The Rosette, Star, Tensile Fracture

1968 ◽  
Vol 90 (1) ◽  
pp. 21-27 ◽  
Author(s):  
W. R. Clough ◽  
R. M. Vennett ◽  
R. J. Hrubec
Keyword(s):  
Electron Microscope ◽  
Tensile Testing ◽  
Tensile Fracture ◽  
Fracture Modes ◽  
Fracture Topography ◽  
Fracture Configuration ◽  
Temperature Ranges ◽  
Fracture Theory ◽  
Quenched And Tempered Steel ◽  
Tempered Steel

A type of tensile fracture topography encountered fairly often in certain temperature ranges with specimens from forgings, billets, rod, and bar of quenched and tempered steel, is the “star” or “rosette.” Having available several steels which had been shown to be capable of exhibiting the rosette, star, fracture, tensile testing was done to establish the temperature ranges for which this fracture configuration was applicable. Explanations of the fracture, and determinations of the fracture modes, were sought through experimentation involving metallography and the electron microscope, and by application of continuum mathematical plasticity-fracture theory.

Prediction Model for Microstructure and Properties of Medium Carbon Non-Quenched and Tempered Steel Bar

2020 ◽  
Vol 993 ◽  
pp. 526-533
Author(s):  
Shi Kang Lu ◽  
Yu Lai Chen ◽  
Wei Yu
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Prediction Model ◽  
Prediction Models ◽  
Volume Fraction ◽  
Second Phase ◽  
Medium Carbon ◽  
Steel Bar ◽  
Quenched And Tempered Steel ◽  
Tempered Steel

In this study, the 38MnSiVS medium carbon non-quenched and tempered steel bar was investigated by optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM) and quantitative metallography. The microstructures were mainly composed of ferrite and pearlite. The phase transition-microstructure prediction models were established to calculate ferrite volume fraction fα, ferrite grain size dα and pearlite interlamellar spacing So. The volume fraction of the second phase V (C, N) was calculated by thermodynamics. The morphology of the second phase V (C, N) was observed by TEM, and the distribution of particle size of the second phase was determined. And the mechanical properties were measured. Considering the microstructural parameters (fα,dα and So), the modified coefficient of solid solution elements, and the effect of precipitates, combining with some reference models, prediction model of mechanical properties including yield strength, tensile strength and impact toughness were finally established.

SUPERELSO 1100

Alloy Digest ◽  
2012 ◽  
Vol 61 (6) ◽  
Keyword(s):  
Fracture Toughness ◽  
Yield Strength ◽  
Tensile Properties ◽  
High Yield ◽  
Steel Alloy ◽  
High Yield Strength ◽  
Weight Saving ◽  
Quenched And Tempered Steel ◽  
Tempered Steel

Abstract SuperElso 1100 is a high yield strength quenched and tempered steel alloy. For welded and weight-saving structures. This datasheet provides information on composition and tensile properties as well as fracture toughness. It also includes information on forming, machining, and joining. Filing Code: SA-654. Producer or source: Industeel USA, LLC.

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