11. Internationales Gespräch über Wärmebehandlungsfragen (Wärmebehandlung und Dauerschwingfestigkeit) / 11th International Discussion on Heat-treatment Problems (Heat-treatment and Fatigue Strength) / 11e colloque international sur des problèmes de traitement thermique (traitement thermique et résistance à la fatigue)

1966 ◽  
Vol 8 (9) ◽  
pp. 342-344
Author(s):  
E. Kubalek ◽  
H. Müller
Keyword(s):  
Heat Treatment ◽  
Fatigue Strength ◽  
Traitement Thermique

Correlation of Residual Stresses in the Fatigue Strength of Axles

1942 ◽  
Vol 9 (2) ◽  
pp. A85-A90
Author(s):  
O. J. Horger ◽  
H. R. Neifert
Keyword(s):  
Heat Treatment ◽  
Fatigue Strength ◽  
Residual Stresses ◽  
High Surface ◽  
Full Size ◽  
Tensile Stresses ◽  
Compressive Stresses ◽  
Actual Service

Abstract The object of this paper is to present a correlation between residual stresses, obtained by heat-treatment, with fatigue values, determined from an investigation of full-size railroad axles. The axles tested were of both solid and tubular design and represent members which could be used under a car in actual service. It was found from these tests that high axle fatigue strength is associated with high surface residual compressive stresses, and lowest axle strength values with surface residual tensile stresses.

Fatigue Behavior of Age-Hardening Cu-6Ni-1.5Si Alloys with Different Grain Sizes

2021 ◽  
Vol 1016 ◽  
pp. 125-131
Author(s):  
Masahiro Goto ◽  
T. Yamamoto ◽  
S.Z. Han ◽  
J. Kitamura ◽  
J.H. Ahn ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Grain Size ◽  
Fatigue Strength ◽  
Solution Heat Treatment ◽  
Fatigue Behavior ◽  
Fatigue Tests ◽  
The Other ◽  
Age Hardening ◽  
Grain Sizes ◽  
Thermomechanical Processes

On the thermomechanical treatments of Cu-Ni-Si alloy, cold-rolling (CR) before solution heat treatment (SHT) is commonly conducted to eliminate defects in a casting slab. In addition, a rolling is applied to reduce/adjust the thickness of casting slab before SHT. In a heavily deformed microstructure by CR, on the other hand, grain growth during a heating in SHT is likely to occur as the result of recrystallization. In general, tensile strength and fatigue strength tend to decrease with an increase in the grain size. However, the effect of difference in grain sizes produced by with and without CR before SHT on the fatigue strength is unclear. In the present study, fatigue tests of Cu-6Ni-Si alloy smooth specimens with a grain fabricated through different thermomechanical processes were conducted. The fatigue behavior of Cu-Ni-Si alloy was discussed.

scholarly journals Liftime Optimization of Hot Forged Aerospace Components by Linking Microstructural Evolution and Fatigue Behaviour

2011 ◽  
Vol 278 ◽  
pp. 162-167 ◽  
Author(s):  
Hermann Maderbacher ◽  
H.P. Gänser ◽  
Martin Riedler ◽  
Michael Stoschka ◽  
Martin Stockinger ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Finite Element ◽  
Fatigue Strength ◽  
Microstructural Evolution ◽  
Manufacturing Process ◽  
Fatigue Behaviour ◽  
Strength Distribution ◽  
Fatigue Properties ◽  
Finite Element Code ◽  
Static Properties

Heavy-duty aerospace components are frequently hot forged to satisfy the high requirements concerning their mechanical behaviour. Only the usage of high-performance materials together with a near-optimum manufacturing process enables the production of parts that are at the same time lightweight and mechanically extremely durable. Not only the static properties, but also the fatigue behaviour of Inconel718 is strongly influenced by the material’s microstructure resulting from the forging and heat treatment processes. Therefore, the static and fatigue properties may be controlled via the microstructural properties by suitably adjusting the parameters of the manufacturing processes. The present work links the complete forging and heat treatment process to the local distribution of the material’s fatigue strength within a component; the effect of the operating temperature is also considered. To this purpose, an empirical model is derived from fatigue tests on specimens with different microstructures at different temperatures. The resulting fatigue strength model is implemented, along with a microstructural evolution model from earlier work [1], into a finite element code in order to predict the local fatigue strength distribution in a component after being subjected to an arbitrary forging process. In a further step, the finite element code is linked to an optimization tool for determining the optimum set of manufacturing process parameters such that the component lifetime is maximized while taking process constraints into consideration.

scholarly journals Relationships among the Microstructure, Mechanical Properties, and Fatigue Behavior in Thin Ti6Al4V

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Y. Fan ◽  
W. Tian ◽  
Y. Guo ◽  
Z. Sun ◽  
J. Xu
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Fatigue Strength ◽  
Laser Welding ◽  
Fracture Strength ◽  
Fatigue Behavior ◽  
Fatigue Properties ◽  
Proof Stress ◽  
Martensite Microstructure

The microstructures of Ti6Al4V are complex and strongly affect its mechanical properties and fatigue behavior. This paper investigates the role of microstructure on mechanical and fatigue properties of thin-section Ti6Al4V sheets, with the aim of reviewing the effects of microstructure on fatigue properties where suboptimal microstructures might result following heat treatment of assemblies that may not be suited to further annealing, for example, following laser welding. Samples of Ti6Al4V sheet were subjected to a range of heat treatments, including annealing and water quenching from temperatures ranging from 650°C to 1050°C. Micrographs of these samples were inspected for microstructure, and hardness, 0.2% proof stress, elongation, and fracture strength were measured and attributed back to microstructure. Fractography was used to support the findings from microstructure and mechanical analyses. The strength ranking from high to low for the microstructures of thin Ti6Al4V sheets observed in this study is as follows: acicularα′martensite, Widmanstätten, bimodal, and equiaxed microstructure. The fatigue strength ranking from high to low is as follows: equiaxed, bimodal, Widmanstätten, and acicularα′martensite microstructure.

1201 Effect of heat treatment on fatigue strength of electroplated copper thin films

2008 ◽  
Vol 2008.1 (0) ◽  
pp. 143-144
Author(s):  
Naokazu MURATA ◽  
Kinji TAMAKAWA ◽  
Ken SUZUKI ◽  
Hideo MIURA
Keyword(s):  
Thin Films ◽  
Heat Treatment ◽  
Fatigue Strength ◽  
Electroplated Copper

scholarly journals The impact of heat treatment and shot peening on the fatigue strength of 51CrV4 steel

2016 ◽  
Vol 2 ◽  
pp. 3330-3336 ◽  
Author(s):  
Andrzej Kubit ◽  
Magdalena Bucior ◽  
Władysław Zielecki ◽  
Feliks Stachowicz
Keyword(s):  
Heat Treatment ◽  
Fatigue Strength ◽  
Shot Peening ◽  
The Impact

scholarly journals Effect of Laser Preheating AISI 4140 Specimens for Micro-Forging

2017 ◽  
Vol 62 (2) ◽  
pp. 1209-1213
Author(s):  
C. Jung ◽  
M.G. Lee ◽  
Y. Jeon
Keyword(s):  
Heat Treatment ◽  
Fatigue Life ◽  
Fatigue Strength ◽  
Surface Treatment ◽  
Laser Heat Treatment ◽  
Forging Process ◽  
Advantages And Disadvantages ◽  
Treatment Processes ◽  
Laser Heat ◽  
Aisi 4140

Abstract Many high performance and permanent service parts require suitable material characteristics-high fatigue strength is one of the most important characteristics. For this reason, surface treatment processes are essential to increase the material performance and avoid the use of costly ineffective material. There exist various surface treatment processes for various applications. Each process has advantages and disadvantages and hybridization can solve various problems. The micro-forging process delivers a controlled and uniform surface hardness, but the depth of the forged surface is limited. On the other hand, laser heat treatment can increase the hardness drastically, but the surface may become brittle, which reduces the fatigue life. Laser-assisted micro-forging is a novel hybrid process of laser heat treatment and micro-forging that has the potential to increase the forging depth and relax the stress caused by the high temperature of the forging process. This study examines the effect of laser preheating in the micro-forging of AISI 4140. The processes were varied as follows: no treatment, micro-forging only, and laser-assisted micro-forging. The fatigue strength of the specimens was examined by means of an ultrasonic fatigue tester and then compared. The microstructural changes were investigated with respect to the processes by using scanning electron microscopy. In conclusion, it was confirmed that the laser preheating auxiliary forging affects the fatigue life. It was confirmed that the fatigue life was the mostly increased in 550°C temperature laser preheating micro forging process and the temperature was identified as the most important factor.

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