Quantification of Compositional and Residual Stress Effects on Lattice Strain in Dual-phase Stainless Steels by Means of Differential Aperture X-ray Micro-diffraction

• Published in: Acta metallurgica sinica : English letters 2013-12, Vol.26 (6), p.663-668
• Main Authors: Li, Nan, An, Zhinan, Liu, Wenjun, Wang, Yandong
• Format: Article
• Language: English
• Subjects: Apertures; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composition effects; Corrosion and Coatings; Dual phase steels; Duplex stainless steels; Failure; Ferrite; Lattice strain; Materials Science; Metallic Materials; Nanotechnology; Organometallic Chemistry; Residual stress; Spectroscopy/Spectrometry; Stainless steels; Tensors; Tribology; X-rays; X射线; 光圈; 双相不锈钢; 射手; 应力影响; 成分; 晶格应变; 残余应力
• ISSN: 1006-7191; 2194-1289
• DOI: 10.1007/s40195-013-0328-0

Residual stress is an important factor for evaluating the deformation and failure of engineering materials. Diffraction-based measurement assumes that the full measured lattice strain tensor contributes to residual stress according to Hookers Law. The present work focuses on the lattice strain determination of individual grains in a dual-phase stainless steel （DPSS） by means of differential-aperture X-ray micro-diffraction （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 （c~） and austenite （~） phases in DPSS. Therefore, quantification of compositional and residual stress effects on lattice strain was conducted in order to evaluate the true residual stress inside engineering materials.