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ScienceDirect - Materials Science and Engineering A : On the influence of residual stresses in determining the micro-yield stress profile in a nitrided steel by nano-indentation .nojs { display: none; } 350? '350px':'auto'); max-height:60; height:expression(this.scrollHeight > 60? '60px':'auto');overflow:hidden;"> Athens/Institution Login Not Registered? User Name: Password: Remember me on this computer Forgotten password? Home Browse My Settings Alerts Help Quick Search Title, abstract, keywords Author Journal/book title Volume Issue Page Materials Science and Engineering A Volume 342, Issues 1-2, 15 February 2003, Pages 311-319 Font Size: Abstract Abstract - selected Article Figures/Tables Figures/Tables - selected References References - selected Purchase PDF (519 K) E-mail Article Add to my Quick Links Cited By in Scopus (11) Related Articles in ScienceDirectProcedure for residual stress profile determination by ...Mechanics of Materials Procedure for residual stress profile determination by curvature measurementsMechanics of Materials, Volume 37, Issue 8, August 2005, Pages 887-898Vincenzo M. Sglavo, Marco Bonafini, Andrea PrezziAbstractA procedure is presented for the measurement of residual stress profile in regular geometry bodies such as plates and disks. The experimental work is based on the sole measurement of the sample curvature deriving from progressively etching one of its surfaces. A relationship is obtained to correlate curvature data as function of etching depth to the original residual stress profile. The sensitivity of the method and the influence of possible experimental errors are analyzed. The technique is then applied to strengthened glass samples produced by both thermal tempering and ion exchange and obtained results are compared to data obtained by available alternative technique to demonstrate the validity of the proposed approach. Purchase PDF (531 K) Processing of glasses with engineered stress profilesJournal of Non-Crystalline Solids Processing of glasses with engineered stress profilesJournal of Non-Crystalline Solids, Volume 344, Issues 1-2, 15 September 2004, Pages 73-78Vincenzo M. Sglavo, Andrea Prezzi, Marco AlessandriniAbstractThe introduction of a compressive residual stress with a maximum below the glass surface can promote the stable growth of surface flaws and result in high strength value with limited scatter. Such approach has been reduced to practice in recent years using a double ion-exchange process. Obtained glasses have been named as engineered stress profile (ESP) glasses to emphasize the engineering design approach. In the present work, an alternative production technique, based on physical processes to obtain the specific residual stress profile in soda-lime silicate glass is presented.The proposed technique consists of a conventional physical tempering followed by a fast heating treatment necessary to relax the compressive stress on the surface only. Such relaxation is produced by rapid treatment in a fused tin bath. ESP glasses produced in this manner are compared in terms of residual stress profile, mechanical strength and failure behaviour. Purchase PDF (474 K) The evaluation of strain-, stress- and D0-profiles or g...Structural and Residual Stress Analysis by Nondestructi... The evaluation of strain-, stress- and D0-profiles or gradients with the depth from the surfaceStructural and Residual Stress Analysis by Nondestructive Methods, 1997, Pages 352-399Viktor Hauk View More Related Articles View Record in Scopus doi:10.1016/S0921-5093(02)00309-X Copyright © 2002 Elsevier Science B.V. All rights reserved. On the influence of residual stresses in determining the micro-yield stress profile in a nitrided steel by nano-indentation C. Jacqa, G. Lormandb, D. Néliasc, D. Girodind and A. Vincent, , b a SNECMA, Site de Villaroche, 77550, Moissy Cramayel, Franceb GEMPPM (UMR CNRS 5510) Bât. St Exupéry, INSA de Lyon 69621, Villeurbanne Cedex, Francec LMC (UMR CNRS 5514) Bât. Jean D'Alembert, INSA de Lyon 69621, Villeurbanne Cedex, Franced SNR Roulements, BP 2017-74010, Annecy Cedex, France Received 12 September 2001; revised 11 May 2002. Available online 7 June 2002. References and further reading may be available for this article. To view references and further reading you must purchase this article. AbstractA new method has recently been developed for obtaining the local micro-plasticity properties of materials from nano-indentation measurements. This method is based upon the measurement and analysis of remanent displacement er versus the maximum load W, produced during successive nano-indentation loading-unloading cycles at an increasing W. The present paper is concerned with the influence of residual stresses in determining the local micro-yield stress using this method. First, the influence of residual stresses on er is evidenced experimentally on nitrided 32CrMoV13 samples by studying the effect of the redistribution of residual stress that occurs when the initial component is sectioned in different ways. Second, the actual residual stress at any measurement point is calculated for every sample configuration. This is achieved by identifying the volume dilatation strain profile in the nitrided layer. Third, the influence of residual stresses on er is simulated using a three-dimensional elasto-plastic contact code. In this way, we obtain the remanent displacement that would be measured if the material were free of residual stress. We then propose a new method for obtaining the local micro-yield stress in the presence of residual stresses. This method is then applied to the determination of the intrinsic micro-yield stress profile of nitrided 32CrMoV13 steel. The results show that in some specific configurations the micro-yield stress may be overestimated by some 20%. Author Keywords: Nano-indentation; Residual stress; Micro-yield stress; Surface-hardened steel; Nitrided layer Article Outline1. Introduction2. Experimental2.1. Materials2.2. Nano-indentation test2.3. Nano-indentation response in samples S1 to S53. Determining local residual stress3.1. Residual stress versus volume dilatation strain in a treated plate of infinite size3.2. Application to the nitrided plate3.3. Determining the local residual stress in small samples4. Simulation of the residual stress effect on remanent displacement4.1. Simulation of the nano-indentation test accounting for residual stresses4.2. Determining the remanent displacement free of residual stress5. Application to the determination of microplasticity characteristics of nitrided steel5.1. From remanent displacement to micro-yield stress5.2. Application to the determination of the micro-yield shear stress profile6. ConclusionReferences Fig. 1. Geometry of samples cut from the large nitrided plate. View Within ArticleFig. 2. Description of the two measurement procedures; P1: NI tests were performed after the removal of successive layers; the measurement points were located along the symmetry axis of the specimen parallel to Ox (see Fig. 1) at different distances d from one edge; P2: NI tests were performed on a cut perpendicular to the nitrided surface. View Within ArticleFig. 3. Remanent displacement er versus maximal applied load W, measured at different distances d from the edge of sample S2. View Within ArticleFig. 4. Remanent displacement er versus depth p in the nitrided layer for different maximum applied loads W (ranging from 50 to 650 mN); sample S5. View Within ArticleFig. 5. Residual stress and volume dilatation strain Vnl×EC profiles of nitrided 32CrMoV13 steel. Comparison between measured and recalculated residual stresses. View Within ArticleFig. 6. Variation of the calculated residual stress components versus the distance d from the middle of the edge (d=0) to the center (d=5000 μm), along the symmetry axis of the upper surface of samples S1 and S2. View Within ArticleFig. 7. Influence of residual stress on the calculated remanent displacement er (with τe=1000 MPa) vs. maximum applied load W. The residual stress is that calculated at different distances d from the edge of sample S1 (see Section 3.2). View Within ArticleFig. 8. Variation of the calculated remanent displacement er (with τe=1000 MPa) versus the first invariant of the residual stress tensor tr(σr) for different maximum applied loads W; each series of calculated values for er (marked symbols) is ruled by a linear law. View Within ArticleFig. 9. Variation of the slope s (of the straight lines er vs. tr(σr) shown in Fig. 8) as a function of τe for the different values of W used in the NI tests; each series of calculated values of s (marked symbol) is ruled by the logarithmic law s=c1(W) ln(τe)+c2(W) (continuous line). View Within ArticleFig. 10. Variation of the calculated remanent displacement er0 vs. τe0−τe, for the different values of W used in the NI tests; each series of calculated values of s (marked symbols) is ruled by the power law er0=c3(W)[τe0(W)−τe]c4(W). View Within ArticleFig. 11. Comparison between the calculated and measured remanent displacement er vs. the distance d from the edge of the sample, for W=650 mN and for samples S1 and S2. View Within ArticleFig. 12. Intrinsic and apparent micro-yield stresses for samples S1, S2, S3 and S4 (P=0, 350, 500, 1000 μm, respectively). View Within ArticleFig. 13. Intrinsic and apparent micro-yield stress profiles. Measurements made on sample S5. View Within Article Table 1. Chemical composition of the 32CrMoV13 steel investigated View Within ArticleTable 2. Parameters of Eq. (11) where τe and δr are expressed in MPa and er in nm, for different maximum applied loads W. View Within Article Materials Science and Engineering A Volume 342, Issues 1-2, 15 February 2003, Pages 311-319 Home Browse My Settings Alerts Help About ScienceDirect | Contact Us | Terms & Conditions | Privacy Policy Copyright © 2008 Elsevier B.V. All rights reserved. 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