scholarly journals Effects of Deep Cryogenic Treatment on the Microstructure and Properties of Rolled Cu Foil

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5498
Author(s):  
Zhichao Dong ◽  
Xiangyu Fei ◽  
Benkui Gong ◽  
Xinyu Zhao ◽  
Jiwei Nie
Keyword(s):  
Mechanical Properties ◽  
Dislocation Density ◽  
High Speed ◽  
Treatment Time ◽  
Cryogenic Treatment ◽  
Wearable Electronics ◽  
Deep Cryogenic Treatment ◽  
Cu Foil ◽  
The Impact ◽  
Peak Value

The development of fifth-generation (5G) communication and wearable electronics generates higher requirements for the mechanical properties of copper foil. Higher mechanical properties and lower resistance are required for flexible copper-clad laminate and high-frequency and high-speed Cu foil. Deep cryogenic treatment (DCT), as a post-treatment method, has many advantages, such as low cost and ease of operation. However, less attention has been paid to the impact of DCT on rolled Cu foil. In this study, the effects of DCT on the microstructure and mechanical properties of rolled Cu foil were investigated. The results show that as the treatment time increased, the tensile strength and hardness first increased and then decreased, reaching a peak value of 394.06 MPa and 1.47 GPa at 12 h. The mechanical property improvement of rolled Cu foil was due to the grain refinement and the increase of dislocation density. The dislocation density of rolled Cu foil after a DCT time of 12 h was determined to have a peak value of 4.3798 × 1015 m−2. The dislocation density increased by 19% and the grain size decreased by 12% after 12 h DCT.

scholarly journals Effect of Cryogenic Treatment on Mechanical Properties of AISI 4340 and AISI 4140 Steel

2019 ◽  
Vol 38 (3) ◽  
pp. 755-766
Author(s):  
Abdul Rauf Rauf Jamali ◽  
Waseem Khan ◽  
Ali Dad Chandio ◽  
Zubai Anwer ◽  
Muhammad Hayat Jokhio
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Cryogenic Treatment ◽  
Cost Effective ◽  
Micro Structure ◽  
Deep Cryogenic Treatment ◽  
Heat Treated ◽  
Aisi 4140 ◽  
The Impact ◽  
Aisi 4340

From last epoch till to date, AISI 4340 and AISI 4140 have been widely used in different engineering applications. These applications include bolt, screws, gears, drive shafts, crane shaft and piston rods for engines due to its upright mechanical properties, cost-effective and easily available in market. In present work, deep cryogenic treatment effect on the mechanical properties of AISI 4340 and AISI 4140 have been studied. Present work was carried out at laboratory scale and can be extended for mass production. Our work is simple, straight forward safe and economical. In our work, samples were heat treated in simple muffle furnace and followed by cryogenic treatment in liquid nitrogen. Before cryogenic treatment, all samples were normalized at 860°C to obtain homogenized micro structure. Samples were also compared conventionally heat treatment with quenched in oil quenchant. Experimental results showed that after cryogenic treatment with tempering treatment, one could easily increase the tensile strength, impact toughness and hardness. Advanced optical microscopy (IMM 901) and SEM (Scanning Electron Microscopy), FIT Quanta 200 methods have also been deployed to reveal and interpret the internal structure of samples. It was found from micro structure that cryogenic treated sample increases the impact strength, hardness and tensile strength as compared conventional heat treated quenching approaches.

Effect of Chemical Composition and Heat Treatment Parameters on the Structure and Properties of Vanadis 23 and Vanadis 30 PM High-Speed Steels

2017 ◽  
Vol 270 ◽  
pp. 258-264
Author(s):  
Jana Sobotová ◽  
Martin Kuřík ◽  
Jakub Lacza
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
High Speed ◽  
Cryogenic Treatment ◽  
Energy Dispersive Spectrometer ◽  
Metallographic Analysis ◽  
Deep Cryogenic Treatment ◽  
Three Point Bending ◽  
Conventional Heat Treatment ◽  
Multiple Tempering

The paper deals with the assessment of the effect of content of cobalt and cryogenic treatment on mechanical properties and structure of Vanadis 23 and Vanadis 30 PM high-speed steels. The studied characteristics are evaluated after conventional heat treatment (quenching and multiple tempering) and also when deep cryogenic treatment at -196°C/4 hours was inserted between quenching and tempering. The mechanical properties are assessed by a three-point bending flexural test and by measurement of the hardness. Metallographic analysis is performed using an energy dispersive spectrometer (EDS) and the scanning electron microscope (SEM).

scholarly journals SIMULTANEOUSLY ENHANCING MECHANICAL PROPERTIES AND ELECTRICAL CONDUCTIVITY OF CU-CR ALLOY PROCESSED BY ECAP AND DCT

2020 ◽  
Vol 26 (4) ◽  
pp. 161-165
Author(s):  
Zhu Qi Chu ◽  
Kun Wei ◽  
Li Yang ◽  
Qing Du ◽  
Wei Wei ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Tensile Strength ◽  
Dislocation Density ◽  
Vacancy Concentration ◽  
Cryogenic Treatment ◽  
Shear Direction ◽  
Deep Cryogenic Treatment ◽  
Angular Pressing ◽  
Elongation To Failure

Mechanical properties and electrical conductivity of Cu-0.5%Cr alloy were simultaneously enhanced by combing the equal channel angular pressing (ECAP) and deep cryogenic treatment (DCT). The effect of DCT on the microstructure and properties of Cu-0.5%Cr alloy prepared by ECAP was investigated. The results show that the grains were elongated and refined along the deformation shear direction, and the dislocation density increased significantly by ECAP deformation. After the subsequent DCT, the grains were further refined, and at the same time, the dislocation density was further increased. With the increase of passes of ECAP, the microhardness and tensile strength of Cu-0.5%Cr alloy increased significantly, but the elongation to failure and electrical conductivity decreased slightly. After the DCT, the microhardness, electrical conductivity, tensile strength and elongation to failure of the Cu-0.5%Cr alloy were improved. After the ECAP (four passes) and DCT (12 h), the tensile strength, elongation to failure and electrical conductivity reached 483 MPa, 17.6% and 29%IACS respectively. The improvement of tensile properties could be attributed to the increase of dislocation density and grain refinement. The electrical conductivity was improved by the DCT due to the decrease of vacancy concentration.

Studying Status and Application Prospect of Cryogenic Treatment on HSS

2013 ◽  
Vol 706-708 ◽  
pp. 304-309 ◽  
Author(s):  
Fang Wei Jin ◽  
Zhi Ming Zhou ◽  
Li Mei Qiu ◽  
Jian Wei ◽  
Long Wu
Keyword(s):  
Mechanical Properties ◽  
Efficient Method ◽  
High Speed ◽  
Development Process ◽  
New Technology ◽  
Cryogenic Treatment ◽  
High Speed Steel ◽  
Working Life ◽  
Treatment Technology ◽  
Deep Cryogenic Treatment

Deep Cryogenic treatment is a new technology that was dated from the later middle of 20th century and gained widely utilization. It has been proven to be a efficient method for improving the mechanical properties and working life of the high speed steel (HSS) substantially by deep cryogenic treatment. This paper summarizes the cryogenic treatment and its mechanism on metal material. Moreover, the development process of deep cryogenic treatment on HSS and its current research at home and abroad were mainly introduced. Finally, some views and prospects of the industrialization of cryogenic treatment technology were putted forward.

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

The Effect of Aging Heat Treatment on the Microstructure and Mechanical Properties of 10Cr20Ni25Mo1.5NbN Austenitic Steel

2016 ◽  
Vol 35 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Zhiyuan Liang ◽  
Wanhua Sha ◽  
Qinxin Zhao ◽  
Chongbin Wang ◽  
Jianyong Wang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Heat Treatment ◽  
Austenitic Steel ◽  
Treatment Time ◽  
Aging Treatment ◽  
Secondary Phases ◽  
Aging Heat Treatment ◽  
Microstructure And Mechanical Properties ◽  
The Impact

AbstractThe effect of aging heat treatment on the microstructure and mechanical properties of 10Cr20Ni25Mo1.5NbN austenitic steel was investigated in this article. The microstructure was characterized by scanning electron microscopy, energy dispersive spectrometry and transmission electron microscopy. Results show that the microstructure of 10Cr20Ni25Mo1.5NbN austenitic is composed of austenite. This steel was strengthened by precipitates of secondary phases that were mainly M23C6 carbides and NbCrN nitrides. As aging treatment time increased, the tensile strength first rose (0–3,000 h) and then fell (3,000–5,000 h) due to the decrease of high density of dislocations. The impact absorbed energy decreased sharply, causing the sulfides to precipitate at the grain boundary. Therefore, the content of sulfur should be strictly controlled in the steelmaking process.

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