Quantification of Compositional and Residual Stress Efects on Lattice Strain in Dual-phase Stainless Steels by Means of Diferential Aperture X-ray Micro-difraction
来源期刊：Acta Metallurgica Sinica2013年第6期
论文作者：Nan LI Zhinan AN Wenjun LIU Yandong WANG
文章页码：663 - 668
摘 要：Residual stress is an important factor for evaluating the deformation and failure of engineering materials.Difraction-based measurement assumes that the full measured lattice strain tensor contributes to residual stress according to Hooke s Law.The present work focuses on the lattice strain determination of individual grains in a dual-phase stainless steel（DPSS）by means of diferential-aperture X-ray micro-difraction（DAXM）.The results show that the residual stress only takes part of the responsibility of the total measured lattice strain.In fact,the compositional variation inside the material was found to cause greater strain gradient in both ferrite（α）and austenite（γ）phases in DPSS.Therefore,quantification of compositional and residual stress efects on lattice strain was conducted in order to evaluate the true residual stress inside engineering materials.
Nan LI1，Zhinan AN2，Wenjun LIU3，Yandong WANG4
1. School of Materials Science and Engineering,Beijing Institute of Technology2. Department of Materials Engineering,the University of Tennessee3. Advanced Photon Source,Argonne National Laboratory4. State Key Laboratory of Advanced Metals and Materials,University of Science and Technology Beijing
摘 要：Residual stress is an important factor for evaluating the deformation and failure of engineering materials.Difraction-based measurement assumes that the full measured lattice strain tensor contributes to residual stress according to Hooke s Law.The present work focuses on the lattice strain determination of individual grains in a dual-phase stainless steel（DPSS）by means of diferential-aperture X-ray micro-difraction（DAXM）.The results show that the residual stress only takes part of the responsibility of the total measured lattice strain.In fact,the compositional variation inside the material was found to cause greater strain gradient in both ferrite（α）and austenite（γ）phases in DPSS.Therefore,quantification of compositional and residual stress efects on lattice strain was conducted in order to evaluate the true residual stress inside engineering materials.
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