kombinasi kandungan silikon (1% dan 1,5%) dan dua kombinasi ketebalan sampel (5mm dan 30mm). Ketebalan sampel merupakan representasi dari laju pendinginan. Kajian terhadap kekerasan, struktur mikro, uji impact dan uji aus dari delapan sampel yang dihasilkan dari proses pengecoran telah dilaksanakan pula. Hasil pengujian kekerasan menunjukkan bahwa kekerasan menurun dengan meningkatnya ketebalan dan disertai dengan perubahan struktur mikro sebagai hasil dari laju pendinginan yang semakin lambat. Penambahan kandungan chromium meningkatkan kekerasan karena adanya pembentukan karbida. Penambahan kandungan silikon menurunkan kekerasan akibat pembentukan grafit yang lebih mudah. Pengaruh kandungan chromium dan silikon terhadap kekerasan memiliki ketergantungan  satu  dengan  lainnya,  karena  penambahan  silikon  menekan  pertumbuhan  karbida.  Dari  hasil pengujian impact didapatkan hasil, pada semua variasi chromium, silikon dan ketebalan tidak memiliki pengaruh terhadap harga impact. Sedangkan dari hasil pengujian keausan  didapatkan bahwa kekerasan  berbanding lurus dengan nilai wear resistant, semakin tinggi kekerasan maka nilai wear resistant akan semakin meningkat.Kata kunci: ketahanan aus, EN-JN2019, kandungan chromium, kandungan silikon, laju pendinginan, factorial design, pembentukan karbida.


2012 ◽  
Vol 2 (1) ◽  
Author(s):  
Krzysztof Wołosz ◽  
Jacek Wernik

AbstractThe paper presents the part of the investigation that has been carried out in order to develop the pneumatic pulsator which is to be employed as an unblocking device at lose material silo outlets. The part of numerical simulation is reported. The fluid dynamics issues have been outlined which are present during supersonic airflow thought the head of the pulsator. These issues describe the pneumatic impact phenomenon onto the loose material bed present in the silo to which walls the pulsator is assembled. The investigation presented in the paper are industrial applicable and the result is the working prototype of the industrial pneumatic pulsator. The numerical simulation has led to change the piston shape which is moving inside the head of the pulsator, and therefore, to reduce the pressure losses during the airflow. A stress analysis of the pulsator controller body has been carried out while the numerical simulation investigation part of the whole project. The analysis has made possible the change of the controller body material from cast iron to aluminium alloy.


Author(s):  
N.N. Aleksandrov ◽  
N.S. Gushchin ◽  
N.F. Nuraliev

New high-tech spheroidal graphite chromium-nickel cast iron with improved as-cast properties is developed. The technological advantages of the new alloy are shown in comparison with foreign cast iron of the type Nihard-4. High-quality castings of grinding elements made of new domestic wear -resistant cast iron are made in the conditions of Russian plants using the developed technology. Medium-speed coal grinding mills equipped with these grinding elements have successfully passed the operational test at domestic and foreign thermal power plants. The technical and economic advantages of the new technology in comparison with foreign ones are shown, which made it possible to guarantee the stable production of high-quality wear-resistant massive castings of complex c onfi guration using domestic materials under the conditions of Russian plan.


2017 ◽  
Vol 17 (1) ◽  
pp. 37-40 ◽  
Author(s):  
M. Dojka ◽  
R. Dojka ◽  
A. Studnicki

Abstract The aim of presented studies was to develop a new geometry of the overflow part of standard ATD-C tester for derivative thermal analysis in a way that it would allow to obtain samples for abrasion and mechanical properties tests in the same mould without the need of cutting them from a block of material. The pattern of new ATD-P tester has parts reflecting implemented samples. Computer simulations regarding initial verification of new tester were performed in NovaFlow software. Chromium cast iron melts were made for testing the sampler in real conditions and TDA analysis for casting material were conducted. The sandmix was prepared on silica sand matrix per the ALPHASET technology. This new solution greatly simplifies the preparations of materials difficult to machine.


2010 ◽  
Vol 22 (8) ◽  
pp. 1755-1760 ◽  
Author(s):  
郭怡晖 Guo Yihui ◽  
刘继常 Liu Jichang ◽  
卢远志 Lu Yuanzhi ◽  
刘金水 Liu Jinshui ◽  
颜丙功 Yan Binggong

2015 ◽  
Vol 761 ◽  
pp. 298-302
Author(s):  
N.I.S. Hussein ◽  
S.R. Kamarul ◽  
Mohamad Nizam Ayof

The wear on the cutting edge of the gray cast iron trim cutter die will result in the burr formation on the trimmed blanks. This will increase the rejection rate, and hence, decreasing the efficiency of the production. By applying a wear resistant material, the wear rate on the cutting edge of the die is believed to be minimized. In this paper, the methodology of the experiment on the cladding process using gas metal arc as the heat source, and NiCrBSi-WC as the filler material on gray cast iron substrate is presented. NiCrBSi-WC is chosen as the filler material because of its outstanding wear resistance characteristic. Furthermore, it is a popular choice as a wear resistant material in various types of industry. The purpose of the planned experiment is to maximize the wear resistance of the trim cutting die. It is also a fraction of the case study based on the parts production in the automotive industry in Malaysia.


1996 ◽  
Vol 17 (6) ◽  
pp. 607-622 ◽  
Author(s):  
D. M. Gureev ◽  
Yu. M. Matveev ◽  
S. I. Mednikov ◽  
V. K. Shukhostanov ◽  
S. V. Yamshchikov ◽  
...  

Sign in / Sign up

Export Citation Format

Share Document