scholarly journals Studies on the Wear Behaviour of High Chromium Alloy Steels

2021 ◽  
Vol 22 (2) ◽  
pp. 93-97
Author(s):  
Marius Valeriu Comici ◽  
◽  
Ioan Giacomelli ◽  
Maria Stoicanescu ◽  
◽  
...  
Keyword(s):  
Wear Behaviour ◽  
Chromium Alloy ◽  
High Chromium ◽  
Alloy Steels

Erosion-Corrosion Effects on Boiler Tube Metals in a Multisolids Fluidized-Bed Coal Combustor

1979 ◽  
Vol 101 (1) ◽  
pp. 1-7 ◽  
Author(s):  
H. H. Krause ◽  
D. A. Vaughan ◽  
R. W. Sexton ◽  
W. K. Boyd
Keyword(s):  
Heat Exchange ◽  
Fluidized Bed ◽  
Chromium Alloy ◽  
Boiler Tube ◽  
High Chromium ◽  
Bed Temperature ◽  
Erosion Corrosion ◽  
Alloy Steels ◽  
Fluidized Bed Process ◽  
Exchange Medium

Metal wastage of boiler tube materials has been measured during combustion of coal in a laboratory scale fast fluidized bed. In the multisolids fluidized-bed process, high-sulfur coal and limestone are fed to a conventional bed of selected high specific gravity materials. An entrained bed is superimposed on this dense bed, to act as the heat exchange medium. Erosion-corrosion effects were studied on simulated steam tubes (400–700°F, 204–370°C) oriented either horizontally or vertically in the bed. Results of 50-hr tests showed that the life of heat exchange tubes operating up to 650°F (343°C) in this type of combustor will depend primarily on erosion effects. Erosive wastage was greater in the dense bed than in the entrained bed, with greater losses on horizontal surfaces than on vertical surfaces. Support structures at bed temperature of 1600°F (870°C) were found to be subject to corrosion by oxidation and sulfidation reactions. High-chromium alloy steels proved to be most resistant to the erosive and corrosive effects.

scholarly journals Characteristics of Retained Austenite in Quenched High Carbon-High Chromium Alloy Steels

2009 ◽  
Vol 73 (11) ◽  
pp. 852-856
Author(s):  
Muneo Yaso ◽  
Shuhei Hayashi ◽  
Shigekazu Morito ◽  
Takuya Ohba ◽  
Kunichika Kubota ◽  
...  
Keyword(s):  
Retained Austenite ◽  
Chromium Alloy ◽  
High Carbon ◽  
High Chromium ◽  
Alloy Steels

NIROSTA 4465

Alloy Digest ◽  
2000 ◽  
Vol 49 (7) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Intergranular Corrosion ◽  
Phosphate Rock ◽  
Heat Treating ◽  
Chromium Alloy ◽  
Low Carbon ◽  
High Chromium ◽  
Temperature Performance

Abstract Nirosta 4465 is a low-carbon, high-chromium alloy with nickel and molybdenum. It has good corrosion and intergranular corrosion resistance. The alloy is used for processing phosphate rock. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fracture toughness. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SS-797. Producer or source: ThyssenKrupp Nirosta.

scholarly journals Review on the Current State of Developing of Advanced Creep Damage Constitutive Equations for High Chromium Alloy

2012 ◽  
Vol 510 ◽  
pp. 776-780 ◽  
Author(s):  
Li Li An ◽  
Qiang Xu ◽  
Dong Lai Xu ◽  
Zhong Yu Lu
Keyword(s):  
Constitutive Equations ◽  
Creep Damage ◽  
Chromium Alloy ◽  
High Chromium ◽  
Current State ◽  
Specific Material ◽  
Future Work

This paper presents a review of developing of creep damage constitutive equations for high chromium alloy (such as P91 alloy). Firstly, it briefly introduces the background of creep damage for P91 materials. Then, it summarizes the typical creep damage constitutive equations developed and applied for P91 alloy, and the main deficiencies of KRH (Kachanov-Robatnov-Hayhurst) type and Xus type constitutive equations. Finally it suggests the directions for future work. This paper contributes to the knowledge for the developing creep damage constitutive equations for the specific material.

Microstructural Characterization, Tribological and Corrosion Behaviour of Forged and Cast Grinding Balls a Comparative Study

2021 ◽  
Vol 406 ◽  
pp. 334-347
Author(s):  
Khedidja Bouhamla ◽  
Amel Gharbi ◽  
Oualid Ghelloudj ◽  
Ali Hadji ◽  
Maouche Hichem ◽  
...  
Keyword(s):  
Cast Iron ◽  
Comparative Study ◽  
Wear Behavior ◽  
Corrosion Behaviour ◽  
Wear Behaviour ◽  
High Chromium ◽  
Grinding Balls ◽  
Corrosion Tests ◽  
High Chromium Cast Iron ◽  
Chromium Cast Iron

Various facilities are used in mineral processing to prepare raw material. Practically, two types of balls are used, cast balls and forged balls. They are respectively made from high chromium cast iron and forged steel and are supplied in different sizes and chemical compositions. The cast and forged balls have different microstructures and consequently display dissimilar wear behavior. The target aimed in this work is to achieve a comparative study taking into account the type of microstructure, mechanical properties, and wear behavior of these two kinds of materials. Specimens have undergone chemical, metallographic and XRD characterizations. Subsequently, these samples were subjected to hardness measurements, abrasion and friction tests in order to evaluate their wear behaviour. Tribological tests, under unlubricated environment, are carried out on both types of grinding balls in order to study the wear system. Corrosion tests are also performed on forged steel and high chromium cast iron ball samples. The obtained results reveal a large difference in terms of chemical composition and microstructural components. Chromium cast iron balls are more resistant to friction, whereas forged balls are more resistant to abrasion. Additionally, the corrosion tests reveal a narrow discrepancy in corrosion behaviour between the studied materials.

Wear Resistance of Nano TiN Strengthen High Chromium Cast Iron

2012 ◽  
Vol 217-219 ◽  
pp. 2410-2413 ◽  
Author(s):  
Xing Hai Shao ◽  
Jing Pei Xie ◽  
Wen Yan Wang ◽  
Yan Li ◽  
Pin Gan Zhou ◽  
...  
Keyword(s):  
Grain Size ◽  
Wear Resistance ◽  
Cast Iron ◽  
Alloy Layer ◽  
Chromium Alloy ◽  
High Chromium ◽  
High Chromium Cast Iron ◽  
Carbon Ferrochrome ◽  
Micro Analysis ◽  
Chromium Cast Iron

The effects and the mechanisms of namo TiN on the high chromium cast iron are studied, the material has been prepared through infiltration casting and addition of high carbon ferrochrome powder and nano TiN powder. The alloy is formed on the surfaced of guide plate, and the wear resistance of alloy have been studied by means of SEM, XRD micro-analysis and wear-resistant performance. The grain size and the type of carbide in the organization are affected by nano TiN, and the wear resistance of carbon chromium alloy layer is affected by the type of carbide; when the addition of nano TiN is 1% (wt), the grain size is apparently refined, overeutectic primary M7C3 in the hypereutectic is precipitated uniformly in considerable amounts, therefore the wear resistance of alloy can be improved effectively.

Influence of Porosity and Alloy addition on the Wear behaviour of a Sinter-Forged C45 Steel using Taguchi Method

2020 ◽  
Author(s):  
NAVEEN EASWARAN ◽  
Shanmugam Ramasamy ◽  
Roshan Nagarajan ◽  
Ramanan Nandagopal ◽  
Sripada Ragavendra Keshava Narasimha
Keyword(s):  
Wear Resistance ◽  
Mass Loss ◽  
Wear Test ◽  
Theoretical Density ◽  
Wear Behaviour ◽  
Dry Sliding Wear ◽  
Input Parameters ◽  
Alloy Addition ◽  
Pin On Disc ◽  
Alloy Steels

Elemental powders of Atomized Iron (Fe), Carbon (C) and Molybdenum (Mo) were weighed and mixed in a pot mill to yield the composition of C45, C45-1%Mo and C45-2%Mo Steels, then compacted and sintered. The Sintered preforms had a density- 75% of the Theoretical Density. Then the Sintered preforms were subjected to densification to get two densities- 80% and 85% of the theoretical density through Forging. The sintered and densified preforms of alloy steels were subsequently machined to get the required wear test specimens.The experiments were conducted on a Pin-on-disc Tribometer, conforming to ASTM G99 standards, on a rotating EN32 disc. Using Minitab 16 software, the Dry Sliding wear experiments were planned using L27 Orthogonal Array.The % Theoretical Density of the Specimens (1-%Porosity), % Mo Addition, Load and Sliding Velocity were taken as input parameters, mass loss was the output parameter. It was observed that the increasing density of alloy steels adversely affects the wear resistance of the alloy steels and mass loss is increased. It was found that the addition of Mo significantly improves the wear resistance of the alloy steels irrespective of the densities .Empirical correlations for mass loss with respect to input parameters had been developed.

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