Research on wear characteristics of AISI 1035 steel boronized at various parameters

Abstract

Purpose -This paper aims to research the tribological features of AISI 1035 steel, boronized at various parameters. Design/methodology/approach -The samples were boronized via box boronizing method. By using Ekabor 2 powders, boronizing was conducted at 840, 880, 920, 960 and 1,0008C for two, four and six hours. Wear resistance of boronized samples at determined parameters were analysed. Wear experiments were conducted under 40 N constant load at pin-on-disk experiment setup. Also, microstructures and microhardness values of boronized samples were analysed to determine the most suitable boronizing parameters against wearing. Findings -As a result of this study, the following findings are reported: it was determined as the temperature increased, the thicker the boride layer obtained during the boronizing. In the case of longer boronizing time, the distinct columnar structure was clearer. Whenever applying higher temperature and longer boronizing time, wear decreased and hardness values increased. It was also determined that when boronizing was conducted at 900 and 1,0008C for at least four to six hours, better results were obtained. Furthermore, the increment in the boronizing temperature and longer duration caused an increase in hardness from the surface to inwards and thus a decrease in wear ratio. Research limitations/implications -In the present study, only 40 N is used for a wear load and that is the limitation of the research. Practical implications -Boronizing of the parts using 900 and 1,0008C temperature and four to six hours time, the better results can be obtained. Wear resistance can be improved in the determined temperature interval for boronizing process. Therefore, the industrial firms can be gained huge economical profits. Originality/value -The outcome of the study will be beneficial for the academicians and industrial firms working on wear process. The service life of the steel parts can be extended via boronizing of steels working on quarries.

Basics of Formation of Iron Borid e Coatings

“…One (either FeB or Fe 2 B) or two (both FeB and Fe 2 B) boride phases may therefore be expected to form in a coating on the surface of any solid iron, alloy or steel substrate in the course of its thermochemical boriding, depending on temperature-time conditions and a source of boron employed. It is indeed observed experimentally (see, for example, [1][2][3][4][5][6][7][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]).…”

“…Comparison of angles 2θ and spacing d of experimental X-ray patterns obtained with the literature data for iron and chromium borides [50][51][52][53][54][55] indicated that in the case of 5-15% Cr alloys and a 13% Cr steel the outer boride layer bordering the boriding agent is a solid solution based on the FeB chemical compound, Table 1 for a Fe-5% Cr alloy as an example [48,49]. It is the first type of their microstructure, which is usually observed with steels [1][2][3][4][5][6][7][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]. Chromium content of the layers is rather significant.…”

Microstructural and tribological characterization of niobium boride coating produced on AISI 1020 steel via multicomponent boriding

“…EDS mapping analysis for the abrasive wear condition for the lower wear coefficient (0.98 N and 0.5 g cm −3 ) at the end of the test confirm that the niobium boride layer is completely smeared-off (as shown in figure 9). It can be seen an increase in the presence of oxygen atoms inside the wear crater region, despite the good oxidation resistance of the iron boride phases [49,50]. There is less amount of oxygen in the sample surface, which indicates that the niobium boride layers can be used as oxidation protection coatings [51].…”

Slurry erosion performance study of HVFS sprayed Ni-20Al2O3 and Ni-15Al2O3-5TiO2 coatings under hydro accelerated conditions

“…Gupta et al (1995) proposed the following correlation for the prediction of erosion rate: where E W is designated for erosion rate, “V” velocity, “d” particle size, “C” is slurry concentration, whereas K, α , β and γ are designated for various constants whose magnitudes depend on the target material and erodent properties. Furthermore, considerable research studies have been conducted in the past to understand the mechanism of wear of uncoated and coated members (Dogan et al 2003 and Kiratli and Findik, 2011).…”