PROBLEMS OF GETTING CHARACTERISTICS OUT OF QUENCHING EXPERIMENTS USEFUL TO CONTROL THE HEAT TREATMENT OF METALLIC MATERIALS

1986 ◽  
Author(s):  
Hans Maria Tensi ◽  
G. Welzel ◽  
Th. Kunzel
Keyword(s):  
Heat Treatment ◽  
Metallic Materials

scholarly journals Deep Cryogenic Treatment of Metallic Materials

2020 ◽  
Author(s):  
Patricia Jovičević-Klug ◽  
Bojan Podgornik
Keyword(s):  
Crystal Structure ◽  
Heat Treatment ◽  
Corrosion Resistance ◽  
Cryogenic Treatment ◽  
Metallic Materials ◽  
Size Change ◽  
Ferrous Alloys ◽  
Deep Cryogenic Treatment ◽  
Ferrous Metals ◽  
Proper Material

Deep cryogenic treatment (DCT) is a type of cryogenic treatment, where a metallic material is subjected to temperatures below -150°C, normally to temperatures of liquid nitrogen (-196 °C). When a material is exposed to DCT as a part of heat treatment, changes in microstructure are induced due to new grain formation, changes in grain size, change in the solubility of atoms, movement of dislocations, alteration of crystal structure, and finally new phase formation. The metallic material's performance and later performance of manufactured components and tools from this specific material are dependent on the selection of proper design, proper material, accuracy with which the tool is made and application of proper heat treatment, including any eventual DCT. Metallic materials are ferrous and non-ferrous metals. In the last years ferrous metals (different grades of steel) and non-ferrous alloys (aluminum, magnesium, titanium, nickel etc.) have been increasingly treated with DCT to alter their properties. DCT treatment has shown to reduce density of defects in crystal structure, increase wear resistance of material, increase hardness, improve toughness, and reduce tensile strength and corrosion resistance. However, some researchers also reported results showing no change in properties (toughness, hardness, corrosion resistance, etc.) or even deterioration when subjected to DCT treatment. This leads to a lack of consistency and reliability of the treatment process, which is needed for successful application in industry. This review provides a synopsis of DCT usage and resulting effects on treated materials used in automotive industry.

Development of an Optimal Heat Treatment Regime for a Gradient Material Containing Tungsten Carbide

2017 ◽  
Vol 909 ◽  
pp. 219-224
Author(s):  
Ilia V. Chumanov ◽  
A.N. Anikeev
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Treatment Effect ◽  
Metal Structure ◽  
Gradient Material ◽  
Metallic Materials ◽  
Treatment Development ◽  
Optimal Heat Treatment ◽  
Heat Treatment Regime ◽  
Metal Products

One of the main processes in metal products is heat treatment. However, existing regimes of heat treatment are not suitable for the new gradient metals. This article presents a method of obtaining gradient metallic materials and heat treatment development. Also presents the studies results of heat treatment effect on mechanical properties and metal structure.

Healing of Fatigue Crack in Metallic Materials by Heat Treatment and Evaluation of Fatigue Crack Propagation

2016 ◽  
Vol 2016 (0) ◽  
pp. J0460101
Author(s):  
Yuto FURUYA ◽  
Takashi OKAMURA ◽  
Shoma TAKEDA ◽  
Atsushi HOSOI ◽  
Sehiro KIMURA ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Metallic Materials

Curing damage in metallic materials by means of regenerative heat treatment

1995 ◽  
Vol 37 (4) ◽  
pp. 136-140 ◽  
Author(s):  
V. I. Kumanin ◽  
L. A. Kovaleva ◽  
M. L. Sokolova
Keyword(s):  
Heat Treatment ◽  
Metallic Materials ◽  
Regenerative Heat

scholarly journals Forming and Heat Treatment of Modern Metallic Materials

Metals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1106
Author(s):  
Ján Moravec ◽  
Karel Gryc
Keyword(s):  
Heat Treatment ◽  
Material Processing ◽  
Production Line ◽  
Metallic Materials ◽  
Metallic Material

Forming and heat treatment of metals are crucial technologies for final metallic material processing at the end of production line, before they are incorporated into the final products or crucial components of more and more demanding systems required for the sustainability and development and of our civilization [...]

scholarly journals Innovative Densification Process of a Fe-Cr-C Powder Metallurgy Steel

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 665
Author(s):  
Federico Simone Gobber ◽  
Jana Bidulská ◽  
Alessandro Fais ◽  
Róbert Bidulský ◽  
Marco Actis Grande
Keyword(s):  
Heat Treatment ◽  
Powder Metallurgy ◽  
Process Parameters ◽  
Rupture Strength ◽  
Mechanical Resistance ◽  
Metallic Materials ◽  
Transverse Rupture Strength ◽  
Sinter Forging ◽  
Metallurgy Steel ◽  
Main Factor

In this study, the efficacy of an innovative ultra-fast sintering technique called electro-sinter-forging (ESF) was evaluated in the densification of Fe-Cr-C steel. Although ESF proved to be effective in densifying several different metallic materials and composites, it has not yet been applied to powder metallurgy Fe-Cr-C steels. Pre-alloyed Astaloy CrM powders have been ad-mixed with either graphite or graphene and then processed by ESF. By properly tuning the process parameters, final densities higher than 99% were obtained. Mechanical properties such as hardness and transverse rupture strength (TRS) were tested on samples produced by employing different process parameters and then submitted to different post-treatments (machining, heat treatment). A final transverse rupture strength up to 1340 ± 147 MPa was achieved after heat treatment, corresponding to a hardness of 852 ± 41 HV. The experimental characterization highlighted that porosity is the main factor affecting the samples’ mechanical resistance, correlating linearly with the transverse rupture strength. Conversely, it is not possible to establish a similar interdependency between hardness and mechanical resistance, since porosity has a higher effect on the final properties.

scholarly journals Extra plasticity governed by shear band deflection in gradient metallic glasses

2021 ◽  
Author(s):  
Yao Tang ◽  
Haofei Zhou ◽  
Xiaodong Wang ◽  
Qingping Cao ◽  
Dongxian Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Metallic Glasses ◽  
Atomistic Simulations ◽  
Spatial Gradient ◽  
Metallic Materials ◽  
Bulk Materials ◽  
Gradient Materials ◽  
Ultrahigh Strength ◽  
Significant Research

Abstract Inspired by gradient materials in nature, advanced engineering components with controlled structural gradients have attracted significant research interest due to their exceptional combinations of properties. However, it remains challenging to generate structural gradients that penetrate through bulk materials, which is essential for achieving enhanced mechanical properties in metallic materials. Here, we propose a heat treatment engineering protocol to realize a controllable structural gradient in bulk metallic glasses (BMGs). By adjusting the holding time of cryogenic thermal cycling, a series of BMGs with gradient-distributed free volume contents from internal to external can be synthesized. Both mechanical testing and atomistic simulations demonstrate that the spatial gradient can endow BMGs with extra plasticity without sacrificing their ultrahigh strength. Such an enhanced mechanical property is governed by the gradient-induced deflection of shear deformation that fundamentally suppresses the unlimited shear localization on a straight plane that would be expected in BMGs without such a gradient.

Microwave Annealing of Cold Compression Deformation Red Copper

2011 ◽  
Vol 199-200 ◽  
pp. 1840-1844
Author(s):  
Wen He ◽  
Yun Long Ai ◽  
Jia Yuan Ding ◽  
Li Liu ◽  
Fei He
Keyword(s):  
Heat Treatment ◽  
Microwave Heating ◽  
Arc Discharge ◽  
Annealing Treatment ◽  
Annealing Condition ◽  
Metallic Materials ◽  
Cold Compression ◽  
Microwave Annealing ◽  
Compression Deformation ◽  
Heating Technology

Annealing treatment of cold compression deformation red copper was heated by microwave. The feasibility of microwave heating technology applied to heat treatment of metallic materials, and the effect of annealing process on microstructure were discussed. The results show that the phenomenon of arc discharge do not occur during the process of microwave heating red copper, which illustrates that microwave can be used as heat source for heat treatment of metallic materials. When annealing condition is 510°C for 30min, the grains of deformation red copper undergo a transition from fibrous grain to equiaxial grain, and it completes recrystallization. Compared with traditional annealing treatment, microwave annealing treatment can prevent oxidation phenomenon of specimen surface effectively, reduce annealing temperature, shorten heating and holding time, reduce the consumption of energy greatly, and the degree of hardness decline is smaller under the same annealing condition.

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