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Author : Charles W. Marschall
Publisher : Unknown
Page : 46 pages
File Size : 42,6 Mb
Release : 1961
Category : Steel, High strength
ISBN : UOM:39015095151042
Author : P. A. Kammer,K. Masubuchi,R. E. Monroe
Publisher : Unknown
Page : 132 pages
File Size : 55,7 Mb
Release : 1964
Category : Steel
ISBN : UOM:39015095154590
Weldment cracking is a broad complex field. Even if one considers only cracking of steel weldments, the problems range from cracking at temperatures near the solidus during welding to cracking at room temperature days, weeks, or months after welding is completed. Numerous reports of investigations in this field are contained in the published and unpublished literature. However, most of these reports cover only a particular problem in a specific area of the broad field of weldment cracking. This review attempts to cover the major aspects of the entire field of weldment cracking. Necessarily, the review is for the most part general, only being specific in a few instances to illustrate a point. (Author).
Author : C. J. Slunder,Walter K. Boyd
Publisher : Unknown
Page : 50 pages
File Size : 54,8 Mb
Release : 1961
Category : Steel, High strength
ISBN : UOM:39015095151026
Author : A. R. Elsea,T. H. Feron,A. M. Hall
Publisher : Unknown
Page : 52 pages
File Size : 41,9 Mb
Release : 1961
Category : Steel
ISBN : UOM:39015095154814
THE ACHIEVEMENT AND MAINTENANCE OF DESIRED DIMENSIONS IN COMPLEX, PRECISION-BUILT STRUCTURES, SUCH AS ROCKET-MOTOR CASES, ARE CRITICAL AND TECHNICALLY INVOLVED PROBLEMS. Their proper functioning demands close dimensional tolerances. Dimensional stability is extremely difficult toACHIEVE IN STEELS AT ULTRAHIGH STRENGTH LEVELS. The problem stems from interacting metallurgical factors which manifest themselves in volumetric and shape changes. The principal sources of size change are the changes in specific volume accompanying the phase transformations which occur in hardening and tempering. Distortion occurs when a part deforms in response to stress. The problem of dimensional instability is analyzed, the factors involved are discussed, and recommendations are made regarding the control of these factors. (Author).
Author : Battelle Memorial Institute
Publisher : Unknown
Page : 200 pages
File Size : 55,7 Mb
Release : 1961
Category : Steel alloys
ISBN : UOM:39015095154897
Author : J. E. Campbell,Frank Joseph Barone,D. P. Moon
Publisher : Unknown
Page : 136 pages
File Size : 51,8 Mb
Release : 1964
Category : Maraging steel
ISBN : UOM:39015095154582
Since the combination of tensile properties and toughness that can be obtained with the maraging steels is higher than can be achieved with other steels by simple heat treatments, there is considerable interest in using the maraging steels for critical components such as rocket motor cases, pressure vessels, and aircraft forgings. This report includes information on the tensile, compressive, shear, bearing, dynamic modulus, impact, bend, fatigue, creep, and rupture properties of the 18 per cent nickel maraging steels and on the effect of temperature on these properties. Data for the properties of sheet, bar, and forgings, as well as data illustrating the effect of cold rolling, variation in the heat treatment, and elevated-temperature exposure also are presented. Data on the effect of specimen orientation, which are also included, indicate that the ductility and toughness of specimens designed to evaluate the properties in the short transverse direction are somewhat lower than in the other directions. The high strength and toughness that can be obtained in the 18 per cent nickel maraging steels make them attractive for certain critical applications that require these properties. The fabrication characteristics, weldability, and simple heat treatment are other advantages of these steels. (Author).
Author : F. F. Schmidt,Horace R. Ogden
Publisher : Unknown
Page : 310 pages
File Size : 51,5 Mb
Release : 1963
Category : Molybdenum
ISBN : UOM:39015095154665
Author : F. F. Schmidt,Battelle Memorial Institute. Defense Metals Information Center
Publisher : Unknown
Page : 154 pages
File Size : 47,7 Mb
Release : 1963
Category : Tungsten
ISBN : UOM:39015095154657
The results of a state-of-the-art survey covering tungsten and ten of its alloys are presented. All data are given in tabular and graphical form covering some of the more important physical, mechanical, and metallurgical properties for each material. References are given at the conclusion of each material section.
Author : J. W. Spretnak
Publisher : Unknown
Page : 70 pages
File Size : 50,5 Mb
Release : 1961
Category : Deformations (Mechanics)
ISBN : UOM:39015095151307
The theoretical strength of metals, bas d on atomic forces, is in the order of 100 to 1000 greater than that observed. Reasons for this discrepancy are discussed in detail, but the more important ones are (1) lattice imperfections, (2) the fact th t real metals ar polycrystalline aggregates, (3) crystalline anisotropy, and (4) the ability of metals to deform by shear. Plastic flow, particularly heterogeneous plastic flow, is intimately associated with crack initiation. The precise conditions under which plastic flow c ase and bond rupturing (cracking begins are not completely understood. The body-centered cubic lattice has geometric characteristics that make it particularly susceptible to fracture with little or no preceding plastic flow. Multidirectional stress fields, both microscopic and macroscopic, affect the degree of plastic deformation that precedes crack initiation. The theory of fracture as it exists oday is reviewed. (Author).
Author : W. A. Gibeaut,E. S. Bartlett
Publisher : Unknown
Page : 104 pages
File Size : 50,9 Mb
Release : 1964
Category : Heat resistant alloys
ISBN : UOM:39015095154616
This report summarizes the information generated since the middle of 1961 on the chemical, physical, and mechanical properties of refractory metals that are coated with oxidation-resistant coatings of advanced-experimental or commercial status. It is a supplement to DMIC Report 162, Coatings for the Protection of Refractory Metals from Oxidation, dated November 24, 1961. Recent data on specific silicide- and aluminide- type coatings for columbium, molybdenum, tantalum, and tungsten and their alloys reflect general advances in coating quality and performance, understanding of the behavior of coated systems, and more complete realization of the problems associated with the use of coated hardware.
Author : F. W. Boulger,B. A. Wilcox
Publisher : Unknown
Page : 82 pages
File Size : 42,5 Mb
Release : 1964
Category : Hydrostatic pressure
ISBN : UOM:39015095154574
On October 3, 1963, a symposium was sponsored by the Bureau of Naval Weapons, Metalworking Processes and Equipment Program, on the application of high pressure in metal-deformation processing. Past research has shown that superimposed hydrostatic pressure can significantly increase the ductility at fracture of various materials. These observations have stimulated considerable interest in applying this hydrostatic-pressure effect to metal deformation processing, where it was anticipated that improved ductility and fabricability of brittle materials could be realized. Hydrostatic extrusion and hydrodynamic compressive forging were two such fabrication techniques discussed at the symposium, and preliminary results were found to be encouraging. Another fabrication process that will be investigated in the near future is sheet drawing, where the effect of superimposed pressure improves the ductility to fracture, it was noted that pressure cycling did not improve either the strength or ductility of steels containing various amounts of carbon. In addition to the mechanical-property effects, hydrostatic pressure has been found to affect measurably, numerous metallurgical properties of metals and alloys. (Author).
Author : P. J. O'Reilly
Publisher : Unknown
Page : 138 pages
File Size : 48,8 Mb
Release : 1964
Category : Alloys
ISBN : UOM:39015095154566
This report gives the experiences of several steel producers and consumers with vacuum degassing as a melting practice in the manufacture of high-strength steels for critical applications. The parameters involved in determining the effects of melting practice on mechanical properties are outlined. Pertinent melting processes are described and evaluated qualitatively. In presenting the data, vacuum degassing is compared with other melting practices such as conventional air melting and consumable-electrode vacuum-arc remelting (CEVAR). Generally, there is a trend indicating that vacuum degassing is being used in some production applications instead of air-melted or CEVAR material. In terms of higher and more uniform transverse tensile properties and impact strength, longer fatigue life, and improved cleanliness, the CEVAR alloys were the best. Vacuum degassing by any of the various methods resulted in an improvement in properties of air-melted alloys. In some instances it appeared that the quality of CEVAR alloys could be approached when stream degassing or D-H (Dortmund-Horder) treatment was applied to air melts. Recommendations are given for additional investigations on the effects of melting practice on mechanical properties of premium-quality steels. (Author).
Author : Battelle Memorial Institute. Defense Metals Information Center,James Edward Campbell
Publisher : Unknown
Page : 46 pages
File Size : 51,8 Mb
Release : 1962
Category : Solid propellant rockets
ISBN : UOM:39015095154780
Author : D. C. Ludwigson
Publisher : Unknown
Page : 186 pages
File Size : 49,5 Mb
Release : 1961
Category : Heat resistant alloys
ISBN : UOM:39015095154822
The semiaustenitic precipitation-hardenable stainless steels remain austenitic on cooling rom a solution heat treatment at about 1950 F. In this form they are readily fabricable. Subsequent treatment at about 1400 or at about 1725 F depletes the austenite of Cr and C to the extent that martensite forms on cooling to room temperature or -100 F, respectively. Final hardening is effected by tempering, or aging, at 750 to 1100 F. The semiaustenitic precipitation-hardenable stainless steels may be obtained as transformed at the mill by cold rolling. In this condition they lack the good formability of solution-heat-treated material. However, the fabricator need only temper them to obtain very high strengths. These steels have a combination of good formability, high strength, and excellent corrosion resistance that is not easily matched by other materials.
Author : J. J. English
Publisher : Unknown
Page : 190 pages
File Size : 44,5 Mb
Release : 1963
Category : Molybdenum
ISBN : UOM:39015095154731
This report supplements DMIC Report 152 which is a compilation of binary and ternary phase diagrams of columbium, molybdenum, tantalum, and tungsten. Forty new binary and 80 new ternary diagrams are included, some of these being revised versions of the previously published diagrams. Included with each binary diagram and with some ternary diagrams is a short discussion listing terminal solubilities and crystal struc tures of intermediate pahses. Many of the diagrams are tentative and are subject to revision as additional data become available. (Author).