Journal ArticleDOI
Load sharing of the phases in 1080 steel during low-cycle fatigue
TLDR
In this paper, the stress response of the individual phases in a 1080 steel was measured by means of X-ray diffraction, and the microstresses formed by differential plastic deformation of the matrix and inclusions accurately model the spheroidite.Abstract:
By means of X-ray diffraction, the stress response of the individual phases in a 1080 steel were measured. Specimens with pearlitic, spheroidal, and tempered martensitic microstructures were subjected to low-cycle fatigue and the stress-strain hysteresis loops were separated into components for the carbide and matrix phases. Calculations of the microstresses formed by differential plastic deformation of the matrix and inclusions accurately model the spheroidite. Measured microstresses in the pearlite are smaller than the predicted values, probably due to yielding of the cementite and limitations on modeling the morphology. Work-hardening rates associated with the microstresses also qualitatively agree with the measurements. The tempered martensite cyclically softens with fatigue loading. The increased plastic strain range in the tempered martensite with cyclic softening is accompanied by an increase in the microstresses. These microstresses are significantly larger than predicted.read more
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Evolution of the residual stress state in a duplex stainless steel during loading
TL;DR: In this article, the evolution of micro-and macrostresses in a duplex stainless steel during loading has been investigated in situ by X-ray diffraction on a 1.5 mm cold-rolled sheet of alloy SAF 2304 solution treated at 1050°C.
Journal ArticleDOI
Intergranular and interphase microstresses
TL;DR: A review of recent advances in the characterisation and modelling of microstresses developed between grains and phases in a polycrystal is presented in this paper, where diffraction-based measurements of residual stress fields are used to test self-consistent models for polycrystalline deformation and texture evolution.
Journal ArticleDOI
Load sharing between austenite and ferrite in a duplex stainless steel during cyclic loading
TL;DR: In this article, the load sharing between phases and the evolution of micro- and macrostresses during cyclic loading was investigated in a 1.5mm cold-rolled sheet of the duplex stainless steel SAF 2304.
Journal ArticleDOI
In situ room temperature tensile deformation of a 1% CrMoV bainitic steel using synchrotron and neutron diffraction
M.A. Weisser,M.A. Weisser,A. Evans,S. Van Petegem,Stuart Holdsworth,H. Van Swygenhoven,H. Van Swygenhoven +6 more
TL;DR: In this article, X-ray diffraction spectra have been acquired during room temperature tensile deformation of a creep-resistant bainitic 1% CrMoV steel, in order to study the evolution of internal microstresses and load-sharing mechanisms between the ferrite matrix and the various carbides.
Journal ArticleDOI
The effects of residual macrostresses and microstresses on fatigue crack propagation
TL;DR: In this paper, the effects of residual microstresses and tensile residual macrostresses on fatigue crack propagation were examined in a high-carbon steel and phase-specific diffraction measurements showed that uniaxial deformation and radial cold expansion produce predominantly microstress and macrostress fields, respectively.
References
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Numerical Recipes, The Art of Scientific Computing
Journal ArticleDOI
The Determination of the Elastic Field of an Ellipsoidal Inclusion, and Related Problems
TL;DR: In this paper, it is shown that to answer several questions of physical or engineering interest, it is necessary to know only the relatively simple elastic field inside the ellipsoid.
Journal ArticleDOI
Average stress in matrix and average elastic energy of materials with misfitting inclusions
Trevor A. Mori,K Tanaka +1 more
TL;DR: In this paper, a method of calculating the average internal stress in the matrix of a material containing inclusions with transformation strain is presented. But the authors do not consider the effects of the interaction among the inclusions and of the presence of the free boundary.
Book
Micromechanics of defects in solids
Toshio Mura,D. M. Barnett +1 more
TL;DR: In this paper, the authors present numerical simulation of intergranular and transgranular crack propagation in ferroelectric polycrystals using double kink mechanisms for discrete dislocations in BCCs.
Book
Residual Stress: Measurement by Diffraction and Interpretation
Ismail C. Noyan,J. B. Cohen +1 more
TL;DR: In this paper, the authors proposed a method to measure residual stress from X-ray diffraction data. But, their method is not suitable for the analysis of nonlinear elasticity theory.