scholarly journals AA7050 Al Alloy Hot-Forging Process for Improved Fracture Toughness Properties

Metals ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 64 ◽  
Author(s):  
Giuliano Angella ◽  
Andrea Di Schino ◽  
Riccardo Donnini ◽  
Maria Richetta ◽  
Claudio Testani ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Hot Forging ◽  
Al Alloy ◽  
Warm Working ◽  
Treatment Standard ◽  
Innovative Method ◽  
Conventional Heat Treatment ◽  
Property Loss ◽  
Hot Forging Process ◽  
Unconventional Method

The conventional heat-treatment standard for the industrial post hot-forging cycle of AA7050 is regulated by the AMS4333 and AMS2770N standards. An innovative method that aimed to improve toughness behavior in Al alloys has been developed and reported. The unconventional method introduces an intermediate warm working step between the solution treating and the final ageing treatment for the high resistance aluminum alloy AA7050. The results showed several benefits starting from the grain refinement to a more stable fracture toughness KIC behavior (with an appreciable higher value) without tensile property loss. A microstructural and precipitation state characterization provided elements for the initial understanding of these improvements in the macro-properties.

scholarly journals The use of electromagnetic field in designing the high quality Al alloys for hot forging process

2014 ◽  
Vol 20 (4) ◽  
pp. 247-254
Author(s):  
Zvonko Gulišija ◽  
Aleksandra Patarić ◽  
Marija Mihailović
Keyword(s):  
Electromagnetic Field ◽  
Hot Forging ◽  
High Strength ◽  
Casting Process ◽  
Al Alloy ◽  
Forging Process ◽  
Fine Grained ◽  
Complex Dimensions ◽  
Strength Alloy ◽  
Hot Forging Process

This work presents a way to obtain the better quality of EN AW 7075 aluminum high-strength alloy by application of electromagnetic field (EMF) during the casting process. In this way, the uniform fine-grained microstructure, and hence the better mechanical properties of the alloy can be achieved. The microstructure and mechanical characterization for samples obtained with and without EMF were performed. The application of numerical simulation for hot forging process, using appropriate software, is efficient and highly useful tool for problem prediction in industrial production, reducing the time and costs in the process of development of new products. The input data of high strength Al-alloy EN AW-7075 is used for simulation because it enables the development of parts with complex dimensions and shape. 

Study of the applicability of 22MnB5 sheet metal as protective masks to improve tool life in hot forging process

2020 ◽  
Vol 107 (1-2) ◽  
pp. 39-47
Author(s):  
Luana De Lucca de Costa ◽  
Alberto Moreira Guerreiro Brito ◽  
André Rosiak ◽  
Lirio Schaeffer
Keyword(s):  
Sheet Metal ◽  
Tool Life ◽  
Hot Forging ◽  
Forging Process ◽  
Hot Forging Process

scholarly journals Influence of Anvil Shape of Surface Crack Generation in Large Hot Forging Process

2014 ◽  
Vol 81 ◽  
pp. 480-485 ◽  
Author(s):  
Takefumi Arikawa ◽  
Daisuke Yamabe ◽  
Hideki Kakimoto
Keyword(s):  
Surface Crack ◽  
Hot Forging ◽  
Forging Process ◽  
Crack Generation ◽  
Hot Forging Process

Mechanical Analysis of Low and High Chromium Steels Used in Hot Strip Work Rolls

2018 ◽  
Vol 279 ◽  
pp. 3-9
Author(s):  
Fethi Benkhenafou ◽  
Ines Fernández Pariente ◽  
F.Javier Belzunce ◽  
Abdelkader Ziadi ◽  
Ming Quan Shi ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
High Speed ◽  
Volume Fraction ◽  
Research Work ◽  
High Speed Steel ◽  
Nodular Cast Iron ◽  
High Chromium ◽  
Eutectic Carbides ◽  
Hot Strip ◽  
Conventional Heat Treatment

Microstructure, hardness and fracture toughness of low and high chromium high speed steel used in hot strip mills and subjected to conventional heat treatment have been examined. The influence of tempering temperatures on the mechanical properties of these products, determined using tensile and fracture toughness tests, was studied in this research work. The developed microstructures have been characterized by XRD, optical microscopy and SEM examinations. Macrohardness and microhardness of the specimens have been evaluated by Vickers indentation technique. The fracture toughness of these products was investigated using the rupture weight on 3 points bending specimens. The plane strain fracture toughness KIc and the fracture strength were measured for each alloy. The shell is high harness high speed steels, and the core is nodular cast iron. It was found that most fracture occurred in the eutectic carbides formed by the high content alloy element, such as Mo,V,Cr, but that for the alloys with a reduced volume fraction of eutectic carbides, a small amount of crack propagation occurred in the austenitic dendrites.

scholarly journals Physical and Numerical Simulations of Closed Die Hot Forging and Heat Treatment of Forged Parts

Materials ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 15
Author(s):  
Łukasz Poloczek ◽  
Łukasz Rauch ◽  
Marek Wilkus ◽  
Daniel Bachniak ◽  
Władysław Zalecki ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Grain Size ◽  
Numerical Simulations ◽  
Phase Transformations ◽  
Hot Forging ◽  
Transformation Model ◽  
Controlled Cooling ◽  
Austenite Grain Size ◽  
Austenite Grain ◽  
Conventional Heat Treatment

The paper describes physical and numerical simulations of a manufacturing process composed of hot forging and controlled cooling, which replace the conventional heat treatment technology. The objective was to investigate possibilities and limitations of the heat treatment with the use of the heat of forging. Three steels used to manufacture automotive parts were investigated. Experiments were composed of two sets of tests. The first were isothermal (TTT) and constant cooling rate (CCT) dilatometric tests, which supplied data for the identification of the numerical phase transformation model. The second was a physical simulation of the sequence forging-cooling on Gleeble 3800, which supplied data for the validation of the models. In the numerical part, a finite element (FE) thermal-mechanical code was combined with metallurgical models describing recrystallization and grain growth during forging and phase transformations during cooling. The FE model predicted distributions of the temperature and the austenite grain size in the forging, which were input data for further simulations of phase transformations during cooling. A modified JMAK equation was used to calculate the kinetics of transformation and volume fraction of microstructural constituents after cooling. Since the dilatometric tests were performed for various austenitization temperatures before cooling, it was possible to include austenite grain size as a variable in the model. An inverse algorithm developed by the authors was applied in the identification procedure. The model with optimal material parameters was used for simulations of hot forging and controlled cooling in one of the forging shops in Poland. Distributions of microstructural constituents in the forging after cooling were calculated. As a consequence, various cooling sequences during heat treatment could be analyzed and compared.

A Closed Concept to Associate the Hot-Forging Process Controlled Microstructure with Fatigue Life

2012 ◽  
pp. 625-631
Author(s):  
Michael Stoschka ◽  
Martin Stockinger ◽  
Hermann Maderbacher ◽  
Martin Riedler
Keyword(s):  
Fatigue Life ◽  
Hot Forging ◽  
Forging Process ◽  
Hot Forging Process
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