scholarly journals Investigations of Microstructures and Erosion–Corrosion Performance of Cast Boron-Bearing Stainless Steel

Coatings ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1553
Author(s):  
Dawei Yi ◽  
Bin Li ◽  
Xiao Tan ◽  
Sifan Liu ◽  
Jin Chen ◽  
...  
Keyword(s):  
Weight Loss ◽  
Stainless Steel ◽  
Cast Iron ◽  
White Cast Iron ◽  
Cast Steel ◽  
Corrosion Properties ◽  
X Ray ◽  
Rotating Speed ◽  
Heat Treated ◽  
Erosion Corrosion

The microstructures and erosion–corrosion properties of boron-bearing stainless steel were researched by an erosion–corrosion tester, energy dispersive X–ray spectrometry, scanning electron microscope and X-ray diffraction analysis. The microstructures of as-cast, boron-bearing stainless steel contain M7(B,C)3, M2(B,C) borocarbides and the martensite matrix; the matrix has less chromium and more nickel than those in the M2(B,C) and M7(B,C)3. The microstructures in heat-treated, boron-bearing stainless steel consist of M7(B,C)3, M2(B,C) and M23(B,C)6 borocarbides and ferrite, and the Rockwell hardness of heat-treated, boron-bearing stainless steel is lower than that of as-cast steel. For Cr28 white cast iron and boron-bearing stainless steel, the mixing wheel with higher rotating speed leads to a higher erosion–corrosion weight loss, and as the impingement angle increases, the erosion–corrosion weight loss increases first, and then decreases. For any erosion–corrosion experiment conditions, the erosion–corrosion resistance of boron-bearing stainless steel is better than that of Cr28 white cast iron.

Modeling Corrosion Property of High Chromium Cast Iron under H3PO4 Medium Condition Using Artificial Intelligence

2010 ◽  
Vol 150-151 ◽  
pp. 1054-1057
Author(s):  
Song Min Zhang ◽  
Liu Jie Xu
Keyword(s):  
Neural Network ◽  
Weight Loss ◽  
Cast Iron ◽  
Bp Neural Network ◽  
Corrosion Property ◽  
Corrosion Properties ◽  
High Chromium ◽  
High Chromium Cast Iron ◽  
Chromium Cast Iron ◽  
Corrosion Time

The components in slurry pump suffer serious corrosion and abrasion in the phosphorus fertilizer manufacturing process because they undergo corrosion of H3PO4 medium and impact of particles at the same time. Presently, High chromium cast irons are often used to produce the components in slurry pump. In order to reveal the corrosive law, the corrosion properties of high chromium cast iron with 26wt.%Cr content (Cr26) were tested under different H3PO4 medium concentration conditions. Using back-propagation (BP) neural network, the non-linear relationship between the corrosion weight losses (W) and H3PO4 concentration, corrosion time (C, t) is established on the base of the dealing with experimental data. The results show that the well-trained BP neural network can predict the wear weight loss precisely according to H3PO4 concentration and corrosion time. The prediction results reveal that corrosion weight loss rises linearly with increasing corrosion time. The H3PO4 concentration has obvious effect on corrosion property. When H3PO4 concentration is lower than about 0.5mol/L, high chromium cast iron has well resistance to H3PO4 corrosion. However, the corrosion resistance of high chromium cast iron rapidly decreases when the H3PO4 concentration exceed about 0.8 mol/L. It is suggest the high chromium cast iron be used under the condition of H3PO4 concentration of lower 0.8 mol/L.

Spectrographic Analysis of Cast Iron Using Fused Buttons

1971 ◽  
Vol 25 (3) ◽  
pp. 342-344 ◽  
Author(s):  
John P. Cummings ◽  
Ronald H. Hall ◽  
Ronald J. Plenzler
Keyword(s):  
Weight Loss ◽  
Cast Iron ◽  
High Voltage ◽  
Analytical Method ◽  
White Cast Iron ◽  
Inert Atmosphere ◽  
Spectrographic Analysis ◽  
Analytical Results ◽  
Good Homogeneity

This paper presents an analytical method for the determination of minor metals in white cast iron fused buttons. This method enables the measurement of metals in cast iron with rapidity and excellent analytical results. Buttons of 40 g appear to be ideal but smaller button samples can be tolerated. The fused buttons have good homogeneity, very slight weight loss, and no significant change in composition. Metal cast spectrochemical samples are analyzed in an inert atmosphere utilizing a high voltage spark.

Slurry Erosion Response of Heat Treated 13Cr-4Ni Martensitic Stainless Steel

2012 ◽  
Vol 710 ◽  
pp. 500-505 ◽  
Author(s):  
Hassan Jayaraj Amarendra ◽  
Pradeep Kalhan ◽  
Gajanan Prabhakar Chaudhari ◽  
Sameer Kumar Nath ◽  
Shravan Kumar
Keyword(s):  
Stainless Steel ◽  
Erosion Resistance ◽  
Martensitic Stainless Steel ◽  
Cast Steel ◽  
Heat Treatments ◽  
Wear Loss ◽  
Slurry Erosion ◽  
Heat Treated ◽  
Work Effect ◽  
Wear Characterization

In the present work, effect of various heat treatments on slurry erosion behavior of 13Cr-4Ni martensitic stainless steel (MSS) at different impingement angles has been studied. The as-received cast bars of MSS were given various heat treatments. These heat treatments involved the austenitization of cast steel at temperatures of 950° C, 1000° C and 1050° C for different soaking durations of 2, 4 and 6 h at each temperature. This was followed by oil quenching then tempering for 1 h at a 600° C air cooled. Heat treated MSS samples were characterized for microstructure and mechanical properties viz. hardness, ductility (% elongation), tensile strength (UTS), and toughness. For wear characterization, slurry erosion tests were conducted at different impingement angles for as-received cast and heat treated samples. The heat treated MSS shows approximately 34% lesser weight loss as compared to as-received cast MSS. Increase in toughness of heat treated samples is found to be responsible for the improved slurry erosion resistance. Impingement angle close to 0° showed least wear loss.

Interfacial Characteristics and Wear Resistance of WCp/White-Cast-Iron Composites

2007 ◽  
Vol 26-28 ◽  
pp. 293-296 ◽  
Author(s):  
Guo Shang Zhang ◽  
Yi Min Gao ◽  
Jian Dong Xing ◽  
Shi Zhong Wei ◽  
Xi Liang Zhang
Keyword(s):  
Wear Resistance ◽  
Cast Iron ◽  
White Cast Iron ◽  
Centrifugal Casting ◽  
Casting Process ◽  
Iron Matrix ◽  
High Chromium ◽  
X Ray ◽  
High Chromium Cast Iron ◽  
Wear Tests

To improve the wear resistance of high chromium white cast iron under severe abrasive conditions, a composites layer was designed for wear surface, which were locally reinforced with WC particles. And the local composites were successfully fabricated by optimized centrifugal casting process. Then the interface between WC and iron matrix was analyzed with scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD). And three body wear tests were carried out on a self-made rig to investigate the wear resistance of the composites. For comparison, the wear tests of high chromium white cast iron were also carried out under the same conditions. The results show that: There are no defects such as inclusion, crack, gas pore and so on in the obtained composites layer, which with a uniform thickness of 10 mm. WC particles are homogeneously distributed in the composites layer and tightly bonded with the iron matrix. The WC particles are partially dissolved in the iron matrix during centrifugal casting. The elements W, C and Fe react to form new carbides such as Fe3W3C or M23C6, which precipitate around former WC particles during subsequent solidification. So the interface between WC particles and the iron matrix is a strong metallurgical bonding. WC particles in the composites layer can effectively resist cutting by the abrasive, and then protect the matrix. The wear resistance of the composites layer is 7.23 times of that of high chromium cast iron.

Erosion–corrosion and corrosion properties of DLC coated low temperature gas-nitrided austenitic stainless steel

Wear ◽  
2009 ◽  
Vol 267 (9-10) ◽  
pp. 1709-1714 ◽  
Author(s):  
Morten S. Jellesen ◽  
Thomas L. Christiansen ◽  
Lisbeth Rischel Hilbert ◽  
Per Møller
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Low Temperature ◽  
Corrosion Properties ◽  
Erosion Corrosion

scholarly journals Effect of solid-solution and aging treatment on corrosion behavior of orthogonal designed and vacuum melted Mg-Zn-Ca-Mn alloys

2020 ◽  
Vol 18 ◽  
pp. 228080001988790 ◽  
Author(s):  
Dexue Liu ◽  
Tianshui Zhou ◽  
Zehua Liu ◽  
Bing Guo
Keyword(s):  
Solid Solution ◽  
Corrosion Resistance ◽  
Degradation Rate ◽  
Cast Alloy ◽  
Vacuum Induction Melting ◽  
Corrosion Properties ◽  
X Ray ◽  
Orthogonal Method ◽  
Heat Treated

Fast degradation rate and inhomogeneous corrosion are obstacles for magnesium alloy bio-corrosion properties. In this paper, a quaternary Mg-Zn-Ca-Mn alloy was designed by an orthogonal method and prepared by vacuum induction melting to investigate its bio-corrosion. Microstructure, corrosion morphology, and bio-corrosion properties of as-cast alloys 1 to 5 with good corrosion resistance were characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction with immersion and electrochemical tests in simulated body fluid (SBF), respectively. Both the orthogonal method and in vitro degradation experiments demonstrated that alloy 3 exhibited the lowest degradation rate among the tested quaternary Mg-Zn-Ca-Mn alloys. Then, as-cast alloy 3 was treated by solid-solution and solid-solution aging. In vitro experimental results indicated that as-cast alloy 3 showed better corrosion resistance than heat-treated specimens and the average corrosion rate was approximately 0.15 mm/y. Heat-treated alloy 3 exhibited more uniform corrosion than as-cast alloy specimens. These results suggest that alloy 3 has the potential to become a biodegradable candidate material.

scholarly journals Cr Segregation and Impact Fracture in a Martensitic Stainless Steel

Coatings ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 843 ◽  
Author(s):  
Eleonora Bolli ◽  
Alessandra Fava ◽  
Paolo Ferro ◽  
Saulius Kaciulis ◽  
Alessio Mezzi ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Photoelectron Spectroscopy ◽  
Martensitic Stainless Steel ◽  
Steel Matrix ◽  
X Ray ◽  
Fracture Surfaces ◽  
Heat Treated ◽  
Brittle Fractures ◽  
Cr Concentration ◽  
Inner Parts

The fracture surfaces of a 10.5 wt.% Cr martensitic stainless steel broken in Charpy tests have been investigated through X-ray photoelectron spectroscopy (XPS). The specimens have been examined in two different conditions: as-quenched and heat treated for 10 h at 700 °C. The trends of Fe/Cr ratio vs. test temperature are similar to the sigmoidal curves of absorbed energy and, after both ductile and quasi-cleavage brittle fractures, such ratio is always significantly lower than the nominal value of the steel chemical composition. Cr segregation does not occur on a macroscopic scale but takes place in microscopic zones which represent weaker spots in the steel matrix and a preferred path for moving cracks. Small area (diameter 300 µm) XPS measurements evidenced a higher density of such microscopic zones in the inner part of probes; this is explained by the different diffusion length of Cr atoms in the external and inner parts during quenching from austenitic field which has been calculated through FEM simulations. No significant differences of Cr concentration were observed in fracture surfaces of probes with and without heat treatment. The results highlight how Cr segregation plays a role not only in the intergranular mode of fracture but also in the quasi-cleavage and ductile ones.

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