Rupture strength of tubular steel specimens under internal hydrogen pressure at high temperatures

1959 ◽  
Vol 1 (3) ◽  
pp. 22-26
Author(s):  
N. N. Kolgatin ◽  
L. A. Glikman ◽  
V. P. Teodorovich ◽  
V. I. Deryabina
Keyword(s):  
High Temperatures ◽  
Hydrogen Pressure ◽  
Rupture Strength ◽  
Internal Hydrogen

Effect of structure on stress-to-rupture strength of molybdenum at high temperatures

1976 ◽  
Vol 8 (7) ◽  
pp. 781-785
Author(s):  
N. P. Drozd ◽  
R. K. Ivashchenko ◽  
G. G. Maksimovich ◽  
Yu. V. Mil'man ◽  
N. M. Sinchenko ◽  
...  
Keyword(s):  
High Temperatures ◽  
Rupture Strength ◽  
Effect Of Structure

Investigations on Structure and High Temperature Properties of Iridium

2007 ◽  
Vol 539-543 ◽  
pp. 2216-2221 ◽  
Author(s):  
Jürgen Merker ◽  
Bernd Fischer ◽  
David F. Lupton ◽  
Joerg Witte
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
High Temperatures ◽  
Rupture Strength ◽  
Creep Behaviour ◽  
Stress Rupture ◽  
Service Performance ◽  
Metallographic Examination ◽  
Fine Grained ◽  
Pure Metals

Due to its outstanding mechanical properties at high temperatures and chemical stability iridium is used for demanding high temperature applications. In order to obtain materials data necessary for the design of high temperature equipment and the numerical simulation of their service performance the stress-rupture strength and creep behaviour have been investigated in a temperature range between 1650°C and 2300°C. The results of metallographic and fracture examinations (SEM) revealed that, in common with other pure metals, unalloyed iridium shows marked grain growth at high temperatures. Under these conditions, the deformation characteristics of iridium may not be entirely uniform and predictable, as will be demonstrated with examples from the creep studies. Both metallographic examination and investigations by means of scanning electron microscopy gave indications of possible causes for a significant anomaly in the creep behaviour. It is therefore advantageous for the mechanical properties if a fine-grained microstructure can be maintained even at the highest service temperatures.

Short-term creep, stress-rupture strength, and failure of molybdenum-tungsten alloys at high temperatures

1990 ◽  
Vol 22 (5) ◽  
pp. 671-678
Author(s):  
V. V. Bukhanovskii ◽  
V. K. Kharchenko ◽  
V. S. Kravchenko ◽  
K. N. Kas'yan ◽  
A. A. Onoprienko ◽  
...  
Keyword(s):  
High Temperatures ◽  
Rupture Strength ◽  
Stress Rupture ◽  
Short Term ◽  
Tungsten Alloys ◽  
Stress Rupture Strength ◽  
Creep Stress ◽  
Term Creep ◽  
Short Term Creep

Microstructural Changes due to Secondary Precipitation Hardening of Martensitic Creep Resistant Steel X20CrMoWV 12 1 (AISI 422)

2008 ◽  
Vol 589 ◽  
pp. 197-202
Author(s):  
Y. Elarbi ◽  
Béla Palotás
Keyword(s):  
High Temperatures ◽  
Rupture Strength ◽  
Microstructural Development ◽  
Creep Properties ◽  
Secondary Precipitation ◽  
Steel Grades ◽  
Creep Resistant Steels ◽  
Steam Parameters ◽  
Term Creep

After development of the well-known T/P91 steel grade in the early 80’s and its long industrial experience since early 90’s, it has been necessary to develop new martensitic creep resistant steels to answer the demand of the power generation industry. New USC (ultra-super critical) boilers require materials with advanced creep properties to reach severe steam parameters. Addition of W to the steel has been found by many researches to be effective to increase creep rupture strength at high temperatures and already used in some developed steel grades such as T/P92, T/P122 and AISI 422 for the USC boilers. Recently, long-term creep strength of the advanced high Cr ferritic steels has been argued regarding the instability of their microstructures at high temperatures over 600 °C. This microstructural instability seems to be enhanced with increasing Cr content or with substitution of Mo by W in the steels. The aim of this paper is concentrated on the investigation of the microstructural development of the studied steel using the Jominy end-face quench test. Different hardness profiles from this test were introduced.

In situ REM imaging of surface processes on ceramic bulk crystals from 300 to 1670 K in a conventional TEM

1991 ◽  
Vol 49 ◽  
pp. 660-661
Author(s):  
Z. L. Wang ◽  
J. Bentley
Keyword(s):  
High Temperatures ◽  
Image Resolution ◽  
Atomic Processes ◽  
Crystal Surfaces ◽  
Beam Radiation ◽  
Surface Areas ◽  
Transmission Electron ◽  
Reflection Electron Microscopy ◽  
Gas Reactions

Studying the behavior of surfaces at high temperatures is of great importance for understanding the properties of ceramics and associated surface-gas reactions. Atomic processes occurring on bulk crystal surfaces at high temperatures can be recorded by reflection electron microscopy (REM) in a conventional transmission electron microscope (TEM) with relatively high resolution, because REM is especially sensitive to atomic-height steps.Improved REM image resolution with a FEG: Cleaved surfaces of a-alumina (012) exhibit atomic flatness with steps of height about 5 Å, determined by reference to a screw (or near screw) dislocation with a presumed Burgers vector of b = (1/3)<012> (see Fig. 1). Steps of heights less than about 0.8 Å can be clearly resolved only with a field emission gun (FEG) (Fig. 2). The small steps are formed by the surface oscillating between the closely packed O and Al stacking layers. The bands of dark contrast (Fig. 2b) are the result of beam radiation damage to surface areas initially terminated with O ions.

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