scholarly journals On New Axial Fatigue Testing Machine for High Temperature Tests

1959 ◽  
Vol 8 (68) ◽  
pp. 415-418
Author(s):  
Minoru KAWAMOTO ◽  
Tsuneshichi TANAKA ◽  
Yoshimasa MIKI
Keyword(s):  
High Temperature ◽  
Fatigue Testing ◽  
Testing Machine ◽  
Axial Fatigue

scholarly journals On New Fatigue Testing Machine for Combined Tension and Bending at High Temperature

1956 ◽  
Vol 5 (34) ◽  
pp. 410-414
Author(s):  
Toshio NISHIHARA ◽  
Shuji TAIRA ◽  
Kichinosuke TANAKA ◽  
Yojiro MURATA
Keyword(s):  
High Temperature ◽  
Fatigue Testing ◽  
Testing Machine

A New Type of Adjusting Coaxiality Structure Design

2014 ◽  
Vol 983 ◽  
pp. 436-439
Author(s):  
Bao Rui Sun ◽  
Yan Zheng ◽  
Yong Zhang ◽  
Xiao Wang Fan
Keyword(s):  
Fatigue Testing ◽  
Testing Machine ◽  
Structure Design ◽  
Test Results ◽  
New Type ◽  
Concentric Structure ◽  
Axial Fatigue

This paper analyzes the factors that cause axial fatigue testing machine not coaxiality and influence on test results, put forward the axial fatigue testing machine alignment inspection, and designed a new type concentric structure to adjust not coaxiality.

Micromechanical Study on High-Temperature Behavior of ZrO2 Particle-Dispersed Ni Composites

2007 ◽  
Vol 340-341 ◽  
pp. 95-100 ◽  
Author(s):  
Hideaki Tsukamoto ◽  
Andrei G. Kotousov
Keyword(s):  
High Temperature ◽  
Creep Behavior ◽  
Fatigue Testing ◽  
Testing Machine ◽  
Temperature Behavior ◽  
Laser Sensor ◽  
Compression Tests ◽  
Creep Tests ◽  
Zro2 Particle ◽  
High Temperature Behavior

This paper aims to investigate high temperature behavior of ZrO2 particle-dispersed Ni composites. The tension-compression tests under constant stress rates as well as creep tests including stress-dip tests were performed using a high-temperature material testing set up, which consists of an electric-hydraulic fatigue testing machine, electric furnace and extensometer with a laser sensor. ZrO2 particle-dispersed Ni composites were fabricated by using the powder metallurgical methods. The results obtained from the experimental study show that ZrO2 particles remarkably strengthen the composite and there exists a reasonable correlation between the tensioncompression stress-strain relation and the creep behavior. In addition, the creep behavior has been examined based on the micromechanical concept, which takes into account the diffusional mass flow at the interface between the particles and matrix. Some numerical analysis based on this concept demonstrates that even a little amount of ZrO2 particles can effectively increase the creep resistance of the composites

scholarly journals Effects of Different Melting Technologies on the Purity of Superalloy GH4738

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1838 ◽  
Author(s):  
Zhengyang Chen ◽  
Shufeng Yang ◽  
Jinglong Qu ◽  
Jingshe Li ◽  
Anping Dong ◽  
...  
Keyword(s):  
High Temperature ◽  
Inductively Coupled Plasma ◽  
Fatigue Testing ◽  
Testing Machine ◽  
Melting Process ◽  
Atomic Emission ◽  
Inductively Coupled ◽  
Elemental Analyses ◽  
Melting Technique ◽  
Forming Defects

The choice of melting technique is crucial for controlling the purity of a superalloy, which is especially important because purity has come to limit progress in the superalloy field. In this study, double- and triple-melting techniques were used to refine the GH4738 superalloy. Elemental analyses, inductively coupled plasma-atomic emission spectroscopy, X-ray diffraction analysis, scanning electron microscopy with energy-dispersive spectroscopy, high-temperature cupping machine, high-temperature fatigue testing machine, and Image-Pro Plus software were used to analyze and compare the contents of specific elements, the types and sizes of inclusions, the mechanical properties, and the probabilities of white spot formation using the two melting techniques. The effects of the different melting processes on the purity of the superalloy were systematically studied. In terms of controlling the presence of impurities, the triple-melting process resulted in lower levels of harmful N, S, and O impurities in the superalloy, the triple-melted superalloy also contained fewer types of inclusion of smaller sizes and in smaller amounts than the double-melted alloy. Triple melting also promotes tensile strength and fatigue life, and minimizes the probability of forming defects in the superalloy.

High-Temperature Ultrasonic Fatigue Testing at 1000°C

2014 ◽  
Vol 891-892 ◽  
pp. 1413-1418
Author(s):  
Yoshiyuki Furuya ◽  
Kazuo Kobayashi ◽  
Masao Hayakawa ◽  
Masao Sakamoto ◽  
Yutaka Koizumi ◽  
...  
Keyword(s):  
High Temperature ◽  
Fatigue Testing ◽  
Turbine Blades ◽  
Testing Machine ◽  
Fatigue Tests ◽  
Testing System ◽  
Resistant Steel ◽  
Heat Resistant Steel ◽  
Heat Resistant ◽  
Ultrasonic Fatigue

A high-temperature ultrasonic fatigue testing system was developed to evaluate the gigacycle fatigue properties of single-crystal superalloys used in aircraft engine turbine blades. In this development, a commercial ultrasonic fatigue testing machine was considerably modified to achieve high-temperature fatigue testing. The developed system took account of temperature dependency of Youngs modulus, and also had a function to evaluate the Youngs modulus. In order to protect the testing system from the heat of a specimen, straight and round rods were inserted between the testing system and the specimen. Other modifications achieved accurate control of temperature, edge displacement and resonance frequency, which were necessary for accurate control of stress amplitude. The testing system was first applied to a heat-resistant steel at 650 °C to check its accuracy, and next to SC superalloy samples at 1000 °C. In the conventional fatigue tests on the heat-resistant steel, the results were coincident in a frequency range from 1 Hz to 800 Hz, suggesting that comparable results would be obtained in ultrasonic fatigue testing at 20 kHz. In case of the SC superalloy samples, conventional fatigue tests were conducted at only 10 Hz, so the frequency effects were not clarified. In both cases, ultrasonic fatigue testing showed good agreement with conventional fatigue testing. The accuracy of the developed system is therefore high, even at 1000 °C. In these results, the SC superalloys showed no fatigue limit, indicating gigacycle fatigue tests to be necessary.

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