Macrostructure, microstructure and mechanical properties evolution during 8Cr4Mo4V steel roller bearing inner ring forging process

Jiang, Hongwei; Song, Yanran; Wu, Yucheng; Shan, Debin; Zong, Yingying

doi:10.1016/j.msea.2020.140196

Cited by 33 publications

(10 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…From the experimental heat A, two pieces of forging ingots were cast, each weighing about 23 t. A teeming ladle with a larger diameter of ladle nozzle (90 mm) than in that of [ 31 ] was chosen for casting to avoid clogging [ 15 , 16 , 17 ]. To prevent reoxidation of the steel by atmospheric oxygen, the casting stream was protected with argon.…”

Section: Resultsmentioning

confidence: 99%

“…One of the key fields is undoubtedly power engineering, especially renewable sources, where heavy and long forgings are used, for example, for rotor shafts of wind turbines [10][11][12][13][14]. The input semifinished product for the production of these shafts is heavy steel ingots, in which there may be problems with achieving the required internal quality due to the occurrence of a very inhomogeneous and coarse-grained structure [15][16][17][18]. immersion nozzles occurs during steel casting with oxides of these elements.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Effect of Rare Earth Metals Alloying on the Internal Quality of Industrially Produced Heavy Steel Forgings

Jonšta

Brožová

et al. 2021

Materials

View full text Add to dashboard Cite

The paper presented the findings obtained by industrial research and experimental development on the use of rare earth metals (REMs) in the production of heavy steel ingots and their impact on the internal quality of the 42CrMo4 grade steel forging. REMs alloying was carried out after vacuuming the steel. A relatively large melting loss of cerium (about 50%) and its further decrease in casting due to reoxidation were observed. Refinement of structure and better mechanical properties of forged bar containing about 0.02 wt.% of Ce compared to that of the standard production were not achieved. The wind power shaft with content of about 0.06 wt.% of Ce showed high amount of REM inclusions, which were locally chained, and in some cases, initiated cracks. Four stoichiometrically different types of REM inclusions were detected in forgings, namely (La-Ce)2O2S + (La-Ce)O2 + SiO2 (minority); oxygen, phosphorus, arsenic, and antimony bound to lanthanum and cerium probably bonded with iron oxides La + Ce, MgO, Al2O3 a SiO2; (La-Ce)2O2S, FeO, SiO2, and CaO or CaS.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Effect of Rare Earth Metals Alloying on the Internal Quality of Industrially Produced Heavy Steel Forgings

Jonšta

Brožová

et al. 2021

Materials

View full text Add to dashboard Cite

show abstract

“…The parameter A could be obtained according to Equation (11). Figure 5e exhibits the relationship between lnZ against ln[sinh(ασ p )].…”

Section: Constitutive Equation and Verificationmentioning

confidence: 99%

“…The hot processing process of aeroengine bearing rings has an important impact on the service performance of aeroengine bearings, [ 11 ] and hot processing map is an effective method to guide the hot processing process, [ 12 ] which has been studied by a large number of researchers. Chen et al [ 13 ] established the hot processing map of the second‐generation bearing steel M50 through the isothermal compression of 900–1150 °C, 0.01–10 s −1 , and determined that the optimal thermal working range was 1070–1150 °C, 0.01–1 s −1 .…”

Section: Introductionmentioning

confidence: 99%

Investigation on Improved Hot Processing Map of Cr₄Mo₄Ni₄V Aerospace Bearing Steel Based on Carbide Content

et al. 2023

Self Cite

View full text Add to dashboard Cite

Cr4Mo4Ni4V steel has excellent fracture toughness and fatigue life, which is one of the main materials for the new generation of aeroengine bearing rings. However, there is still lack of investigation on hot processing of Cr4Mo4Ni4V steel up to now. Herein, the hot processing map is established based on systemic compression tests; then, according to the requirements of Cr4Mo4Ni4V steel for carbide content, improved hot processing map is established based on the carbide content by superimposing the carbide content zoning map. Results reveal that the activation energy is 304.9 kJ mol−1, and power dissipation value increases only within the strain range of 0.2–0.4, while the instability zone always moves toward the direction of high strain rate with the increase of strain. In 900–1150 °C, 0.01–5 s−1, the content of carbide could be divided into three zones: little dissolved zone, mostly dissolved zone, and completely dissolved zone. Improved hot processing map indicates that the ideal processing domain is 950–1050 °C, 0.01–0.3 s−1 etc.

show abstract

“…Hot rolling as a thermoplastic process that shows superior plasticity, usually results in coarse grain due to long-term insulation at high-temperature. Meanwhile, the microstructure after hot rolling is mainly composed of martensite in M50 steel, which needs to be subjected to the spheroidizing annealing (SA) for subsequent cutting [6]. As for the cold rolling, the grain refinement [7,8] and solution strengthening effect can be achieved to improve the strength and toughness of bearing steels [9].…”

Section: Introductionmentioning

confidence: 99%

Rapid Spheroidizing Annealing via Combining Warm Deformation with Divorced Eutectoid Transformation in M50 Steel

Qian

Chen

Wang

et al. 2022

Metals

View full text Add to dashboard Cite

In this work, a novel routine to realize the rapid spheroidizing annealing (SA) process has been proposed in M50 steel via combining warm deformation (WD) and divorced eutectoid transformation (DET). In this process, the sample is first subjected to partial austenitizing to realize the partial dissolution of carbides, then slowly cooled to DET temperature for WD. Finally, the sample is slowly cooled to below the eutectoid transformation temperature to complete the SA. The results show that an excellent spheroidized microstructure can be obtained via the rapid SA process within 2 h. The finest spheroidized carbide (0.295 μm), as well as an appropriate hardness (217 HV), is achieved when the WD and DET processes are conducted at 760 °C. This should be attributed to that the WD not only accelerates the DET but also can break the primary carbides, leading to the uniformly distributed and refined carbides. In addition, the proposed WD that realizes rapid SA shows the excellent roundness of spheroidized carbides compared with the traditional cold/hot deformation which needs a long-term SA process. This work provides a highly efficient routine to simultaneously realize the SA and shape forming, which is of great engineering significance for the manufacturing of bearings.

show abstract

Macrostructure, microstructure and mechanical properties evolution during 8Cr4Mo4V steel roller bearing inner ring forging process

Cited by 33 publications

References 29 publications

The Effect of Rare Earth Metals Alloying on the Internal Quality of Industrially Produced Heavy Steel Forgings

The Effect of Rare Earth Metals Alloying on the Internal Quality of Industrially Produced Heavy Steel Forgings

Investigation on Improved Hot Processing Map of Cr₄Mo₄Ni₄V Aerospace Bearing Steel Based on Carbide Content

Rapid Spheroidizing Annealing via Combining Warm Deformation with Divorced Eutectoid Transformation in M50 Steel

Contact Info

Product

Resources

About

Macrostructure, microstructure and mechanical properties evolution during 8Cr4Mo4V steel roller bearing inner ring forging process

Cited by 33 publications

References 29 publications

The Effect of Rare Earth Metals Alloying on the Internal Quality of Industrially Produced Heavy Steel Forgings

The Effect of Rare Earth Metals Alloying on the Internal Quality of Industrially Produced Heavy Steel Forgings

Investigation on Improved Hot Processing Map of Cr4Mo4Ni4V Aerospace Bearing Steel Based on Carbide Content

Rapid Spheroidizing Annealing via Combining Warm Deformation with Divorced Eutectoid Transformation in M50 Steel

Contact Info

Product

Resources

About

Investigation on Improved Hot Processing Map of Cr₄Mo₄Ni₄V Aerospace Bearing Steel Based on Carbide Content