Improving the Toughness of Ultrahigh Strength Steel
Author : Kōji Satō
Publisher :
Page : 330 pages
File Size : 11,58 MB
Release : 2002
Category :
ISBN :
Author : Kōji Satō
Publisher :
Page : 330 pages
File Size : 11,58 MB
Release : 2002
Category :
ISBN :
Author :
Publisher :
Page : 5 pages
File Size : 45,80 MB
Release : 2002
Category :
ISBN :
The ideal structural steel combines high strength with high fracture toughness. This dissertation discusses the toughening mechanism of the Fe/Co/Ni/Cr/Mo/C steel, AerMet 100, which has the highest toughness/strength combination among all commercial ultrahigh strength steels. The possibility of improving the toughness of this steel was examined by considering several relevant factors.
Author : William Robert Warke
Publisher :
Page : 36 pages
File Size : 29,77 MB
Release : 1962
Category : Steel, High strength
ISBN :
Strengthening methods for ultrahigh- trength s e ls are describ a i cus ed. The objective is to provid the designer with an idea of t e prop rti s which can be developed by various proces es and th operating personnel with an outline of procedure The processes include the conventional quench and t per, martempering, Ausforming, prestrain a d r p r, pr cipitation hardening as it applies to special steel compositions designed for this purpose (i.e., mar gi g), and austempering. Included for each method is ou line of the proces bul ion of the chanical properties whic c n be expected, iscussion of ny limitations which the process may have, and if available, an explanation of the mech nis of strengthening. (Author).
Author :
Publisher :
Page : 238 pages
File Size : 40,74 MB
Release : 1965
Category : Technology & Engineering
ISBN :
Author : A. M. Hall
Publisher : ASTM International
Page : 29 pages
File Size : 37,34 MB
Release : 1971
Category : Steel alloys
ISBN :
Author :
Publisher :
Page : 169 pages
File Size : 35,51 MB
Release : 1993
Category :
ISBN :
A systems approach to materials design is extended to adaptive microstructures undergoing a programmed dynamic evolution in both processing and service to achieve novel combinations of properties. Fundamental principles are developed to support rational design of high-toughness ultrahigh-strength martensitic steels of interest for advanced armor and high performance gear applications. Theoretical modelling and high resolution microanalytical experiments in the martensitic alloys address control of autocatalytic coherent precipitation to achieve efficient strengthening without embrittlement, and the controlled precipitation of optimal stability metastable austenite for adaptive dilatant transformation plasticity tuned to crack-tip stress states for efficient interaction with strain localization processes in ductile fracture. Fracture toughness, Precipitation strengthening, Transformation toughening.
Author : Stephen D. Antolovich
Publisher :
Page : 53 pages
File Size : 12,79 MB
Release : 1975
Category :
ISBN :
If 300 grade maraging steel is heat-treated to contain a distribution of tough austenite in an aged martensitic matrix, the fracture toughness can be improved significantly with only minimal decreases in the ultimate tensile strength. Studies have been carried out to determine the reasons for this increase. In particular the structure has been characterized by scanning (SEM) and transmission electron microscopy (TEM), plastic zone sizes and shapes have been determined by microhardness and etching techniques, plane-strain crack tip opening displacements have been measured under loading, and fracture surfaces have been examined both by scanning and replica electron fractography. In addition, a survey of the fatigue crack propagation (FCP) characteristics have been carried out. Some testing was done at -196 C. The fracture toughness of the specially treated steel was equivalent to what was obtained for conventionally treated steel at room temperature. This process was extended to the ultra high strength 350 grade steel and again a significant improvement in toughness was obtained although the magnitude of the increase was not as large as was obtained for the 300 grade steel. A model based on the energy absorbed during plastic deformation of the austenite in the plastic enclave ahead of the crack tip has been proposed and is in good agreement with the experimental results. In some cases, heat treatments were used that result in formation of metastable austenite which transforms to martensite at crack tip on loading. This is a mode of plastic deformation that is responsible for very high toughness.
Author : John Frederick Knott
Publisher : Gruppo Italiano Frattura
Page : 288 pages
File Size : 13,33 MB
Release : 1973
Category : Fracture mechanics
ISBN : 0408705299
Author : Koh-ichi Sugimoto
Publisher : MDPI
Page : 158 pages
File Size : 23,24 MB
Release : 2020-11-19
Category : Technology & Engineering
ISBN : 3039434284
A variety of topics concerning ultrahigh-strength ferrous steels were collected in this book. At present, most of the ferrous steels are applied to cold sheet parts. However, they may be used as the materials of hot-forged parts in the future, because of the excellent performance of the mechanical properties. It is hoped that many researchers will have an interest in the applications of the ferrous steels to the hot-forging parts.
Author : Mohamed Goune
Publisher : John Wiley & Sons
Page : 420 pages
File Size : 11,75 MB
Release : 2023-12-08
Category : Technology & Engineering
ISBN : 1394257422
In recent years, significant developments have been made to increase the mechanical strength of steels in order to reduce the overall weight of structures, particularly in motor vehicles. Depending on the application, the increase in strength should not be at the expense of forming and in-use properties. The development of ultra-high strength steels requires a search for new trade-offs between these properties in order to optimize the final microstructure. New Advanced High Strength Steels analyzes the interactions between tensile mechanical properties and properties such as work hardening, anisotropy, resistance to rupture, fatigue life, corrosion resistance, crashworthiness, edge retention, hydrogen resistance and weldability. It also examines the links between the microstructural parameters of high-strength steels and the properties mentioned above. It highlights the metallurgical developments that have been necessary for the emergence of these new generations of steels. The book concludes with a look ahead to future developments in ultra-high strength steels