Download or read book The Use of Jominy Test for Studying the Quench sensitivity of Aluminium Alloys written by A. J. BRYANT and published by . This book was released on 1962 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Heat Treating written by Kiyoshi Funatani and published by ASM International. This book was released on 2000-01-01 with total page 1214 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Quench Sensitivity of 6xxx Aluminum Alloys written by Adam Assaad and published by . This book was released on 2016 with total page 83 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of AA6xxx series alloys continues to grow with the increasing demand for more fuel efficient vehicles. AA6xxx series alloys are commonly used in automotive applications because of their extrudability and good strength/weight ratio. As the use of these alloys becomes more prominent, new technologies must be developed to improve them. Chromium has been used as an alloy addition to AA6xxx alloys to control the grain structure by creating dispersoids that pin grains and limit grain growth and thereby improve the mechanical properties of aluminum alloys. However, the addition of chromium and other transition metals can have some adverse effects on aluminum alloys including making them more quench sensitivity after processing. The objective of this research was to do study the effect of alloy composition including the effect of Cr on the quench sensitivity of AA6xxx aluminum alloys, and to measure the effect of quench sensitivity on subsequent mechanical properties both in the T4 (naturally aged) and T6 (artificially aged) temper conditions. The experiments were conducted using a standard Jominy quenched end test and also included tensile testing for various quenching conditions for the AA6xxx alloys studied. The Jominy test provided a large range of cooling rates, which provided data for the variation in hardness as a function of cooling history. Supplemental tests were done on the alloys using tensile samples and water, air and furnace cooling to see what effect these cooling histories had on mechanical properties. It was found that the addition of Cr and Mn to the AA6xxx alloy caused an increase in quench sensitivity, and the cooling rate during quenching had a strong effect on the mechanical properties. It was found that AA6063 can be air cooled or cooled at a rate of ~0.8°C/s (48°C/s) after extrusion to retain 90% of its peak yield strength. Composition 1 (high Cr) must be cooled at a rate of at least ~25°C/s (1500 °C/min) in order to retain 90% of its peak yield strength. Composition 3 (high Cr and Mg) must be cooled at a rate of ~30°C/s in order to retain 90% of its peak yield strength.

Download or read book Heat Treating 1998 Proceedings of the 18th Conference Including the Liu Dai Memorial Symposium written by Harry W. Walton and published by ASM International. This book was released on 1999-01-01 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Journal of the Institute of Metals written by Institute of Metals and published by . This book was released on 1966 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Investigation of the Quench and Heating Rate Sensitivities of Selected 7000 Series Aluminum Alloys written by and published by . This book was released on 2007 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: The quench sensitivity of AA7136 has been experimentally investigated using Jominy end quench and test coupons of various heat treatments. It was found that this alloy is not quench sensitive. In addition, the effects of heating rate on both solution and aging treatments on AA7136 and AA7075 were determined using a newly developed reverse Jominy heating test. It was observed that hardness was reduced after rapid heating during aging and hardness increased slightly after rapid heating during solutionizing. These results are discussed in terms of microstructural developments.

Download or read book Light Metals 2023 written by Stephan Broek and published by Springer Nature. This book was released on 2023-07-20 with total page 1336 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Light Metals symposia at the TMS Annual Meeting & Exhibition present the most recent developments, discoveries, and practices in primary aluminum science and technology. The annual Light Metals volume has become the definitive reference in the field of aluminum production and related light metal technologies. The 2023 collection includes contributions from the following symposia: · 60 Years of Taking Aluminum Smelting Research and Development from New Zealand to the World: An LMD Symposium in Honor of Barry J. Welch · Alumina & Bauxite · Aluminium Industry Emissions Measurement, Reporting & Reduction · Aluminium Waste Management & Utilisation · Aluminum Alloys, Characterization and Processing · Aluminum Reduction Technology · Cast Shop Technology · Electrode Technology for Aluminum Production · Scandium Extraction and Use in Aluminum Alloys

Download or read book The British Foundryman written by and published by . This book was released on 1966 with total page 1166 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Battelle Technical Review written by Battelle Memorial Institute and published by . This book was released on 1966 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Properties and Processing of Materials and Waste Recycling written by Lorenzo Donati and published by Trans Tech Publications Ltd. This book was released on 2024-09-27 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt: Special topic volume with invited peer-reviewed papers only

Download or read book A Study on Quench Sensitivity and Validation of JEQ for Cast Aluminum Alloys A356 and B319 written by Sachin Mehta and published by . This book was released on 2001 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Encyclopedia of Aluminum and Its Alloys Two Volume Set Print written by George E. Totten and published by CRC Press. This book was released on 2018-12-07 with total page 2957 pages. Available in PDF, EPUB and Kindle. Book excerpt: This encyclopedia, written by authoritative experts under the guidance of an international panel of key researchers from academia, national laboratories, and industry, is a comprehensive reference covering all major aspects of metallurgical science and engineering of aluminum and its alloys. Topics covered include extractive metallurgy, powder metallurgy (including processing), physical metallurgy, production engineering, corrosion engineering, thermal processing (processes such as metalworking and welding, heat treatment, rolling, casting, hot and cold forming), surface engineering and structure such as crystallography and metallography.

Download or read book Metallurgical Abstracts written by Institute of Metals and published by . This book was released on 1967 with total page 1172 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Spring International Conference on Material Sciences and Technology written by Alokesh Pramanik and published by Trans Tech Publications Ltd. This book was released on 2022-08-19 with total page 217 pages. Available in PDF, EPUB and Kindle. Book excerpt: Selected peer-reviewed extended papers abstracts of which were presented at the 11th Spring International Conference on Material Sciences and Technology (MST-S 2022) Aggregated Book

Download or read book The jominy end quench test for investigation of corrosion properties and microstructure of high strength aluminium alloys written by W. G. J. 't Hart and published by . This book was released on 1980 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Aluminium Abstracts written by and published by . This book was released on 1967 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Quench Sensitivity of 7xxx Series Aluminium Alloys written by Yong Zhang and published by . This book was released on 2014 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: The quench sensitivity of high strength 7xxx series aluminium alloys becomes an increasingly important issue as the product thickness increases. Due to the nature of thermal conduction, the centre layer of a thick aluminium plate experiences a slower cooling rate than the surface. This can lead to variations in properties such as strength, corrosion resistance and fracture toughness across the thickness of a plate. The objective of this work was to study the quench-induced precipitation behaviour in different 7xxx alloys with systematic changes of alloy composition and processing history. Detailed microstructural analysis has been carried out using SEM, EBSD, TEM and HAADF-HRTEM. Vickers hardness values, electrical conductivities and the precipitation heats determined from differential scanning calorimetry (DSC) were measured for a wide range of different cooling rate conditions to evaluate the different quench sensitivity behaviours. The main findings from this work are as follows:1.The results show that the Al3Zr dispersoids in recrystallised grains can become preferential nucleation sites for quench-induced precipitates in air cooling condition. The microstructural characterisation shows that the Al3Zr dispersoids tend to maintain their metastable structure and orientation when recrystallisation occurs. This causes them to lose coherency with the matrix after recrystallisation and thereby causes them to become more potent heterogeneous nucleation sites for quench-induced precipitation. It should be noted that incoherent Al3Zr dispersoids are not the only preferential sites for quench-induced precipitates. They can precipitate out at grain/subgrain boundaries in air cooling condition. However, the current research still demonstrates that materials containing a higher fraction of recrystallisation will lead to a significant increase of quench sensitivity.2.The precipitation heats for quench-induced precipitates have been studied using a specialised DSC technique over a wide range of cooling rate conditions. A continuous cooling precipitation (CCP) diagram for commercially produced alloy 7150 has been developed based on a combination of DSC measurements, microstructure analysis and hardness testing. The results show that there are three main quench-induced precipitation located in different temperature ranges. It is demonstrated that the high temperature reaction from about 350 to 470 °C corresponds to S-phase (Al2CuMg), the medium temperature reaction from about 200 to 400 °C corresponds to M-phase (MgZn2) and the low temperature reaction from about 250 to 150 °C corresponds to a unique platelet phase containing both Cu and Zn. The critical cooling rates were determined to be 3 K/s for the S-phase, 10 K/s for the M-phase, and 300 K/s for the unique platelet phase in alloy 7150.The platelet phase has not been previously reported for alloy 7150. The platelets precipitate with a high aspect ratio and have a hexagonal structure (a=0.429 nm, c=1.385 nm) according to HAADF-STEM images. It is shown that this platelet phase can contribute to strengthening. 3.It was shown that the surface layer of a 7150 thick plate is more sensitive to cooling rate than the centre layer. This can be ascribed to a relatively higher degree of recrystallisation in the surface layer. Therefore there are more nucleation sites for quench-induced precipitates in the same cooling condition. It was confirmed with DSC analysis that the precipitation heat values for the surface layer are higher than for the centre layer, demonstrating that there is more quench-induced precipitation occuring in the surface layer.4.A number of CCP diagrams were developed for alloys 7085, 7037, 7020 and 7055 with systematic changes in alloy composition. It is demonstrated that the quench sensitivity generally increases with increasing total alloy content. Therefore alloy 7020 exhibits the lowest quench sensitivity when compared with the other studied alloys. It is noted that the amount of M-phase increases with increasing Zn content. Therefore alloys 7085, 7037 and 7055 can precipitate more M-phase during slow cooling than alloys 7150 and 7020. However, the precipitation of S-phase during continuous cooling was found to be significantly suppressed with increasing Zn/Mg ratio. Quench factor analysis (QFA) also indicates that higher k3 values can be found for the higher Zn/Mg ratio alloys 7085 and 7037, suggesting that the energy required to form a nucleus is higher in these two alloys. This is in agreement with experimental observations that these two alloys contained less S-phase and exhibited relatively low quench sensitivities.It was shown that the CCP diagrams provide a useful method of quantifying the quench sensitivities of different alloys. The CCP diagrams can also facilitate engineers to design and optimise industrial cooling process more effectively. However, it requires a deep understating of the quench-induced precipitation to develop a reliable CCP diagram for a given alloy, i.e. what types of quench-induced precipitation reactions happen, where they preferentially nucleate and how many much precipitation occurs during the cooling process. The current research therefore shows that the quench sensitivity of a 7xxx alloy can be decreased by decreasing the degree of deformation, decreasing the fraction of recrystallisition, decreasing the total grain boundary area, decreasing the number of incoherent dispersoids, decreasing the total alloying content, increasing the Zn/Mg ratio and decreasing the Cu content.