scholarly journals Effect of Cold Ring Rolling on the Wear Resistance of GCr15 Bearing Steel after Quenching and Tempering

Metals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 647
Author(s):  
Bohan Lu ◽  
Wenting Wei ◽  
Huajie Mao ◽  
Xiaohui Lu
Keyword(s):  
Retained Austenite ◽  
Wear Behavior ◽  
Bearing Steel ◽  
Ring Rolling ◽  
Wear Loss ◽  
Austenite Content ◽  
Gcr15 Bearing Steel ◽  
Cold Ring Rolling ◽  
Quenching And Tempering ◽  
Carbide Content

In this work, the effects on dry wear behavior of cold ring rolling (CRR) of GCr15 bearing steel, after quenching and tempering (QT) heat treatment are investigated. The effects on steel microstructures and wear mechanisms of CRR with different austenitizing times are also discussed. The results show that, with a short austenitizing time of 10 min, CRR can increase the retained austenite content, decrease the undissolved carbide content and improve the hardness of the specimen, thus reducing ploughing and fatigue flaking, and decreasing the wear loss of the CRR specimen. With the longer austenitizing time of 20 min, the retained austenite content increases, the undissolved carbide content decreases, and the hardness increases significantly, both in specimens with and without CRR, so that ploughing, fatigue flaking, and wear loss can all be decreased. However, with an austenitizing time of less than 20 min, the effects of CRR on retained austenite content, undissolved carbide content, and hardness are not significant. Thus, CRR of less than 20 min cannot further improve wear morphology or decrease wear loss.

scholarly journals Wear Resistance of High C High Si Steel with Low Retained Austenite Content and Kinetically Activated Bainite

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 672 ◽  
Author(s):  
Bojan Podgornik ◽  
Mihael Brunčko ◽  
Peter Kirbiš
Keyword(s):  
Wear Resistance ◽  
Retained Austenite ◽  
Adhesive Wear ◽  
Cold Work ◽  
High Hardness ◽  
Bearing Steel ◽  
Austenite Content ◽  
Surrounding Matrix ◽  
Aisi D2 ◽  
Wear Mode

A novel high C high Si carbide free bainitic steel was developed for the production of cold work tools, knives, and rolls, requiring high hardness, toughness, as well as abrasive/adhesive wear resistance and resistance to galling at low costs. The steel was tribologically tested in dry sliding conditions under abrasive and adhesive wear mode, facilitated by using alumina and bearing steel ball as a counter-material, respectively. It was determined that carbide dissolution occurs under high contact pressures, thereby enriching the surrounding matrix with carbon and locally increasing the retained austenite content. The high retained austenite at the sliding interface increases the steels work hardening capacity and promotes superior wear resistance when compared to much more alloyed cold work tool steel, such as AISI D2. The steel has a high resistance to galling as determined by sliding against a soft steel bar due to its chemical composition.

scholarly journals Tribological Response of Heat Treated AISI 52100 Steels Against Steel and Ceramic Counterparts

2017 ◽  
Vol 17 (3) ◽  
pp. 222-228 ◽  
Author(s):  
E. Türedi ◽  
M. Yilmaz ◽  
V. Senol
Keyword(s):  
Surface Characterization ◽  
Wear Behavior ◽  
Wear Test ◽  
High Hardness ◽  
Bearing Steel ◽  
Wear Loss ◽  
Bearing Steels ◽  
Treatment Conditions ◽  
Heat Treated ◽  
Aisi 52100

Abstract AISI 52100 bearing steels are commonly used in applications requiring high hardness and abrasion resistance. The bearing steels are working under dynamic loads in service conditions and their toughness properties become important. In order to provide the desired mechanical properties, various heat treatments (austenizing, quenching and tempering) are usually applied. In this study, AISI 52100 bearing steel samples were austenized at 900°C for ½ h and water quenched to room temperature. Then tempering was carried out at 795°C, 400°C and 200°C for ½ h. In order to investigate the effect of heat treatment conditions on wear behavior, dry friction tests were performed according to ASTM G99-05 Standard with a ‘ball-on-disk’ type tribometer. The samples were tested against steel and ceramic counterparts using the parameters of 100 m distance and 30 N load and 0.063 m/s rotational speed. After wear test, the surface characterization was carried out using microscopy. Wear loss values were calculated using a novel optical method on both flat and counterpart specimens.

Sliding Friction and Wear Behavior of GCr15 Bearing Steel at Different Temperatures

2021 ◽  
Vol 324 ◽  
pp. 35-42
Author(s):  
Dong Yue Wang ◽  
Rong Chang Xu ◽  
Dian Xiu Xia ◽  
Shou Ren Wang ◽  
Ying Chao Pei ◽  
...  
Keyword(s):  
Friction And Wear ◽  
Room Temperature ◽  
Sliding Friction ◽  
Wear Behavior ◽  
Testing Machine ◽  
Bearing Steel ◽  
Wear Testing ◽  
Fatigue Wear ◽  
Gcr15 Bearing Steel ◽  
Electron Image

The effects of temperature on the friction and wear properties of GCr15 were studied by using a RETC multifunctional friction and wear testing machine. The microstructure characterization of the worn surface of the experimental steel was studied by means of metallographic microscope (OM), white light interferometer, secondary electron image (SEI) and back scattered electron image (BEI).The results show that the wear resistance of GCr15 bearing steel at room temperature is better than that at 100°C, 150°C and 200°C. At room temperature, the main wear forms of GCr15 are adhesion wear and fatigue wear. However, at 100°C, 150°C, 200°C, the friction coefficient and oxidation degree in the wear zone first increase and then decrease with the increase of temperature, and the wear form is mainly oxidized wear, accompanied by abrasive wear.

Tribochemistry in sliding wear of TiCN–Ni-based cermets

2008 ◽  
Vol 23 (5) ◽  
pp. 1214-1227 ◽  
Author(s):  
B.V. Manoj Kumar ◽  
Bikramjit Basu ◽  
Joze Vizintin ◽  
Mitjan Kalin
Keyword(s):  
Friction And Wear ◽  
Wear Behavior ◽  
Bearing Steel ◽  
Wear Loss ◽  
Secondary Carbide ◽  
Pronounced Increase ◽  
Friction And Wear Behavior ◽  
Secondary Carbides ◽  
Low Load ◽  
The Stability

The tailoring of cermet composition to improve tribological properties requires careful choice of the type of secondary carbide. To investigate this aspect, a number of sliding tests were carried out on baseline TiCN–20Ni cermet and TiCN–20wt%Ni–10 wt% XC cermets (X = W/Nb/Ta/Hf) at varying loads of 5N, 20N, and 50N against bearing steel. With these experiments, we attempted to answer some of the pertinent issues: (i) how does the type of secondary carbide (WC/NbC/TaC/HfC) influence friction and wear behavior, and is such influence dependent on load?; and (ii) how does the secondary carbide addition affect the stability and composition of the tribochemical layer under the selected sliding conditions? Our experimental results reveal that the added secondary carbides influence chemical interactions between different oxides and such interactions dominate the friction and wear behavior. A higher coefficient of friction (COF) range, varying from 0.75 to 0.64 was recorded at 5N; whereas the reduced COF of 0.46–0.52 was observed at 20N or 50N. The volumetric wear rate decreased with load and varied on the order of 10−6 to 10−7 mm3/Nm for the cermets investigated. The cermet containing HfC exhibited high friction and poor wear resistance. At low load (5N), the abrasion and adhesion of hard debris containing various oxides dominated the wear, and resulted in high friction and wear loss. In contrast, the more pronounced increase in friction-induced contact temperature (below 500 °C) and compaction of hard debris resulted in the formation of a distinct tribochemical layer at higher loads (20N and 50N). The formation of a dense tribolayer containing oxides of iron and/or titanium is responsible for the reduced friction and wear, irrespective of secondary carbides.

scholarly journals The Role of Transfer Layer on the Sliding Wear Behavior of a Cu-15Ni-8Sn Alloy Under Different Loads

2021 ◽  
Author(s):  
Daoxi Li ◽  
Zhi Wang ◽  
Chao Zhao ◽  
Zongqiang Luo ◽  
wengwen Zhang
Keyword(s):  
Oxide Layer ◽  
Wear Mechanisms ◽  
Applied Load ◽  
Wear Behavior ◽  
Bearing Steel ◽  
Wear Property ◽  
Wear Properties ◽  
Transfer Layer ◽  
Gcr15 Bearing Steel ◽  
Nanocrystalline Particles

Abstract We studied the microstructure of the transfer layer and its effect on the wear mechanism and wear property of an aged Cu-15Ni-8Sn alloy against GCr15 bearing steel during dry sliding by changing the applied load. The results indicate that the aged Cu-15Ni-8Sn alloy shows different wear behavior and wear properties when the applied load changed, where the average friction coefficient and specific wear rate decrease quickly with increasing applied load in steady wear condition. The sample tested under relatively high applied load shows the best wear performance owing the thickest oxide layer exists in the transfer layer. The main wear mechanisms were found changing with varied applied. The metallic nanocrystalline particles and the relative ductile copper oxides promotes the formation of a thick and densified oxide layer. The change of the thickness and morphology of the oxide layer under different load can significantly affect the wear mechanisms.

Laser Surface Hardening of GCr15 Bearing Steel Ring

2010 ◽  
Vol 442 ◽  
pp. 130-136 ◽  
Author(s):  
R. Akhter ◽  
A. Hussain ◽  
W.A. Farooq ◽  
M. Aslam
Keyword(s):  
Surface Hardening ◽  
Laser Power ◽  
Retained Austenite ◽  
Fold Increase ◽  
Spot Size ◽  
Bearing Steel ◽  
Laser Surface ◽  
Beam Shape ◽  
Gcr15 Bearing Steel ◽  
Cw Co2 Laser

Surface hardening of GCr15 bearing steel ring was carried out using CW CO2 laser. The laser power used was in the range of 300 to 500 Watts. A rectangular beam shape was used to cover the area to be hardened. A three fold increase in the hardness of the transformed zone was achieved. The depth of hardness attained was around 1mm. The depth and width of the laser treated zone were studied as function of laser power and working speed for specific spot size. The microstructure of the transformed zone is also discussed. Subzero cooling technique was applied to convert the retained austenite to martensite.

Effect of prior cold ring rolling on carbide dissolution during the austenitizing process of an M50 bearing steel

2020 ◽  
Vol 10 (7) ◽  
pp. 1010-1019
Author(s):  
Jiao Su ◽  
Dongsheng Qian ◽  
Feng Wang
Keyword(s):  
Volume Fraction ◽  
Bearing Steel ◽  
Ring Rolling ◽  
Dissolution Behavior ◽  
Scanning Calorimetry ◽  
Cold Ring Rolling ◽  
The Matrix ◽  
Carbide Dissolution ◽  
The Mean ◽  
Kinetics Of

The influence of prior cold ring rolling (PCRR) on carbide dissolution during the austenitizing process of an M50 bearing steel was investigated by combining microstructural observations with kinetics analysis. The microstructural results show that the PCRR leads to a reduction in the volume fraction and the mean diameter of the undissolved carbides. The matrix of the as-quenched specimens after PCRR is enriched with more carbon and alloying elements than those without PCRR, which further confirms that the dissolution behavior of the alloy carbides is enhanced by PCRR during the austenitizing process. The kinetics of the transformation from ferrite to austenite (α → γ) without and with PCRR are determined by differential scanning calorimetry (DSC) upon heating. The austenite onset (Ac1) and end (Ac3) temperatures both decrease with as the thickness reduction from the PCRR increases. The activation energy for the α → γ transformation is calculated and shows a significant decline when the PCRR process is applied. In addition, the PCRR process results in a slight increase in the hardness regardless of the austenitizing temperature.

scholarly journals Corrosion Resistance of The Bearing Steel 67SiMnCr6-6-4 with Nanobainitic Structure

2015 ◽  
Vol 60 (1) ◽  
pp. 503-509
Author(s):  
E. Skołek ◽  
K. Dudzińska ◽  
J. Kamiński ◽  
W.A. Świątnicki
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Retained Austenite ◽  
Electrochemical Impedance ◽  
Bearing Steel ◽  
Isothermal Quenching ◽  
Tempered Martensite ◽  
Corrosion Properties ◽  
Conventional Heat Treatment ◽  
Quenching And Tempering

AbstractThe paper describes a comparative study of the corrosion resistance of bearing steel 67SiMnCr6-6-4 after two kinds of nanostructuring treatments and two kinds of conventional quenching and tempering treatments. The nanostructuring treatment consisted of austempering with an isothermal quenching at 240°C and 300°C. The conventional heat treatment consisted on quenching and tempering at 350°C for 1 h and quenching and tempering at 550°C for 1 h. Time and temperature of tempering was chosen so that the hardness of both samples (nanostructured as well as quenched and tempered) was similar. The microstructure of steel after each heat treatment was described with the use of transmission electron microscopy (TEM). It was shown, that the austempering conducted at 240°C produced homogenous nanobainitic structure consisting of carbide-free bainite plates with nanometric thickness separated by the layers of retained austenite. The austempering at 300°C produced a sub-micrometric carbide-free bainite with retained austenite in form of layers and small blocks. The conventional heat treatments led to a tempered martensite microstructure. The corrosion resistance study was carried out in Na2SO4acidic and neutral environment using potentiodynamic and electrochemical impedance spectroscopy (EIS) methods. The corrosion resistance of nanostructured steel samples were compared to the steel samples with tempered martensite. The obtained results indicate, that the corrosion resistance of bearing steel with nanobainitic structure is similar to steel with tempered martensite in both acidic and neutral environment. This means that the high density of intercrystalline boundaries in nanobinite does not deteriorate the corrosion properties of the bearing steel.

Sign in / Sign up

Export Citation Format

Share Document