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Author: Publisher: ISBN: Category : Languages : en Pages : 41
Book Description
The purpose of this program is to evaluate large titanium forgings for reliable use in advanced weapon systems. Four forgings of Ti-6Al-4V and four forgings of IMI679 will be used in the evaluation. Two forgings of each alloy will be machined into test coupons for material property tests, one forging will be full scale fatigue tested and the other forging will be full scale static tested. All forgings have been produced and heat treated. Machining of two forgings each of Ti-6Al-4V and IMI679 to a modified F-104 aft fuselage ring fitting is nearly completed. Preparation of material property test coupons removed from the forgings of IMI679 was started and some testing completed. Preliminary smooth tension, notched tension, compression and fatigue data on IMI679 are presented. (Author).
Author: Publisher: ISBN: Category : Languages : en Pages : 41
Book Description
The purpose of this program is to evaluate large titanium forgings for reliable use in advanced weapon systems. Four forgings of Ti-6Al-4V and four forgings of IMI679 will be used in the evaluation. Two forgings of each alloy will be machined into test coupons for material property tests, one forging will be full scale fatigue tested and the other forging will be full scale static tested. All forgings have been produced and heat treated. Machining of two forgings each of Ti-6Al-4V and IMI679 to a modified F-104 aft fuselage ring fitting is nearly completed. Preparation of material property test coupons removed from the forgings of IMI679 was started and some testing completed. Preliminary smooth tension, notched tension, compression and fatigue data on IMI679 are presented. (Author).
Author: R. F. Simenz Publisher: ISBN: Category : Alloys Languages : en Pages : 171
Book Description
This report describes the evaluation of large, closed-die forgings of two titanium alloys. Four forgings each of Ti-6Al-4V and IMI 679 were used in the evaluation. Property tests that were conducted included tension, notched tension, compression. Tuckerman modulus, shear, bearing, fracture toughness and smooth and notched axial fatigue. Thermal exposure and susceptibility to delayed failure in salt water were also evaluated in each alloy. Static properties were generally slightly better in the Ti-6Al-4V alloy. However, the IMI 679 provided significantly better smooth and notched fatigue values. Both alloys had good fracture toughness at room temperature and at -110 deg F. Static and fatigue tests were conducted on one forging each of Ti-6Al-4V and IMI 679. The Ti-6Al-4V part gave the better static test performance. Both titanium alloys exhibited strength/weight efficiency superior to a 4340 steel part tested in a previous program.
Author: Charles J. Matusovich Publisher: ISBN: Category : Titanium alloys Languages : en Pages : 89
Book Description
Ti-6Al-6V-2Sn and Ti-13V-11Cr-3Al (both solution heat-treated and aged) were evaluated. Both small-size specimens and full-size helicopter components were tested. Small-size specimens were tested for resistance to fatigue crack initiation, resistance to fatigue crack propagation, and fracture toughness. Fatigue crack initiation tests included tension-tension tests both of unnotched specimens and of joints. Helicopter main rotor cuffs were evaluated in fatigue crack initiation and fatigue crack propagation tests with expanded holes and with reamed holes. The titanium alloy cuff test results were compared to those for Ti-6Al-4V (annealed) and 4340 steel (heat-treated to a 125-ksi minimum ultimate tensile strength) cuffs and to small-size specimen tests. Tensile test data, chemical analysis and forging parameters are also presented. The crack initiation resistance of Ti-6Al-6V-2Sn was found to be superior to that of Ti-13V-11Cr-3Al. Axial tension-tension fatigue results showed 50% higher fatigue strengths for Ti-6Al-6V-2Sn than for Ti-13V-11Cr-3Al. Joint fatigue tests also showed higher strength values for the Ti-6Al-6V-2Sn alloy. Fracture toughness results were comparable for both alloys. Joint fatigue test evaluations were made for reamed, shot peened, and expanded holes. The highest fatigue strength values were associated with specimens having expanded holes. The Ti-6Al-6V-2Sn cuffs with both reamed and expanded cuff-to-spar attachment holes showed higher fatigue crack initiation strength values than those of the Ti-13V-11Cr-3Al. (Author).
Author: Publisher: ISBN: Category : Languages : en Pages : 124
Book Description
This program evaluated the effects of yttrium additions to titanium 6Al-4V alloy by means of mechanical property testing and metallurgical studies. Product forms evaluated which contained yttria (yttrium oxide) included hand forgings, die forgings, and plate material which were compared to baseline plate material which had no yttria additions. The summary of results of the mechanical property evaluations are presented below. Certain heats and specimens did appear as outliers from the norm and these have been noted. Metallographic evaluations of the yttriated material demonstrated the yttria particles are readily observable by optical and scanning electron microscopy. Fracture surface analysis on the failed fatigue and tensile specimens did not establish a direct correlation between specimen performance and yttria particles or clusters. These results indicate the effects of yttria additions are indirect and more subtle, and that the variations in data are more likely to be a consequence of the differences in mill processing procedures due to the greater hot workability of the yttriated titanium.
Author: J. Paulo Davim Publisher: Springer ISBN: 3662439026 Category : Technology & Engineering Languages : en Pages : 154
Book Description
This book presents a collection of examples illustrating the resent research advances in the machining of titanium alloys. These materials have excellent strength and fracture toughness as well as low density and good corrosion resistance; however, machinability is still poor due to their low thermal conductivity and high chemical reactivity with cutting tool materials. This book presents solutions to enhance machinability in titanium-based alloys and serves as a useful reference to professionals and researchers in aerospace, automotive and biomedical fields.
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Author: R. F. Simenz
Author: H.C. Child
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Author: Charles J. Matusovich
Author: H. J. Henning
Author: A. Tesmen
Author: J. T. M. de Hosson
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Author: J. Paulo Davim