... of these methods can faithfully reproduce the near-threshold variable amplitude fatigue response that determines the durability of machines and structures primarily because they fail to model the science behind the residual stress effect. Residual stress effects have a strong bearing on metal fatigue and owe...

... history. Although significant work has been performed in order to examine the effects of crack face contact, often called crack closure , under variations of applied loading history, little work has been done to understand the details of crack closure in materials that contain bulk residual stress fields...

.... A major part of our strategy is to use the most advanced analytical tools to characterise the oxide and metal/oxide interface microstructure, residual stresses, as well as the transport properties of the oxide. These techniques include three-dimensional atom probe (3DAP), advanced transmission electron...

...-dispersive spectroscopy analysis, supported by microhardness tests. The residual stresses were determined by a hole-drilling method, using the integral method for residual stresses calculation. Favourable compressive residual stresses are generated in laser cladded layers due to a phase transformation from...

... for C ( t ) then enables creep crack growth in service to be estimated using data collected from standard tests under mechanical loading. Finally, the paper presents some finite element calculations for defects in cylinders with welding residual stresses as validation for the new approaches. R...

..., and its FEM model is built in the paper. The effects of the initial strains on the quenching residual stresses are simulated using the self-developed FEM software in the quenching process, and the initial strains include the strain induced by temperature, the strain induced by the phase-transformation...

.... Therefore, the threshold of fatigue crack growth of brazed joints is of particular importance in the fatigue analysis of brazed components and needs to be understood well. Residual stresses have to be considered in crack growth analysis in the threshold regime. The corresponding effects are explored...

..., will achieve results not obtainable by other means. In addition, examples are provided illustrating successful use of the process to produce low stress parts. KEYWORDS: uphill quenching, glycol quenching, water quenching, stress relief, aluminum, residual stress, heat treatment, liquid nitrogen, cryogenic...

... of steel chemistry on the phase diagram, effect of thermomechanical processing on microstructure, and influence of microstructure or residual stress on mechanical properties. Journal of ASTM International, Vol. 6, No. 7 Paper ID JAI102021 Available online at www.astm.org Satyam S. Sahay,1 Goutam Mohapatra...

...Ashok Kumar Nallathambi; Yalcin Kaymak; Eckehard Specht; Albrecht Bertram Quenching is a complex thermo-mechano-metallurgical problem. Unexplored or without an optimized cooling strategy, a quenching process can end up with high residual stresses and distortion. This paper presents the mathematical...

... with respect to size and shape distortion, retained austenite, and residual stress values. Testing was performed on a torque converter piston, an automotive powertrain component stamped from a sheet of 3-mm cold-worked SAE 1010 steel. A total of 53 pistons were used. While the heat treatment conditions...

... with a discussion of limitations and drawbacks of contemporary models with an emphasis on the complementary steps that have to be taken in collaboration with the industry. 04 04 2008 25 11 2008 23 01 2009 quenching heat treatment simulation residual stress microstructure distortion...

... 04 2008 09 09 2008 27 01 2009 modeling finite element analysis (FEA) computational fluid dynamics (CFD) finite element quenching distortion residual stress References MacKenzie , S. D. , Kumar , A. , and Metwally , H. , “ Optimizing Agitation and Quench...

... quenching TTT and CCT diagrams FORTRAN subroutines residual stress References J.   Rohde and A.   Jeppsson , “ Literature Review of Heat Treatment Simulations with Respect to Phase Transformation, Residual Stresses and Distortion ,” Scand. J. Metall.   0371-0459 , Vol. 29 , No. ( 2...

..., the original benefits achieved in sheet metal distortion control and optimum distortion and residual stress control of thicker products has diminished. Currently, there is a significant lack of understanding regarding glycol quenching and, as a result, the full benefit of this technology is not currently being...

...K. Arimoto; S. Yamanaka; K. Funatani Case carburizing is recognized as a suitable process for realizing low distortion and high compressive stresses near the surfaces under optimal conditions. Patterns of distortion and residual stresses in carburized cylinders and rings under different conditions...

...C. J. Aird; S. Hadidi-Moud; C. E. Truman; D. J. Smith The presence of tensile residual stress in cracked structures combined with external loading leads to circumstances where a structure may fail at a lower applied load than when residual stresses are not present. This is taken into consideration...

... advanced surface treatments. These tests were representative of the conditions found in a turbine engine blade to disk attachment. Laser shock processing and low plasticity burnishing have been shown to produce deep compressive residual stresses with relatively little cold work. Testing showed...

...Michael R. Hill; John E. VanDalen This paper describes tests carried out to evaluate whether comparable values of fracture toughness may be determined from coupons that contain a range of residual stress. Coupons for fracture toughness testing are taken from a single rolled plate of 7075-T6...

... test method produced results that were independent of specimen width and produced steady-state constantamplitude data in the near-threshold regime, after the crack had grown several compressive plastic-zone sizes. KEYWORDS: fatigue, threshold, crack growth, residual stress, aluminum, titanium...