The Influence Of Mean Stress On Fatigue Crack Propagation In A Quenched And Tempered Alloy Steel

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Argonne Laboratory 9700 South Cass Avenue

(FqO,) after exposure to high-DO water. Crack propagation behavior is different for the two steels. In the carbon steel, fatigue cracks propagate preferentially along the soft ferrite grains. The low-alloy steel exhibits a typical straight fatigue crack propagating normal to the stress axis.


K is known the fatigue crack growth life (number of cycles to failure) of the component can be computed by integrating the Paris-type laws between crack length limits. In this manner both life predictions and crack growth mechanisms at the microstructure level can be assessed, leading to a complete understanding of the alloy s fatigue behavior.

Analysis of Helical Conical Spring by CAE tools

alloy steel. under this study the heat treatment processes quenching, annealing followed by tempering at 200 degree celsius was done to measure the crack length eddy current probe was used and the research result showed that the fatigue crack growth rate in quenching treated

Damage Accumulation Due to Sequential Loading Effect

This paper studies sequential loading effects on fatigue damage of the low alloy 42CrMo4 steel under a series of sequential/incremental multiaxial loading steps. It is studied the effect of sequential biaxial loading on both the fatigue life and crack growth orientation of the material. Two critical plane models are


Fatigue-Crack Propagation in 18% Cr-10% Ni Stainless Steel (304) L S. BRAHMI and P. LEHR 1601 Fatigue Crack Propogation of PS(T) Specimen Under Spectrum Loading J.H. SONG, Z.R. HUANG and J.K. CHENG 1607 Closure-Free Sequence Effect on the Near-Threshold Fatigue Crack Propagation G. HENAFF, J. PETIT, N. RANGANATHAN and B. JOURNET 1613


mean stress, surface finish, temperature, environment, and unwelded and welded components. Wei et al. [7] studied the fatigue behavior of 1500 MPa bainite/martensite duplex phase high strength steel. It was observed that fatigue strength increases and fatigue crack threshold gives lower crack propagation.


Development of New Design Fatigue Curves in Japan: Discussion of Crack Growth Behavior in Large-Scale Fatigue Tests of Carbon and Low-Alloy Steel Plates Masahiro Takanashi, Hiroshi Ueda, Toshiyuki Saito, Takuya Ogawa, Kentaro Hayashi V003T03A051 PVP2019-93555 Evaluation of Fatigue Crack Propagation by [Delta]J Approach

Fatigue - ASM International

The mean stress is the algebraic average of the maximum and minimum stress in the cycle: sm = smax +smin 2 (Eq 14.3) Two ratios frequently used in presenting fatigue data are: Stress ratio R= smin smax (Eq 14.4) Amplitude ratio A= sa sm = 17R 1+R (Eq 14.5) 14.2 High-Cycle Fatigue High-cyclefatigueinvolvesalargenumberof cycles (N4105 cycles) and an elastically applied stress. High

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corrosion environments on the crack rate propagation in HY-80 to HY-150 quenched and tempered steels have been ex-ainined under low cycle fatigue conditions. Preliminary results on a study of the directionality effects due tD ccoss-rollino on the fracture toughness of quenched and tempered


superior to alloy A. The fatigue characteristics of alloy B and C are similar. The fatigue life and the striation width at the total strain range of 0.8% of alloy C are 21,800 cycles and 2.89 µm, respectively, as shown in Fig. 3 b). Small striation width indicates that the crack propagation length per cyclic loading after crack initiation is small.

Hydrogen Embrittlement and Low Temperature Effects on

experimental results obtained by fatigue crack growth tests carried out on low- carbon, Cr-Mo and stainless steels. They considered the coupled effect of

Politecnico di Torino Porto Institutional Repository

The dies are usually fabricated using quenched and tempered ISO X40CrMoV5-17 (or AISI H13, Table 1) tool steel and are surface treated to improve their wear resistance. The recommended massive heat treatment consists of austenitizing at about 1025 °C, quenching, and double tempering in the 550 to 650 °C temperature range7-9.

Near-Threshold Fatigue Crack Propagation in Ultra-High

Fatigue crack propagation behavior of an ultra-high strength steel (800-M) has been investigated in humid air over a very wide spectrum of growth rates from 10~8 to 10~l mm/cycle. Particular emphasis has been devoted to the influence of mean stress (or load ratio R = K,n a/Kmal) and microstructure on fatigue crack growth near the thresh­ old stress intensity for crack propagation, AK0.

XVII International Colloquium on Mechanical Fatigue of

Fatigue Properties and Fatigue Crack Growth in Puddled Steel with Consideration of Microstructural Degradation Processes after 100-Years Operating Time 64 G. Lesiuk, M. Szata Analysis of Cyclic Plas tic Response of Heat Resistant Sanicro 25 Steel at Ambient and Elevated

Influence of microstructure on near- threshold fatigue

to the influence of microstructure on fatigue-fracture behaviour near the threshold stress intensity, M o' below which crack growth cannot be detected. By varying microstructure through quench and tempering and isothermal transformations, the threshold stress intensity and near-threshold crack-propagation rates are observed to be influenced by mean stress (load ratio), material strength, grain size, and impurity

Index []

Fatigue crack propagation, 49 Fatigue in vacuum, 75 Stress corrosion cracking, 62 Surface strains, 200 Eutectic composites, 154 Faceted growth (see Crystallographic fatigue cracking) Fatigue crack growth rate Stainless steel, 174 PH, 205, 209 Ti-6A14V, 78, 116 Ultra-low, 220 Fatigue crack propagation Environmental effects, 49

Deutscher Verband für Materialforschung und -prüfung e.V.

The effect of overloads on fatigue crack propagation measured by DIC, BEMI and synchrotron (#55) M. MARX, M. THIELEN, C. MOTZ 625 Determining the influence of overloads on the cyclic material behaviour of nodular cast iron (#17) C. BLEICHER, H. KAUFMANN, T. MELZ 627 Lifetime extension due to initial quasi-static tension overloads of speci-

Introduction to Surface Hardening of Steels

surface layer is quenched to form martensitic case with good wear and fatigue resistance superim-posed on a tough, low-carbon steel core. Of the various diffusion methods (Table 2), gas carburi-zation is the most widely used, followed by gas nitriding and carbonitriding. Case hardness of carburized steels is primar-ily a function of carbon content.

Fatigue Crack Propagation in a High-Strength Steel Under

using the crack tip stress-intensity factor, K. The results show that mean loads exert a strong secondary influence on fatigue crack propagation. Data were fitted to two crack propagation equations which seek to account for mean loads. Both equations significantly reduced, but did not eliminate,

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Stable crack growth Unstable crack propagation Note: The rupture zone is larger than the fatigue zone Figure 2.23 Generation of beach marks due to tension tension and reversed bending high load for unnotched specimen Figure 2.27b Formation of dimples for tension overload provided by the electron microscope (4340 steel with 180/200 ksi)