scholarly journals Differentiated welding deposit of soiling parts according to abrasive wear map

2021 ◽  
Vol 291 ◽  
pp. 02030
Author(s):  
Viktor Myalenko ◽  
Olga Sankina
Keyword(s):  
Heat Treatment ◽  
Cast Iron ◽  
Abrasive Wear ◽  
Friction Surface ◽  
Gray Cast Iron ◽  
Physical And Mechanical Properties ◽  
Hardened Layer ◽  
Wear Intensity ◽  
Gray Cast ◽  
Soil Cutting

The paper proposes the use of maps of the expected abrasive wear of the friction surface of a soil-cutting part, which characterize the wear intensity at various points of the friction surface during its movement in the soil environment. The importance of this work is caused by changes in modern technologies for the cultivation of agricultural crops, requiring changes in the geometric shapes of soil-cutting parts with the need to predict their service life. A study of the physical and mechanical properties and structure of the hardened layer was carried out using gray cast iron. Gray cast iron was preliminarily subjected to heat treatment, which made it possible to increase the tensile strength up to 200 … 250 MPa and hardness up to HRC 50 … 55. To increase the wear resistance of soil-cutting parts operating in an abrasive environment, hardening was carried out by the electric spark method using gray cast iron, previously subjected to heat treatment. The microstructure of the deposited layer became pearlite-ledeburite without graphite precipitation. Electro-spark deposition made it possible to form a wear-resistant layer in several passes, while the structure of the cast iron and the base did not undergo any changes. No increase in grain size was observed in the deposited layer, which favorably affects its properties. The hardness of the deposited layer was higher (4800 … 5000 MPa) than that of the base metal (2300 … 2400 MPa), no softening of the base was observed. According to the test results of hardened products, heat-treated gray cast iron can be recommended for use as a material for hardening, since the thickness of the coating does not lead to changes in the initial geometric dimensions of the soil-cutting tool using differentiated surfacing using abrasive wear maps.

scholarly journals An investigation of abrasive wear and corrosion behavior of surface repair of gray cast iron by SMAW

2017 ◽  
Vol 6 (1) ◽  
pp. 90-95 ◽  
Author(s):  
Alireza Sadeghi ◽  
Ahmad Moloodi ◽  
Masoud Golestanipour ◽  
Meysam Mahdavi Shahri
Keyword(s):  
Cast Iron ◽  
Abrasive Wear ◽  
Corrosion Behavior ◽  
Gray Cast Iron ◽  
Gray Cast ◽  
Wear And Corrosion ◽  
Surface Repair

scholarly journals Increasing wear resistance of the protective sleeve of the centrifugal pump made of gray cast iron by surface hardening

2021 ◽  
pp. 103
Author(s):  
Nataliia Lalazarova ◽  
Оlga Afanasieva ◽  
Olena Popova ◽  
Oleksiy Dmytrenko
Keyword(s):  
Wear Resistance ◽  
Cast Iron ◽  
High Frequency ◽  
Gray Cast Iron ◽  
Operating Time ◽  
Hardened Layer ◽  
Gray Cast ◽  
Centrifugal Pumps ◽  
Surface Quenching ◽  
Surface Induction

One of the weak spots that reduce the guaranteed operating time of centrifugal pumps is the assembly that includes the seal and protective sleeves. The main purpose of the bushings in the rotor kit is to protect the shaft from corrosion, erosion and wear. The sleeve operates under abrasive wear conditions by packing elements and abrasive particles that get into the liquid pumped by the pump. The protective sleeves made of gray cast iron do not meet the service life in connection with accelerated surface wear. Goal. The purpose of the work is to ensure high wear resistance of cast iron pump parts by heat treatment. Method. The chemical composition was determined on a portable laser analyzer Laser Z200 C +. The structure was studied using an optical microscope. The wear was investigated by the roller-block method on a friction machine. Surface quenching was carried out with a high-frequency lamp generator in a single-turn inductor. Results. The microstructure of gray cast iron as cast consists of pearlite, ferite, double phosphide eutectic and inclusions of lamellar graphite. Microhardness of small-lamellar pearlite is Н50 = 1550–2220 MPa, microhardness of phosphide eutectic is Н50 = 6500–8000 MPa. Surface induction quenching by high-frequency currents followed by low tempering is an effective way to increase the wear resistance of cast iron products of small cross-section and does not cause warping. Cast iron for surface quenching should have a pearlite structure, and graphite should be contained in the form of small inclusions. The optimal heating temperature for induction hardening was determined as 900 °С, which made it possible to obtain the microstructure of the hardened layer – martensite, double phosphide eutectic and graphite. Scientific novelty. The developed modes of surface quenching make it possible to preserve a double phosphide eutectic in the structure of the surface layer, which makes it possible to obtain high hardness and wear resistance of the hardened layer. Practical significance. Surface induction quenching with low tempering of cast gray iron increased its wear resistance by 2,4 times. The previous normalization had practically no effect on the durability of cast iron, since its structure contains less than 10% ferrite.

Enhancement of the Gray Cast Iron Properties by Adding Chromium Element

2017 ◽  
Vol 753 ◽  
pp. 218-221
Author(s):  
Awad Eisa Gaib Alla Mohamed ◽  
Khairi Abdulsalam
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Cast Iron ◽  
Gray Cast Iron ◽  
Chromium Content ◽  
Gray Cast ◽  
Three Samples ◽  
Before And After ◽  
Different Temperatures

In this paper the effect of chromium element on some mechanical properties of gray cast iron is studied .The work was divided in to four categories, each category has three samples; each sample has three different chromium content 0.0%, 1.7%, 3.7%. The mechanical properties were investigated (hardness and impact) before and after the heat treatment. The heat treatment was carried out for period of 12 minutes at two different temperatures. The results confirmed that durability, toughness, and hardness are proportional to the chromium content. The ultimate aim of this research is to enhance the mechanical properties of gray cast iron by adding chromium element.

scholarly journals Revealing the technological modes range for ultrasonic surface hardening of cast iron

2018 ◽  
Vol 224 ◽  
pp. 03001
Author(s):  
Yulia Semenova ◽  
Yuri Nikitin ◽  
Andrey Rakhimyanov
Keyword(s):  
Mathematical Modeling ◽  
Cast Iron ◽  
Surface Hardening ◽  
Gray Cast Iron ◽  
Hardened Layer ◽  
Maximum Intensity ◽  
Gray Cast ◽  
Processing Conditions

Prospects of using the ultrasonic surface hardening of different materials as a way of achieving a simultaneous strengthening and finishing effects are presented. It is shown that this method is applicable for non-rigid and brittle parts. Thus, it allows processing gray cast iron. Therefore, the paper is devoted to establishing technologically significant parameters of ultrasonic surface hardening of particular gray cast iron. Research was conducted using mathematical modeling of the process. According to the calculations, the application of the modes revealed makes it possible to achieve the depth of the hardened layer up to 2 mm. Moreover, the parameters of the hardened layer, such as the diameter of a single imprint and the maximum intensity of deformation for specified processing conditions are calculated.

The friction surface of gray cast iron brake rotors

Wear ◽  
1973 ◽  
Vol 23 (2) ◽  
pp. 271-273 ◽  
Author(s):  
S.K. Rhee ◽  
R.T. DuCharme
Keyword(s):  
Cast Iron ◽  
Friction Surface ◽  
Gray Cast Iron ◽  
Gray Cast ◽  
Brake Rotors

scholarly journals Processing and Effect of Heat treatment on Mechanical Properties of Gray Cast Iron

2016 ◽  
Vol V5 (09) ◽  
Author(s):  
K. Teja ◽  
N. Prashanth ◽  
M. V. R. Phanindran ◽  
Dr. K. Chandra Shekar ◽  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Cast Iron ◽  
Gray Cast Iron ◽  
Gray Cast

Usability of Boron as an Alloying Element in Gray Cast Iron Rollers and its Effect to Abrasive Wear Behaviour

2012 ◽  
Vol 445 ◽  
pp. 331-336
Author(s):  
Cemal Meran ◽  
Mehmet Yuksel
Keyword(s):  
Cast Iron ◽  
Wear Rate ◽  
Abrasive Wear ◽  
Gray Cast Iron ◽  
Operating Conditions ◽  
Gray Cast ◽  
Wear Behaviour ◽  
Sliding Speed ◽  
Abrasive Wear Behaviour ◽  
Wear Tests

In this study, usability of boron as an alloy element in gray cast iron and its effect to abrasive wear behaviour were investigated. Pin-on-drum wear tests at the room temperature carried out for seven low nickels alloyed gray cast irons with different boron addition. The mass losses, hardness values and microstructures for gray cast iron specimens with different boron alloyed were investigated for determining wear behaviour. The pin for the wear tests was manufactured from X210Cr12 cold work tool steel with material number of 1.2080. Abrasive pin-on-drum wear tests were carried out at a 165 N constant load and two different sliding speeds that are closely related to the appropriate operating conditions in rolling mills. The experimental studies have shown that wear rate decrease with increasing boron amount in chemical composition of the alloy and the wear rate at high sliding speed has decreased more rapidly than the rate at the low sliding speed with increasing boron amount.

scholarly journals Comparison of Wear Performance of Austempered and Quench-Tempered Gray Cast Irons Enhanced by Laser Hardening Treatment

2020 ◽  
Vol 10 (9) ◽  
pp. 3049
Author(s):  
Bingxu Wang ◽  
Gary C. Barber ◽  
Rui Wang ◽  
Yuming Pan
Keyword(s):  
Heat Treatment ◽  
Cast Iron ◽  
Surface Hardening ◽  
Gray Cast Iron ◽  
High Hardness ◽  
Laser Surface ◽  
Gray Cast ◽  
Wear Loss ◽  
Laser Surface Hardening ◽  
Hardening Treatment

The current research studied the effects of laser surface hardening treatment on the phase transformation and wear properties of gray cast irons heat treated by austempering or quench-tempering, respectively. Three austempering temperatures of 232 °C, 288 °C, and 343 °C with a constant holding duration of 120 min and three tempering temperatures of 316 °C, 399 °C, and 482 °C with a constant holding duration of 60 min were utilized to prepare austempered and quench-tempered gray cast iron specimens with equivalent macro-hardness values. A ball-on-flat reciprocating wear test configuration was used to investigate the wear resistance of austempered and quench-tempered gray cast iron specimens before and after applying laser surface-hardening treatment. The phase transformation, hardness, mass loss, and worn surfaces were evaluated. There were four zones in the matrix of the laser-hardened austempered gray cast iron. Zone 1 contained ledeburite without the presence of graphite flakes. Zone 2 contained martensite and had a high hardness, which was greater than 67 HRC. Zone 4 was the substrate containing the acicular ferrite and carbon-saturated austenite with a hardness of 41–27 HRC. In Zone 3, the substrate was tempered by the low thermal radiation. For the laser-hardened quench-tempered gray cast iron specimens, three zones were observed beneath the laser-hardened surface. Zone 1 also contained ledeburite, and Zone 2 was full martensite. Zone 3 was the substrate containing the tempered martensite. The tempered martensite became coarse with increasing tempering temperature due to the decomposition of the as-quenched martensite and precipitation of cementite particles. In the wear tests, the gray cast iron specimens without heat treatment had the highest wear loss. The wear performance was improved by applying quench-tempering heat treatment and further enhanced by applying austempering heat treatment. Austempered gray cast iron specimens had lower mass loss than the quench-tempered gray cast iron specimens, which was attributed to the high fracture toughness of acicular ferrite and stable austenite. After utilizing the laser surface hardening treatment, both austempered and quench-tempered gray cast iron specimens had decreased wear loss due to the high surface protection provided by the ledeburitic and martensitic structures with high hardness. In the worn surfaces, it was found that cracks were the dominant wear mechanism. The results of this work have significant value in the future applications of gray cast iron engineering components and provide valuable references for future studies on laser-hardened gray cast iron.

Heat treatment and diamond burnishing of gray cast iron

1982 ◽  
Vol 24 (11) ◽  
pp. 805-807
Author(s):  
L. A. Khvorostukhin ◽  
N. A. Bystrova ◽  
L. I. Belykh
Keyword(s):  
Heat Treatment ◽  
Cast Iron ◽  
Gray Cast Iron ◽  
Gray Cast ◽  
Diamond Burnishing
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