The Effect of Isothermal Heat Treatment on the Rolling Contact Fatigue of Carburized Low Carbon Microalloyed Steel

2007 ◽  
pp. 151-154
Author(s):  
Jae Seong Lee ◽  
Bok Han Song ◽  
H. G. Sung ◽  
S. Y. Kim ◽  
Bo Young Hur
Keyword(s):  
Heat Treatment ◽  
Microalloyed Steel ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Isothermal Heat Treatment ◽  
Low Carbon ◽  
Carbon Microalloyed

The Effect of Isothermal Heat Treatment on the Rolling Contact Fatigue of Carburized Low Carbon Microalloyed Steel

2007 ◽  
Vol 544-545 ◽  
pp. 151-154
Author(s):  
Jae Seong Lee ◽  
Bok Han Song ◽  
H. G. Sung ◽  
S. Y. Kim ◽  
Bo Young Hur
Keyword(s):  
Heat Treatment ◽  
Fatigue Life ◽  
Microalloyed Steel ◽  
Rolling Contact Fatigue ◽  
Hot Forging ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Isothermal Heat Treatment ◽  
Low Carbon ◽  
Austenite Grain

In case of the low carbon chromium steel that have widely been used for the carburized gears or rolling bearings, the austenite grain coarsening may be occasionally occurred during carburizing. To restrain this phenomenon, most of hot forged parts have been given to an isothermal heat treatment or normalizing immediately after hot forging and/or prior to carburizing. Therefore, their production cost includes unexpected additional expenses caused by such a non-value added process. To confirm the possibility of an energy saving, as well as attaining a superior fatigue life, in the production of automotive parts to be carburized, the austenite grain coarsening with the manufacturing process of the microalloyed steel, containing Nb and B as a grain refining elements, was investigated. The heat treatment characteristics and rolling contact fatigue behavior of the carburized specimens with the isothermal heat treatment were also investigated. In spite of omitting the isothermal heat treatment after hot forging, the abnormally coarse austenite grains were not found out in the carburized specimens. However, the rolling contact fatigue life of the carburized specimens, in which the isothermal heat treatment was omitted, was shorter than that of isothermally heat-treated specimens.

scholarly journals Influence of Microstructure on Mechanical Properties of Bainitic Steels in Railway Applications

Metals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 778 ◽  
Author(s):  
Omid Hajizad ◽  
Ankit Kumar ◽  
Zili Li ◽  
Roumen H. Petrov ◽  
Jilt Sietsma ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Mechanical Behavior ◽  
Mechanical Performance ◽  
Electron Backscatter Diffraction ◽  
Bainitic Ferrite ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Uniaxial Tensile ◽  
Isothermal Heat Treatment

Wheel–rail contact creates high stresses in both rails and wheels, which can lead to different damage, such as plastic deformation, wear and rolling contact fatigue (RCF). It is important to use high-quality steels that are resistant to these damages. Mechanical properties and failure of steels are determined by various microstructural features, such as grain size, phase fraction, as well as spatial distribution and morphology of these phases in the microstructure. To quantify the mechanical behavior of bainitic rail steels, uniaxial tensile experiments and hardness measurements were performed. In order to characterize the influence of microstructure on the mechanical behavior, various microscopy techniques, such as light optical microscopy (LOM), scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD), were used. Three bainitic grades industrially known as B360, B1400 plus and Cr-Bainitic together with commonly used R350HT pearlitic grade were studied. Influence of isothermal bainitic heat treatment on the microstructure and mechanical properties of the bainitic grades was investigated and compared with B360, B1400 plus, Cr-Bainitic and R350HT in as-received (AR) condition from the industry. The results show that the carbide-free bainitic steel (B360) after an isothermal heat treatment offers the best mechanical performance among these steels due to a very fine, carbide-free bainitic microstructure consisting of bainitic ferrite and retained austenite laths.

Effect of deposition material and heat treatment on wear and rolling contact fatigue of laser cladded rails

Wear ◽  
2018 ◽  
Vol 412-413 ◽  
pp. 69-81 ◽  
Author(s):  
Taposh Roy ◽  
Quan Lai ◽  
Ralph Abrahams ◽  
Peter Mutton ◽  
Anna Paradowska ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact

Influence of steel cleanliness and heat treatment conditions on rolling contact fatigue of 100Cr6

Wear ◽  
2019 ◽  
Vol 430-431 ◽  
pp. 272-279 ◽  
Author(s):  
M. Oezel ◽  
T. Janitzky ◽  
P. Beiss ◽  
C. Broeckmann
Keyword(s):  
Heat Treatment ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Treatment Conditions ◽  
Steel Cleanliness

Influence of Cyclic Heat Treatment and Oxygen Content on the Rolling Contact Fatigue of JIS SUJ2 Bearings

2011 ◽  
Vol 217-218 ◽  
pp. 982-987 ◽  
Author(s):  
Edson Costa Santos ◽  
Katsuyuki Kida ◽  
Takashi Honda ◽  
Justyna Rozwadowska ◽  
K. Houri ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Oxygen Content ◽  
Retained Austenite ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Fatigue Properties ◽  
Cyclic Heat Treatment ◽  
Austenite Grain Size ◽  
Cyclic Heat

In this work, two SAE 52100 grades with different oxygen contents were repeatedly quenched and the influence of this cyclic heat treatment as well as the role of the oxygen content level on the mechanical properties of the material were investigated by rolling contact fatigue tests. The repeated quenching process increased the retained austenite content and had little influence on the material’s hardness. The prior austenite grain size was decreased and consequently, refinement of the martensitic phase in both types of materials occurred. The higher content of the retained austenite (higher fracture toughness) and the refinement of the microstructure accounted for the higher fatigue properties of the repeatedly quenched material. Flaking failure was present in the material quenched only once, after 4.3x107 cycles (higher oxygen content) and 108 cycles (lower oxygen content). Flaking failure did not occur in the samples treated by repeated quenching. The results show the importance of both optimized heat treatment and alloy cleanness for the lifetime of bearing steel.

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