Author: Thomas TomPublisher:
ISBN:
Category : Steel
Languages : en
Pages : 226
Book Description
Microstructural Variables and Fracture Toughness of High Strength Mo and Mo-Ni Steels
Author: Thomas TomThe Effect of Microstructure on the Fracture Toughness of Low-alloy Steels
Author: Syavash EnshaPublisher:
ISBN:
Category : Steel
Languages : en
Pages : 198
Book Description
A theoretical model has been used to relate the cleavage fracture toughness of the low-alloy steels to their microstructure. The cleavage fracture toughness of low-alloy steels depends upon three metallurgical parameters: the microscopic cleavage strength, the yield strength, and the effective root radius. Variations in fracture toughness with microstructure can be explained through the effect of the microstructure on these parameters. The major objective of this investigation has been the study of the effect of microstructural variables on these parameters, and hence the effect of microstructure on fracture toughness. The theoretical model for the cleavage fracture toughness of the low-alloy steels can be successfully applied provided the assumptions are not strongly violated. This requires low microscopic cleavage strength/yield strength ratio values and low work-hardening rates. Lower temperatures and higher strain rates both favor these conditions. (Modified author abstract).
Studies on the Relationship Between Strength, Fracture Toughness, and Microstructure in a Newly Developed 3Cr-1Mo-1Ni-0.2V Pressure Vessel Steel
Author: Richard Swift McClaughryPublisher:
ISBN:
Category :
Languages : en
Pages : 214
Book Description
Nuclear Science Abstracts
Author: Microstructure and Fracture Toughness of a High-strength Low-alloy Steel
Author: Marie Therese MiglinPublisher:
ISBN:
Category : Steel, High strength
Languages : en
Pages : 308
Book Description
The Relationship of Microstructure to Strength and Toughness in High-strength Steel
Author: John Henry BucherPublisher:
ISBN:
Category : Fractography
Languages : en
Pages : 138
Book Description
This report deals with the relationship of elements of microstructure to the fracture characteristics of a group of commercially produced steels, heat-treated to ultra-high strength levels. The microstructures were characterized in terms of optical microscopy, electron diffraction, and electron fractography. Fractographic studies were made of fractured surfaces broken in impact at +25 and -196 C as a function of tempering temperature, in slow bending at ambient temperature, in a modified bend test in which slow and fast propagation stages were effected, and on surfaces produced in tensile fractures. The fracture characteristics were studied by means of an instrumented bend test and in terms of the plastic instability generated in the torsion test. The instrumented bend test yielded data on criteria for the onset of slow crack propagation and for the onset of rapid propagation, including the effect of the total stored energy in the system. Plastic instability in torsion was studied as a function of specimen section size in AISI 4340 steel. A 250,000 psi yield strength Maraging steel was studied in a standard size test bar. (Author).
Nuclear Power Reactor Instrumentation Systems Handbook
Author: Joseph M. HarrerPublisher:
ISBN: 9780870790058
Category : Technology & Engineering
Languages : en
Pages : 1052
Book Description
Enhancement of Fracture Toughness in High Strength Steel by Microstructural Control
Author: E. R. PARKERThe Correlation of Microstructure with the Strength and Fracture Toughness of Pearlitic Steels
Author: B. E. O'DonnellyFracture Toughness Characteristics of the New Weldable Steels of 180- to 210-Ksi Yield Strengths
Author: Peter P. PuzakPublisher:
ISBN:
Category : Steel
Languages : en
Pages : 36
Book Description
The yield strength range for steels from 180 to 210 ksi is currently covered by four weldable alloys of the following nominal chemical analysis: 18%Ni-8%Co-3%Mo maraging steel, 12%Ni-5%Cr-3%Mo maraging steel, 9%Ni-4%Co-0.20%C quenched and tempered (Q and T) steel, and 10%Ni-8%Co-2%Cr-1%Mo-0.10%C Q and T steel. Broad ranges of fracture resistance have been reported for these materials based on various fracture tests, and this report presents information for material selection and design guidance by providing an analysis of the interactions between the metallurgical and mechanical parameters that contribute to the fracture resistance of plate products. Definitions of the interaction between the metallurgical and the mechanical aspects are developed with the use of the Dynamic Tear (DT) test and the Ratio Analysis Diagram (RAD). (Author).