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.

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.

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.

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.

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.

Effect of Twice Quenching on Prior Austenite Grains and Rotating Bending Fatigue Cracks in SUJ2 Steel

2014 ◽  
Vol 620 ◽  
pp. 443-448 ◽  
Author(s):  
Koshiro Mizobe ◽  
Wakana Matsuda ◽  
Masayuki Matsushita ◽  
Takuya Shibukawa ◽  
Katsuyuki Kida
Keyword(s):  
Prior Austenite ◽  
Fatigue Cracks ◽  
High Strength ◽  
Bearing Steel ◽  
Rolling Contact ◽  
Austenite Grain Size ◽  
Repeated Heating ◽  
Bending Fatigue ◽  
Rotating Bending Fatigue ◽  
Rotating Bending

Martensitic high-carbon high-strength SUJ2 bearing steel has been widely used as a main alloy for rolling contact applications, and also in components under bending and tension-compression. In order to enhance the material’s strength, refining the prior austenite grain size through repeated-heating was investigated in our previous work. In this work, we observed the microstructure of twice quenched N-rich SUJ2 steel and performed their rotating bending fatigue tests. It was found that most of cracks on the fracture surface originated from Al2O3 inclusions.

Effect of Repeated Quenching on Rolling Contact Fatigue Properties of JIS SUJ2 Bearing Steel

2016 ◽  
Vol 867 ◽  
pp. 60-65 ◽  
Author(s):  
Takayuki Kamiya ◽  
Yuuki Hashizume ◽  
Koshiro Mizobe ◽  
Katsuyuki Kida
Keyword(s):  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Bearing Steel ◽  
Rolling Contact ◽  
Fatigue Properties ◽  
Austenite Grain Size ◽  
Life Evaluation ◽  
Refinement Method ◽  
Prior Austenite Grain Size ◽  
Work Samples

One important method to improve the material properties is refinement of the prior austenite grain size. Repeated quenching is used as a grain refinement method. In the present work, samples of SUJ2 steel were furnace quenched once and thrice in order to investigate the effect of repeated quenching on rolling contact fatigue (RCF) strength. After the RCF tests, maicrostructure observations, Vickers hardness and retained austenite measurements, RCF life evaluation using the Weibull distribution were carried out. It was found that the dispersion of the life population was reduced by repeatedly quenching.

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 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.

Development of Fracture Surface Etching (FSE) Method around Non-Metallic Inclusion of SUJ2 Steel

2019 ◽  
Vol 971 ◽  
pp. 65-69
Author(s):  
Kenya Tsuji ◽  
Koshiro Mizobe ◽  
Katsuyuki Kida
Keyword(s):  
Fracture Surface ◽  
Fatigue Testing ◽  
High Hardness ◽  
High Strength ◽  
Bearing Steel ◽  
Rolling Contact ◽  
High Wear Resistance ◽  
Material Microstructure ◽  
Surface Etching ◽  
Al2o3 Inclusion

High-carbon high-strength JIS-SUJ2 bearing steel is one of the alloys used as rolling contact applications which need high wear resistance. This high hardness material is broken from non-metallic inclusions under fatigue stress. In this work, we developed a new observation method “fracture surface etching (FSE)” in order to observe the material microstructure on the fracture surface. We succeeded to draw clear grain boundaries on the fracture surfaces and closely observed the material microstructure around the crack origins by the FSE method. We concluded that the crack initiation area boundary is not formed by only the grain boundary, and the grain size around the Al2O3 inclusion on the fracture surface was similar to that of the flat surface which does not have inclusions before fatigue testing.

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