Internal Friction Study of the Influence of Deep Cryogenic Treatment on the Microstructure of a Bainitic Steel

2012 ◽  
Vol 184 ◽  
pp. 239-244
Author(s):  
Na Min ◽  
Tian Yu Ji ◽  
Li Juan Zhu ◽  
Xiao Chun Wu ◽  
Hong Bin Wang
Keyword(s):  
Internal Friction ◽  
Cryogenic Temperature ◽  
Cryogenic Treatment ◽  
Cryogenic Cooling ◽  
Bainitic Steel ◽  
Deep Cryogenic Treatment ◽  
Soaking Time ◽  
Transmission Electron ◽  
Dislocation Pinning ◽  
Friction Study

The influence of deep cryogenic treatment (DCT) on the microstructure of a bainitic steel is investigated by means of internal friction and transmission electron microscopy (TEM). Two relaxation peaks (Pc1and Pc2) are observed during cooling and one relaxation peak (Ph) during heating from 100 to 320K. Peak Pc1may be related to dislocation pinning. Peak Phis attributed to dislocation-carbon atoms interaction. The decreasing of peak Phafter cycles deep cryogenic cooling indicates that soaking time under the deep cryogenic temperature is not contributed to the precipitation of carbides, while the cycles cryogenic treatment lead to more fine carbides precipitation.

XRD, STEM, and Tensile Properties of AISI S1 Tool Steel after Deep Cryogenic Treatment

2015 ◽  
Vol 1088 ◽  
pp. 195-199
Author(s):  
Seyed Ebrahim Vahdat ◽  
Keyvan Seyedi Niaki
Keyword(s):  
Tensile Properties ◽  
Tool Steel ◽  
Cryogenic Treatment ◽  
X Ray Diffraction ◽  
Deep Cryogenic Treatment ◽  
Soaking Time ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Successful Employment ◽  
Advanced Tool

Successful employment of advanced tool steel in engineering applications is related to its ability in terms of meeting service life requirements and fabrication with proper dimensions. Deep cryogenic treatment may be used to produce advanced tool steel by simultaneously increasing toughness, strength, and hardness. Twelve sets of specimens were tested in this paper, 9 of which were deep cryogenic treated and then tempered. Tensile properties, hardness, X-ray diffraction, and scanning transmission electron microscopy were applied for macroscopic and microscopic investigations. The best results of simultaneous improvement in toughness, hardness, and strength were obtained for 36 h soaking time and 1 h tempering time.

scholarly journals Effect of Cryogenic Treatment on Microstructure and Wear Resistance of Carburized 20CrNi2MoV Steel

Metals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 808 ◽  
Author(s):  
Binzhou Li ◽  
Changsheng Li ◽  
Yu Wang ◽  
Xin Jin
Keyword(s):  
Electron Microscopy ◽  
Wear Resistance ◽  
Sliding Wear ◽  
Cryogenic Treatment ◽  
Wear Test ◽  
Deep Cryogenic Treatment ◽  
Transmission Electron ◽  
Conventional Heat Treatment ◽  
Carburizing Process ◽  
Ball On Disc

This paper investigated the response of carburized 20CrNi2MoV steel to cryogenic treatment including microstructure and wear resistance. Two cryogenic treatment methods including cryogenic treatment at −80 °C (CT) and deep cryogenic treatment at −196 °C (DCT) as well as conventional heat treatment (CHT) were carried out after carburizing process. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffractometry (XRD) were employed for microstructure characterization. The wear resistance was investigated by ball-on-disc sliding wear test on a multi-functional tribometer. The results show that the wear resistance of the experimental steel has been improved by 17% due to CT and by 25.5% due to DCT when compared to CHT. This significant improvement in wear resistance after cryogenic treatment is attributed to the microstructural changes including the finer martensitic structure, the reduction of retained austenite and the development of fine and more numerous carbides. Among these factors, the precipitation of fine carbides plays a more prominent role in enhancing wear resistance.

Fatigue Focused Optimization of Treatment Parameters – A Case Study about Deep Cryogenic Treatment

2011 ◽  
Vol 488-489 ◽  
pp. 498-501
Author(s):  
Paolo Baldissera ◽  
Cristiana Delprete
Keyword(s):  
Cryogenic Treatment ◽  
Likelihood Estimation ◽  
Deep Cryogenic Treatment ◽  
Soaking Time ◽  
Surface Method ◽  
Treatment Parameter ◽  
Standard Response ◽  
Proper Scaling ◽  
Two Parameters

The problem of treatment parameter optimization focused on the fatigue resistance is analysed through a case study about Deep Cryogenic Treatment (DCT) of AISI 302 steel. In particular, the possibility to integrate fatigue data fittings through the Maximum Likelihood Estimation (MLE) method in the optimization process is evaluated. Two levels of two parameters (soaking time and temperature) are considered and then expanded to three by proper scaling of their values in order to include the untreated case as a “zero” level. Fatigue focused optimization is then achieved by standard Response Surface Method (RSM) and by MLE with two models for comparison purposes.

Influence of deep cryogenic treatment on internal friction behavior in the process of tempering

2011 ◽  
Vol 528 (3) ◽  
pp. 1247-1250 ◽  
Author(s):  
Shaohong Li ◽  
Na Min ◽  
Lihui Deng ◽  
Xiaochun Wu ◽  
Yong’an Min ◽  
...  
Keyword(s):  
Internal Friction ◽  
Cryogenic Treatment ◽  
Friction Behavior ◽  
Deep Cryogenic Treatment

Study of Deep Cryogenic Treatment Process Effect on Microstructure and Properties of CuBeZr Alloy

2020 ◽  
Vol 841 ◽  
pp. 335-339
Author(s):  
Nuwan Wannaprawat ◽  
Karuna Tuchinda
Keyword(s):  
Treatment Process ◽  
Cryogenic Treatment ◽  
Microstructure Analysis ◽  
Surface Wear ◽  
Deep Cryogenic Treatment ◽  
Maximum Increase ◽  
Soaking Time ◽  
Materials Properties ◽  
Alloy Microstructure ◽  
Sem Microstructure

The aim of this research was study the influence of the Deep Cryogenic Treatment (DCT) on the microstructure transformation and materials properties of beryllium copper alloy (CuBeZr alloy). Microstructure analysis such as size, shape and number of precipitates were studied by Optical microscopy (OM) and Scanning Electron Microscopy (SEM). Microstructure analysis showed that transformation into the rod shape precipitates appeared after the process. The dispersion of CuNi precipitates and CuNiZr precipitates in the ⍺ matrix after deep cryogenic treatment was found to be increased. The change in number of CuNi precipitates and CuNiZr precipitates led to an increase in hardness and wear resistance. The maximum increase in hardness of 11% was observed with 48 hours soaking time with a reduction in surface wear of approx. 60%.

Influence of deep cryogenic treatment on microstructure and evaluation by internal friction of a tool steel

Cryogenics ◽  
2010 ◽  
Vol 50 (11-12) ◽  
pp. 754-758 ◽  
Author(s):  
Shaohong Li ◽  
Lihui Deng ◽  
Xiaochun Wu ◽  
Yong’an Min ◽  
Hongbin Wang
Keyword(s):  
Internal Friction ◽  
Tool Steel ◽  
Cryogenic Treatment ◽  
Deep Cryogenic Treatment

scholarly journals The Effect of Heat and Cryogenic Treatment on Wear Properties of 6061 Alloy

2020 ◽  
Vol 9 (6) ◽  
pp. 562-566
Keyword(s):  
Wear Resistance ◽  
Aluminium Alloys ◽  
Cryogenic Temperature ◽  
Cryogenic Treatment ◽  
Wear Test ◽  
Wear Properties ◽  
Electron Microscopic ◽  
Deep Cryogenic Treatment ◽  
Scanning Electron Microscopic ◽  
Microscopic Features

The published information on ferrous and nonferrous metals especially Aluminium alloys subjected to deep cryogenic treatment (DCT) have yielded much improved mechanical, tribological and thermal properties resulting in improved properties in the field. Keeping the above aspects in view, tribological studies have been taken up in this work with the main objective of evaluating the wear resistance of the most used Aluminium alloys viz: Al 6061 samples at cryogenic temperature and subjected them to deep cryogenic treatment for temperature . The novelty of the work lies in conducting the wear test in cryogenic atmosphere which is the first of its kind as meagre report is available. It is observed from the wear data that the slide wear resistance and coefficient of friction evaluated in the laboratory conditions show superior wear resistance for the load application of 40N and 50N and lower friction levels for the samples subjected to sliding at cryogenic temperature as well as for the samples deeply cryo treated compared to the untreated ones. The data have been substantiated by Scanning Electron Microscopic features (SEM).

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