Effect of Deep Cryogenic Treatment on the Microstructure and Corrosion Behavior of the Microarc Oxidized Mg-Zn-Ca Alloy

2019 ◽  
Author(s):  
Yaokun Pan ◽  
Jingtao Wang ◽  
Rui Feng ◽  
Benkui Gong ◽  
Hongwei Cui ◽  
...  
Keyword(s):  
Corrosion Behavior ◽  
Cryogenic Treatment ◽  
Deep Cryogenic Treatment

scholarly journals Effect of deep cryogenic treatment on the microstructure and corrosion behavior of the microarc oxidized Mg-2.0Zn-0.5Ca alloy

2020 ◽  
Vol 9 (3) ◽  
pp. 3943-3949
Author(s):  
Yaokun Pan ◽  
Jingtao Wang ◽  
Hongwei Cui ◽  
Rui Feng ◽  
Benkui Gong ◽  
...  
Keyword(s):  
Corrosion Behavior ◽  
Cryogenic Treatment ◽  
Deep Cryogenic Treatment

scholarly journals Effect of Deep Cryogenic Treatment on Corrosion Behavior of AISI H13 Die Steel

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7863
Author(s):  
Tarang Shinde ◽  
Catalin Pruncu ◽  
Narendra B. Dhokey ◽  
Anca C. Parau ◽  
Alina Vladescu
Keyword(s):  
Grain Boundary ◽  
Corrosion Behavior ◽  
Open Circuit Potential ◽  
Cryogenic Treatment ◽  
Open Circuit ◽  
Deep Cryogenic Treatment ◽  
Die Steel ◽  
Heat Treated ◽  
Aisi H13 ◽  
H13 Die Steel

AISI H13 die steel specimens were subjected to heating at 1020 °C followed by oil quenching and double tempering at 520 °C. Subsequently, these specimens were subjected to deep cryogenic treatment at −185 °C in liquid nitrogen environment for 16 h and then subjected to soft tempering at 100 °C once the specimens attained room temperature. Thereafter, the specimens were subjected to scanning electron microscopy (SEM) analysis and electron backscatter diffraction (EBSD) analysis. The electrochemical corrosion activity was investigated in 3.5% NaCl at 23 ± 0.5 °C by evaluating the evolution of open circuit potential over time and potentiodynamic curves, and electrochemical impedance spectroscopy study was also carried out. The heat-treated specimens exhibited better resistance to corrosion through more electropositive values of open circuit potential. This could be attributed to lower grain boundary area in heat-treated specimens as compared to 16 h cryogenically treated specimen as higher grain boundary areas behave as an anode in an electrochemical cell, thereby enhancing the rate of corrosion. According to electrochemical tests, the cryogenically treated surface is more resistant to corrosion, followed by heated alloy. However, both surface modification treatments improved the corrosion behavior of the untreated alloy.

scholarly journals Effect of deep cryogenic treatment on surface chemistry and microstructure of selected high-speed steels

2021 ◽  
Vol 548 ◽  
pp. 149257
Author(s):  
Patricia Jovičević-Klug ◽  
Monika Jenko ◽  
Matic Jovičević-Klug ◽  
Barbara Šetina Batič ◽  
Janez Kovač ◽  
...  
Keyword(s):  
Surface Chemistry ◽  
High Speed ◽  
Cryogenic Treatment ◽  
Deep Cryogenic Treatment

Effects of deep cryogenic treatment on machinability, hardness and microstructure in dry turning process of tempered steels

2020 ◽  
pp. 095440892097944
Author(s):  
Menderes Kam
Keyword(s):  
Cryogenic Treatment ◽  
Cutting Tools ◽  
Cutting Speed ◽  
Point Of View ◽  
Turning Process ◽  
Deep Cryogenic Treatment ◽  
Dry Turning ◽  
Control Factors ◽  
Heat Treated ◽  
Hardness Values

This study investigated the effects of Deep Cryogenic Treatment (DCT) on machinability, hardness, and microstructure in dry turning process of AISI 4140 (48-51 HRc) tempered steels with ceramic cutting tools on the surface roughness (Ra). DCT process of steels has shown significant improvement in their mechanical properties. In this context, experiments were made with Taguchi L16 method and optimum values were determined. Three different values for each control factors as: different heat treated samples, cutting speeds (160, 200, 240, 280 m/min), feed rates (0.08, 0.12, 0.16, 0.20 mm/rev) were selected. As a result, the lowest Ra value was found to be 0.159 µm for the DCTT36 sample at a cutting speed of 240 m/min, a feed rate of 0.08 mm/rev. The optimum Ra value was the lowest for the DCTT36 sample compared to the other samples as 0.206 µm. The hardness values of the micro and macro were highest for the DCTT36 sample. Microstructural point of view Scanning Electron Microscopy (SEM) point of view, the DCCT36 sample showed that best results owing to its homogeneity. It was concluded that lower Ra values can be obtained with ceramic cutting tool in dry turning experiments according to the studies in the literature review. It is thought to be preferred as an alternative to cylindrical grinding process due to lower cost.

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