Microstructure and Properties of 1.0C-1.5Cr Bearing Steel in Processes of Hot Rolling, Spheroidization, Quenching, and Tempering

2019 ◽  
Vol 90 (3) ◽  
pp. 1800470 ◽  
Author(s):  
Chang-Sheng Li ◽  
Zhen-Xing Li ◽  
Jin-Yi Ren ◽  
Xing-Yang Tu ◽  
Bin-Zhou Li
Keyword(s):  
Hot Rolling ◽  
Bearing Steel ◽  
Microstructure And Properties ◽  
Quenching And Tempering

scholarly journals Effect of Hot Rolling on Microstructural Evolution and Wear Behaviors of G20CrNi2MoA Bearing Steel

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 957
Author(s):  
Guanghua Zhou ◽  
Wenting Wei ◽  
Qinglong Liu
Keyword(s):  
Grain Boundaries ◽  
Hot Rolling ◽  
Carbon Concentration ◽  
Hot Deformation ◽  
Volume Fraction ◽  
Large Angle ◽  
Bearing Steel ◽  
Rolling Reduction ◽  
Effect Of Hot Rolling ◽  
Quenching And Tempering

Hot rolling can improve the mechanical properties after heat treatment by improving the microstructure. The effect of hot rolling (HR) deformation on the microstructural transformation of G20CrNi2MoA bearing steel in the subsequent CQT (carburizing-quenching and tempering) and RQT (reheating-quenching and tempering) processes was studied. The results indicate that the austenite grain size decreased by 20% after 45% hot rolling reduction, and the number of large-angle grain boundaries increased due to the recovery and recrystallization induced by hot deformation. The refinement effect of hot deformation on austenite grains was retained after dual austenitizing, and the large-angle grain boundaries and massive dislocation in the grains caused by hot deformation promoted the diffusion of carbon atoms during carburization, resulting in a higher surface carbon concentration. The refined grains and higher carbon concentration affected the volume fraction and size of undissolved carbides in RQT specimens. When the initial hot rolling reduction reached 45%, the average particle size of carbides decreased by 40%, and the area volume fraction increased by 37%. The Vickers hardness increased, but the friction coefficient and wear rate were significantly reduced with the increase in the initial hot rolling reduction. The main reasons for the improved wear resistance were fine grains, superior carbide distribution and high hardness.

Network Carbide Inheritance during Heat Treatment Process of Large Shield Machine Bearing Steel GCr15SiMn

2015 ◽  
Vol 817 ◽  
pp. 115-120 ◽  
Author(s):  
Dan Zhang ◽  
Le Yu Zhou ◽  
Chao Lei Zhang ◽  
Chao Huang ◽  
Min Zhao ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Treatment Process ◽  
Bearing Steel ◽  
Treatment Temperature ◽  
Heat Treatment Process ◽  
Soaking Time ◽  
Hot Rolled ◽  
Chinese Standard ◽  
Shield Machine ◽  
Quenching And Tempering

Network carbide inheritance during heat treatment process of large shield machine bearing steel GCr15SiMn was investigated by heat treatment experiments and quantitative metallographic. Samples with the proeutectoid cementite network thickness in the range of 0.19~0.54 μm were obtained by changing austenitizing temperature and soaking time of pearlite transformation. The results show that the network in hot rolled bar can be improved when the pre-heat treatment temperature is 950 °C. When the network thickness is above 0.40 μm, the undissolved cementite networks present in microstructures after quenching and tempering. In a Chinese standard, the network grades are 1.5 and 3.0 degree when the networks thickness are 0.40 μm and 0.54 μm, respectively. The critical network thickness that can be eliminated by heat treatment is 0.29 μm.

Effects of Hot Rolling on Microstructure and Properties of FeCoNi1.5CrCu/2024Al Composites

2021 ◽  
pp. 163393
Author(s):  
Yuwei Yan ◽  
Guirong Li ◽  
Wenxiang Ren ◽  
Hongming Wang ◽  
Lipeng Gao
Keyword(s):  
Hot Rolling ◽  
Microstructure And Properties

Formulation Design and Experiments of Emulsion for Rolling Process of Magnesium Alloy

2011 ◽  
Vol 239-242 ◽  
pp. 2233-2239
Author(s):  
Zhi Qian Chen ◽  
Wen Bin Yu ◽  
Mei Tao Ouyang
Keyword(s):  
Magnesium Alloy ◽  
Hot Rolling ◽  
Anionic Surfactants ◽  
Rolling Process ◽  
Formulation Design ◽  
Base Oil ◽  
Microstructure And Properties ◽  
Hot Rolling Process ◽  
Main Components ◽  
Emulsifier Concentration

The formulation design and fundamental experiments of O/W type emulsions as lubricant and coolant in the hot rolling process of magnesium alloy were conducted in this work. The main components of emulsion were determined by the comparision of some candidates of base oil, polar oil additive and emulsifier in microstructure and properties, respectively. It is found that the conservation stability of emulsions is mainly dominated by the emulsifier concentration and type. The results showed that the suitable stability and microstructure was obtained by using compound emulsifier of nonionic and anionic surfactants. The feasible contents of both emulsifier and polar agents are about 10 percent, respectively.

Study on the Microstructure and Properties of Prehardened Plastic-Mould SWFT Steel for Big Section

2007 ◽  
Vol 353-358 ◽  
pp. 1629-1632 ◽  
Author(s):  
Yi Luo ◽  
Xiao Chun Wu ◽  
Hong Bin Wang ◽  
Yong An Min
Keyword(s):  
Carbon Content ◽  
Comparative Experiment ◽  
Large Section ◽  
Microstructure And Properties ◽  
The Stability ◽  
Quenching And Tempering ◽  
Plastic Mould

In order to develop the prehardened plastic-mould SWFT steel for big section without quenching and tempering, the influence of carbon on the microstructure and corresponding hardness of steel under both air and sand cooling were investigated. It was demonstrated that when the carbon content of steels increased, the stability of overcooling austenite increased and the hardness difference decreased because of the decrease of bulk ferrite and the increase of bainite. The microstructure of No.8 steel under both air and sand cooling was mostly bainite and the hardness difference was less than 3HRC.And the No.8 steel had good machineability by the turning comparative experiment of No.8 steel and 45# steel. The prehardened plastic mould SWFT steel for big large section was produced successfully based on the experiment result.

Effect of Different Cooling Paths on the Microstructure and Properties of a Plain Carbon Steel

2013 ◽  
Vol 762 ◽  
pp. 171-175
Author(s):  
Jin Guo ◽  
Shui Ping Hu ◽  
Zhen Li Mi ◽  
Dong Bin Zhang
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Carbon Steel ◽  
Hot Rolling ◽  
Plain Carbon Steel ◽  
Controlled Cooling ◽  
Microstructure And Properties ◽  
Ultra Fast Cooling ◽  
Cooling Method ◽  
Fast Cooling

The effect of different cooling paths on the microstructure and properties of a plain carbon steel was carefully investigated by thermal simulation, hot rolling, tensile tests and quantitative metallography. Experimental results indicate that the more rapid the cooling rate is, the smaller the average ferritic grain size is and the higher the mechanical properties are. Both ultra fast cooling method and ultra fast cooling+accelerated controlled cooling method could refine grain size and improve mechanical properties. Without any alloy addition, using the ultra fast cooling immediately after hot rolling process, the yield strength of the plain carbon steel could reach 360 MPa and the elongation is 32%.

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