scholarly journals Increasing the fatigue limit of a high-strength bearing steel by a deep cryogenic treatment

2010 ◽  
Vol 240 ◽  
pp. 012059 ◽  
Author(s):  
E Kerscher ◽  
K-H Lang
Keyword(s):  
Fatigue Limit ◽  
Cryogenic Treatment ◽  
High Strength ◽  
Bearing Steel ◽  
Deep Cryogenic Treatment

scholarly journals Wear evaluation and microstructure analysis of cryogenically treated AISI 440C Bearing steel

2021 ◽  
Author(s):  
Idayan A ◽  
C. Elanchezhian ◽  
B. Vijaya Ramnath ◽  
Palanikumar K
Keyword(s):  
Wear Resistance ◽  
Cryogenic Treatment ◽  
Research Work ◽  
Bearing Steel ◽  
X Ray Diffraction ◽  
Deep Cryogenic Treatment ◽  
X Ray ◽  
Heat Treated ◽  
Increase Wear Resistance ◽  
Wear Evaluation

In this research work, two types of cryogenic treatment such as deep cryogenic treatment (-196oC) and shallow cryogenic treatment (-80oC) have been adopted for wear resistance to increase in AISI 440C bearing steel. This paper has been focused to increase Wear Resistance (WR) through deep micro structural analyses, and also attention has been made to correlate the microstructure with the wear character of Deep Cryogenic treated (DCT) specimens, Conventional Heat Treated (CHT) specimens and Shallow Cryogenic Treated (SCT) specimens. Micro structural examinations have been carried out in the specimens through Scanning Electron Microscopy (SEM), Energy Dispersive Analysis of X-ray (EDAX) and X-Ray Diffraction (XRD). Wear characteristics of AISI 440C bearing steel has been studied. The outcome of the research disclosed that the DCT specimens have higher wear resistance than SCT and CHT specimens. The effective wear mechanisms recognized were the constitution of white layers and delamination of white layers. The microstructures of the materials have been varied through heat treatment process. The modification of Secondary Carbides (SCs) precipitation characteristics and its reduction of retained austenite in the microstructure have been correlated with wear character and these are the liable mechanism to raise the wear resistance of bearing steels through DCT.

Effect of Deep Cryogenic Treatment on Wear Resistance of AISI 52100 Bearing Steel

2014 ◽  
Vol 67 (6) ◽  
pp. 909-917 ◽  
Author(s):  
Ibrahim Gunes ◽  
Adem Cicek ◽  
Kubilay Aslantas ◽  
Fuat Kara
Keyword(s):  
Wear Resistance ◽  
Cryogenic Treatment ◽  
Bearing Steel ◽  
Deep Cryogenic Treatment ◽  
Aisi 52100

scholarly journals Development mechanical and fatigue properties of AA7001 after combined SP with deep cryogenic treatment and UIP with deep cryogenic treatment

2021 ◽  
Vol 5 (1(113)) ◽  
pp. 62-69
Author(s):  
Aseel A. Alhamdany ◽  
Ali Yousuf Khenyab ◽  
Qusay K. Mohammed ◽  
Hussain Jasim M. Alalkawi
Keyword(s):  
Crack Nucleation ◽  
Fatigue Behavior ◽  
Low Cost ◽  
Rapid Development ◽  
Cryogenic Treatment ◽  
High Strength ◽  
Fatigue Properties ◽  
Deep Cryogenic Treatment ◽  
Tensile Test Specimen ◽  
Specific Strength

Al alloys have long been of interest to the aerospace community, due to their modest specific strength, ease of manufacture, and low cost. In recent years, with the rapid development of weaponry, 7XXX ultra-high strength aluminum alloys used increasingly in military fields. Chemical analysis of the AA 7001 is supported out at The Company State for Engineering, Rehabilitation and Inspection (SIER) in Iraq. Strengthening the surface (shot penning) is beneficial to delay crack nucleation and extend life. The test samples (tensile and fatigue) are subject to the SP process by using ball steel with the parameters (Pressure=12 bars, Speed=40 mm/min, Distance=150 mm, Shot size=2.25 mm, Coverage=100 %). The ultrasonic impact treatment (UIP) machine is used for enhancing the surface properties. For the Deep Cryogenic Treatment (DCT), the samples have been placed in the cooling chamber. A standard tensile test specimen is prepared in a round section with the dimensions chosen according to ASTM (A370-11). Tensile and fatigue of rotating bending with R=–1 have been conducting, after the effect of deep cryogenic treatment (DCT), combined shot peening (SP+DCT), and ultrasonic impact peening (UIP+DCT) of AA7001 have been examining. The maximum improvement percent in ultimate tensile strength (UTS) due to (DCT), (SP+DCT), and (UIP+DCT) were about 3 %, 8.27 %, and 6.25 %, respectively. The rise in the yield stress due to (DCT), (SP+DCT), and (UIP+DCT) were 9.5 %, 14.6 %, and 13.14 %, respectively. The ductility reduced by constituents of 8.57 %, 12.5 %, and 11.42 % sequentially. The improvement in fatigue strength in a high cycle regime is 16 % for (SP+DCT) due to combined effects, it is an 8 % increase in the endurance limit on fatigue behavior due to inducing compressive residual stress (CRS)

scholarly journals Influence of Deep Cryogenic Treatment on Microstructure and Properties of 7A99 Ultra-High Strength Aluminum Alloy

Metals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 631 ◽  
Author(s):  
Wenlin Gao ◽  
Xiangjie Wang ◽  
Junzhou Chen ◽  
Chunyan Ban ◽  
Jianzhong Cui ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Electron Backscatter Diffraction ◽  
Fatigue Behavior ◽  
Cryogenic Treatment ◽  
Aging Treatment ◽  
High Strength ◽  
Atom Probe ◽  
Homogeneous Distribution ◽  
Deep Cryogenic Treatment ◽  
High Strength Aluminum Alloy

The hardness, toughness, wear resistance, and fatigue behavior of materials can be improved through a deep cryogenic treatment (DCT). During this treatment, low temperatures (−100 °C to −196 °C) are maintained and then increased to room or higher. In this work, an indirect-extrusion plate of 7A99 ultra-high strength aluminum alloy was subjected to a T6 (peak aging) treatment and a T6-DCT treatment. The influence of the T6-DCT treatment on the mechanical properties, grain morphologies, precipitates, and atom–cluster distribution was investigated via tensile testing, electron backscatter diffraction, transmission electron microscopy, and three-dimensional atom probe analysis. The tensile strength (maximum: 705 deep cryogenic treatment), yield strength (maximum: 678 MPa), and elongation (maximum: 14%) of the T6-DCT-treated alloy were higher than those of the T6-treated alloy. Moreover, the T6-DCT treatment resulted in (i) grain size refinement and increased uniformity of the microstructure (homogeneous distribution of η’-MgZn2- and η-phase precipitates), and (ii) reduced segregation degree of Zn, Mg, and Cu atoms in the matrix (fraction of small atom clusters (sizes: 10–20 nm, 20–50 nm) increased, fraction of large clusters (size: >1,000 nm) decreased). Therefore, DCT can refine the precipitates and increase the uniformity of the precipitate distribution, thereby improving the strength and plasticity of the alloy.

Sign in / Sign up

Export Citation Format

Share Document