Observation of Retained Austenite Amount of Repeatedly Induction Heated SUJ2 Bearing Steels

2016 ◽  
Vol 867 ◽  
pp. 55-59
Author(s):  
Isamu Yoshida ◽  
Katsuya Yamamoto ◽  
Kenta Domura ◽  
Koshiro Mizobe ◽  
Katsuyuki Kida
Keyword(s):  
Fatigue Strength ◽  
Induction Heating ◽  
Retained Austenite ◽  
High Strength ◽  
Bearing Steel ◽  
Rolling Contact ◽  
High Carbon ◽  
Bearing Steels ◽  
High Fatigue ◽  
The Relationship

Martensitic high-carbon, high-strength bearing steel is used for rolling contact applications when high wear and fatigue resistance are required. Due to its high fatigue strength, SUJ2 is not used for only bearings but for shafts. The objective of this work is a clarification of the relationship between quenching times and retained austenite amount of SUJ2 steel. It was found that repeatedly induction heating increased the retained austenite amount, but did not change the Vickers hardness.

Effect of Repeated Quenching on the Rotating Bending Strength of SAE52100 Bearing Steel

2012 ◽  
Vol 457-458 ◽  
pp. 1025-1031 ◽  
Author(s):  
Koshiro Mizobe ◽  
Edson Costa Santos ◽  
Takashi Honda ◽  
Hitonobu Koike ◽  
Katsuyuki Kida ◽  
...  
Keyword(s):  
Fatigue Strength ◽  
Bending Strength ◽  
High Strength ◽  
Bearing Steel ◽  
Rolling Contact ◽  
High Wear Resistance ◽  
High Carbon ◽  
Austenite Grain ◽  
High Fatigue ◽  
Rotating Bending

Martensitic high carbon high strength SAE 52100 bearing steel is one of the main alloys used for rolling contact applications where high wear resistance are required. Due to its high fatigue strength, SAE 52100 is recently being used not only for the production of bearings but also shafts. Refining of prior austenite grain through repeated quenching is a procedure that can be used to enhance the material’s strength. In this work, the microstructure of repeatedly quenched SAE 52100 steel and its fatigue strength under rotating bending were investigated. It was found that repeated furnace heating and quenching effectively refined the martensitic structure and increased the retained austenite content. Repeated quenching was found to improve the fatigue strength of SAE 52100.

The Quantization of the Structure of Fisheyes via Homology Method

2013 ◽  
Vol 307 ◽  
pp. 409-414 ◽  
Author(s):  
Kazuaki Nakane ◽  
Koshiro Mizobe ◽  
Edson Costa Santos ◽  
Kida Katsuyuki
Keyword(s):  
Fatigue Strength ◽  
Evaluation Method ◽  
High Strength ◽  
Bearing Steel ◽  
Rolling Contact ◽  
High Wear Resistance ◽  
High Carbon ◽  
Optical Micrograph ◽  
High Fatigue ◽  
Rotating Bending

Martensitic high carbon high strength SAE 52100 bearing steel is one of the main alloys used for rolling contact applications where high wear resistance are required. Due to its high fatigue strength, SAE 52100 is recently being used not only for the production of bearings but also shafts. In this work, quenched SAE 52100 steel fatigue strength under rotating bending was investigated. Especially, we focus on “fisheye around inclusion” where the fatigue crack starts. Quantitative evaluation of its optical micrograph has not been enough carried out. In order to develop easy evaluation method for the fisheye area, we apply homology technique to the optical observation.

Influence of Thrice-Induction-Heating and Once-Quenching on Fatigue Strength of SAE52100 Steel

2014 ◽  
Vol 893 ◽  
pp. 415-418 ◽  
Author(s):  
Koshiro Mizobe ◽  
Hitonobu Koike ◽  
Katsuyuki Kida
Keyword(s):  
Fatigue Strength ◽  
Induction Heating ◽  
Heat Affected Zone ◽  
Cooling Water ◽  
High Strength ◽  
Bearing Steel ◽  
Fatigue Tests ◽  
Rolling Contact ◽  
Rotating Bending Fatigue ◽  
Quenching Method

Martensitic high-carbon high-strength SAE 52100 bearing steel is one of the main alloys used as the principal alloys for rolling contact applications. We developed a novel repeated quenching method by induction heating in order to enhance the materials strength. The steel bar passed through the heated coil several times and finally quenched by cooling water. The rotating bending fatigue tests was done in order to investigate the fatigue strength of the steel bars. The heat affected zone (HAZ) was not expanded by the heat treatment however it was found that the thrice-induction-heating and once-quenching improved the fatigue strength. These two features indicated that the size of heat affected zone does not dominate the strength of heated-samples.

Effect of Repeated Induction Heating on Fatigue Crack Propagation in SAE 52100 Bearing Steel

2011 ◽  
Vol 217-218 ◽  
pp. 1266-1271 ◽  
Author(s):  
Hitonobu Koike ◽  
Edson Costa Santos ◽  
Katsuyuki Kida ◽  
Takashi Honda ◽  
Justyna Rozwadowska
Keyword(s):  
Mechanical Properties ◽  
Crack Propagation ◽  
Induction Heating ◽  
High Strength ◽  
Bearing Steel ◽  
Rolling Contact ◽  
Heating Process ◽  
Cyclic Heat Treatment ◽  
Heat Treated ◽  
Cyclic Heat

Martensitic high carbon high strength SAE 52100 bearing steel is one of the main alloys used for rolling contact applications when high wear and fatigue resistance are required. Refining the microstructure of steel improves its mechanical properties (e.g. toughness). In this work SAE 52100 specimens were exposed to repeated induction heating process and rotation bending tests were performed using single- and repeatedly heat-treated material in order to investigate the influence of this cyclic heat treatment on the mechanical properties of SAE 52100. In an attempt to determine the effect of the repeated induction heating and quenching on the material, we focused our observations on the internal fatigue “fisheye" cracks. It was noted that crack propagation was successfully halted by the refined microstructure in heat affected zone, therefore it can be concluded that repeated induction heating and quenching processes help to slow down the propagation of fisheye cracks in SAE52100 steel bars.

Influence of Repeated Quenching on Bearing Steel Martensitic Structure Investigated by Homology

2013 ◽  
Vol 372 ◽  
pp. 270-272 ◽  
Author(s):  
Kazuaki Nakane ◽  
Katsuyuki Kida ◽  
Takashi Honda ◽  
Koshiro Mizobe ◽  
Edson Costa Santos
Keyword(s):  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
High Strength ◽  
Bearing Steel ◽  
Rolling Contact ◽  
High Carbon ◽  
Mathematical Methods ◽  
Heat Treated ◽  
Laser Confocal Microscope ◽  
Steel Heat

JIS SUJ2 (high carbon high strength bearing steel) heat treated by repeated quenching was investigated. The microstructure of the bearing traces was observed after heat treatment by laser confocal microscope. In this paper, by mathematical methods, we try to evaluate quantitatively this change of the structure. Homology is a branch of mathematics that allows quantitative describing characteristics of a figure by replacing the figure with algebra. Applying homology we can express the degree of the connection of the figure. Here we use homology to quantify the change of structures by repeated quenching. Keyword: Homology, Rolling contact fatigue, SUJ2, repeated quenching

Observation of Fisheye Cracks around TiN and Al2O3 Inclusions in Repeatedly Quenched High Carbon Bearing Steel

2012 ◽  
Vol 566 ◽  
pp. 150-156 ◽  
Author(s):  
Koshiro Mizobe ◽  
Takashi Honda ◽  
Hitonobu Koike ◽  
Edson Costa Santos ◽  
Katsuyuki Kida ◽  
...  
Keyword(s):  
High Strength ◽  
Bearing Steel ◽  
Rolling Contact ◽  
High Wear Resistance ◽  
High Carbon ◽  
Austenite Grain Size ◽  
Repeated Heating ◽  
Austenite Grain ◽  
Prior Austenite Grain Size ◽  
Prior Austenite Grain

Martensitic high-carbon high-strength SAE 52100 bearing steel is one of the main alloys used for rolling contact applications where high wear resistance is required. Refining the prior austenite grain size through repeated heating is a process commonly used to enhance the material’s strength. In this work, the microstructure of repeatedly quenched Ti, N-rich ultra-clean SAE 52100 steel was investigated. The material was melted by an electric furnace and formed by continuous casting and forging, and the crack origin on the fracture surface was investigated. It was found repeated furnace quenching effectively refined the martenstic structure.

Improvement of Rolling Contact Fatigue Life of Bearing Steel by Quenching and Partitioning Process

2012 ◽  
Vol 706-709 ◽  
pp. 2152-2157 ◽  
Author(s):  
Kwan Ho Kim ◽  
Jae Seung Lee ◽  
Duk Lak Lee
Keyword(s):  
Fatigue Life ◽  
Silicon Content ◽  
Retained Austenite ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Bearing Steel ◽  
Rolling Contact ◽  
Quenching And Partitioning ◽  
Bearing Steels ◽  
Contact Fatigue Life

Over the decades, the rolling contact fatigue life of bearing steels has been enhanced mainly by the decrease in total oxygen content in the steels which was accomplished by improving steelmaking processes or facilities. However, it has almost been kept constant in the level of 5 ppm since 1990s and, therefore, it is necessary to find out other methods to enhance the RCFL. It is a well-known fact that the RCFL of bearing steels is maximized with the adequate amount of retained austenite and increasing silicon content results in the increase of the resistance to softening during tempering. In the present study, in order to take advantage of the effects of retained austenite and increasing silicon content, a new through-hardening heat treatment, quenching and partitioning (Q&P), has been chosen in place of the conventional quenching and tempering. One of the distinct differences between tempering and partitioning is no fine carbide precipitation during partitioning, leading to the stabilization of retained austenite due to the diffusion of carbon atoms from martensite, which can be realized by increasing silicon content. On the other hand, the increase of silicon content retarded the spheroidization behavior of cementites, requiring higher annealing temperature to assure the complete spheroidization. A new high carbon chromium bearing steel through-hardened by Q&P process showed superior RCFL characteristics to the conventional steel and process.

Quantitative Estimates of Repeatedly Quenched High Carbon Bearing Steel

2013 ◽  
Vol 372 ◽  
pp. 273-276 ◽  
Author(s):  
Kazuaki Nakane ◽  
Koshiro Mizobe ◽  
Edson Costa Santos ◽  
Katsuyuki Kida
Keyword(s):  
Evaluation Method ◽  
Structure Refinement ◽  
High Strength ◽  
Bearing Steel ◽  
Rolling Contact ◽  
High Wear Resistance ◽  
High Carbon ◽  
Austenite Grain Size ◽  
Repeated Heating ◽  
Prior Austenite Grain Size

Martensitic high-carbon high-strength SAE 52100 bearing steel is one of the main alloys used for rolling contact applications where high wear resistance is required. Refining the prior austenite grain size through repeated heating is a process commonly used to enhance the materials strength. In this work, the microstructure of repeatedly quenched Ti, N-rich ultra-clean SAE 52100 steel was investigated. The material was melted by an electric furnace and formed by continuous casting and forging, and the crack origin on the fracture surface was investigated. It was found repeated furnace quenching effectively refined the martenstic structure. In order to further understand the structure refinement we need to develop a new quantitative evaluation method. In this paper, the homology method is applied. We can estimate the situation of refinement quantitatively.

Influence of Repeated Quenching-Tempering on Fisheye Cracks around Tin and Al2O3 Inclusions in SAE 52100 Steel

2013 ◽  
Vol 300-301 ◽  
pp. 1298-1303 ◽  
Author(s):  
Koshiro Mizobe ◽  
Takashi Honda ◽  
Hitonobu Koike ◽  
Edson Costa Santos ◽  
Takuya Shibukawa ◽  
...  
Keyword(s):  
High Strength ◽  
Bearing Steel ◽  
Rolling Contact ◽  
High Carbon ◽  
Austenite Grain Size ◽  
Repeated Heating ◽  
Austenite Grain ◽  
Prior Austenite Grain Size ◽  
Quenching And Tempering ◽  
Prior Austenite Grain

Martensitic high-carbon high-strength SAE 52100 bearing steel has been widely used as the main alloys for rolling contact applications, and also at the components under bending and tension-compression. In order to enhance the material’s strength, refining the prior austenite grain size through repeated heating has been investigated. In this work, the microstructure of repeatedly quenched-tempered Ti, N-rich SAE 52100 steel was investigated. The material was melted by an electric furnace and formed by continuous casting and forging, and the crack origin on the fracture surface was investigated. It was found that repeated furnace quenching and tempering effectively refined the martenstic structure.

Fatigue Strength of Formable Ultra High-Strength TRIP-Aided Steels with Bainitic Ferrite Matrix

2007 ◽  
Vol 345-346 ◽  
pp. 247-250 ◽  
Author(s):  
Koh Ichi Sugimoto ◽  
Junji Tsuruta ◽  
Sung Moo Song
Keyword(s):  
Fatigue Strength ◽  
Fatigue Limit ◽  
Retained Austenite ◽  
Fatigue Crack Initiation ◽  
Bainitic Ferrite ◽  
High Strength ◽  
Ferrite Matrix ◽  
Fatigue Performance ◽  
Refined Microstructure ◽  
High Fatigue

Formable ultra high-strength TRIP-aided steel with bainitic ferrite matrix structure (TBF steel) contributes to a drastic weight reduction and an improvement of crash safety of automobile. In this study, fatigue strength of 0.2%C-1.5%Si-1.5%Mn TBF steels was investigated. High fatigue limit was achieved in TBF steels austempered at 400-450oC, containing a large amount of stable retained austenite. The fatigue limit was linearly related with mobile dislocation density, as well as TRIP effect of retained austenite. When compared to conventional martensitic steel, the TBF steel exhibited lower notch-sensitivity or higher notched fatigue performance. Complex additions of 0.5%Al, 0.05%Nb and 0.2%Mo considerably improved the notched fatigue performance, as well as the smooth fatigue strength. This was associated with the stabilized retained austenite and refined microstructure which suppress fatigue crack initiation and/or propagation.

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