Effects of Shot-Peening on Cr-Rare Earth-Boronizing at Low Temperature for Medium Carbon Steel

2010 ◽  
Vol 97-101 ◽  
pp. 437-441 ◽  
Author(s):  
Bin Xu ◽  
Ren Hong Guo ◽  
Zhong Quan Ma ◽  
Cai Gao ◽  
Xiao Hong Fan
Keyword(s):  
Activation Energy ◽  
Rare Earth ◽  
Carbon Steel ◽  
Low Temperature ◽  
Shot Peening ◽  
Medium Carbon Steel ◽  
Diffusion Activation Energy ◽  
Boron Diffusion ◽  
Layer Depth ◽  
Medium Carbon

Effects of shot-peening on Cr-Rare earth-boronizing at 650°C for 4 – 8h for medium carbon steel are investigated in this paper. The value difference in boron diffusion activation energy between shot-peening and undeformation is calculated. The layer depth, microhardness and brittleness are also analyzed. The results show that the activation energy has a decrease of 5647.78 J/mol after shot-peening for 1.5h, and the layer depth increases with prolonged shot-peening time. The layer can also retain its high hardness with low brittleness. The analysis indicates that shot-peening can provide a large number of crystal lattice defects that facilitates boron diffusion in the steel, and the low temperature is apt to remain high dislocation density.

Neutron diffraction study of the kinetics of low-temperature martensite decomposition in medium-carbon steel

2021 ◽  
Vol 6 ◽  
pp. 83-87
Author(s):  
A. A. Alekseev ◽  
◽  
S. S. Goncharov ◽  
Keyword(s):  
Solid Solution ◽  
Carbon Steel ◽  
Low Temperature ◽  
Neutron Diffraction ◽  
Supersaturated Solid Solution ◽  
Medium Carbon Steel ◽  
Tempering Temperature ◽  
Medium Carbon ◽  
Temperature Decomposition ◽  
Two Stages

It is found that the low-temperature decomposition of martensite in quenched medium-carbon steel occurs in two stages. In the first stage, the rate of decomposition is higher than that in the subsequent stage. Application of the neutron diffraction method allows the identification of two stages of transformation in the first stage of martensite decomposition. It is shown that the first stage is associated predominantly with carbon segregation at dislocations, and the second, with the outdiffusion of carbon from the supersaturated solid solution with the formation of dispersed particles of metastable carbides. It is shown that the change in the concentration of carbon and, accordingly, the degree of tetragonal lattice of martensite at aging and low tempering occurs to a certain limit, independent of the cooling rate during quenching and tempering temperature. This is due to the establishment of a relative equilibrium between a supersaturated solid solution and fine particles of metastable iron carbide. It is found that the determining process, which leads to a change in the microhardness the low-temperature decomposition, is the out diffusion of carbon from the supersaturated solid solution.

Microstructure control of medium carbon steel joints by low-temperature linear friction welding

2019 ◽  
Vol 25 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Ryosuke Kuroiwa ◽  
Huihong Liu ◽  
Yasuhiro Aoki ◽  
Sungook Yoon ◽  
Hidetoshi Fujii ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Low Temperature ◽  
Friction Welding ◽  
Medium Carbon Steel ◽  
Linear Friction Welding ◽  
Microstructure Control ◽  
Medium Carbon ◽  
Linear Friction ◽  
Steel Joints

Low temperature nitriding of medium carbon steel

Vacuum ◽  
2006 ◽  
Vol 80 (8) ◽  
pp. 855-859 ◽  
Author(s):  
Jisen Wang ◽  
Guosong Zhang ◽  
Jinquan Sun ◽  
Ying Bao ◽  
Lichen Zhuang ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Low Temperature ◽  
Medium Carbon Steel ◽  
Medium Carbon

scholarly journals Linear Friction Stir Welding of Medium Carbon Steel at Low Temperature

2019 ◽  
Vol 59 (10) ◽  
pp. 1853-1859 ◽  
Author(s):  
Yasuhiro Aoki ◽  
Ryosuke Kuroiwa ◽  
Hidetoshi Fujii ◽  
Gen Murayama ◽  
Masanori Yasuyama
Keyword(s):  
Friction Stir Welding ◽  
Carbon Steel ◽  
Low Temperature ◽  
Medium Carbon Steel ◽  
Medium Carbon ◽  
Friction Stir ◽  
Linear Friction
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