Print Email Facebook Twitter Surface profile Simulation and Revealing the Factors in the Microstructure that Influence the Surface Title Surface profile Simulation and Revealing the Factors in the Microstructure that Influence the Surface Author Hou, J. Contributor Sietsma, J. (mentor) Faculty Mechanical, Maritime and Materials Engineering Department Materials Science and Engineering Date 2017-01-26 Abstract Interstitial free (IF) steel is widely used in the automobile industry for car outer panel because of its good formability. Recently automotive industry pays more attention to paint appearance, and therefore demands good waviness performance of sheet steels after stamping. This thesis aims to study the factors in the microstructure that influence the surface waviness after plastic deformation. In this study, two kinds of IF steel sheets with similar chemical composition but with different surface waviness after the deformation have been used. One has the desirable surface waviness. The other one which has a larger surface waviness shows wavy pattern after painting the deformed material. The waviness behavior of the materials is simulated by a plane strain tension using the DAMASK software. Virtual specimens based on the 2D EBSD data are used to study the material locally by correlating the simulated surface profile and the EBSD microstructure. Further, artificially created virtual specimens are used to reveal the influence of grain size, texture and spatial distribution of texture on the surface waviness. In addition, the Fourier image analysis technique is also used to study the banding behavior of the IF steel. The results show that the spatial distribution of texture plays a very important role in affecting the waviness. The analysis also indicates that a smaller grain size leads to lower surface waviness after deformation. Reducing the contrast of Taylor factor between neighboring grains shows the similar effect. The aggregation of soft grains surrounded by the hard matrix may be the reason to the large valley appears in the surface profile. Subject DAMASKEBSDFourier image analysissurface wavinessTaylor factor To reference this document use: http://resolver.tudelft.nl/uuid:f4a4d6ad-170f-4ce6-92f3-8a3144f2a67c Embargo date 2022-01-26 Part of collection Student theses Document type master thesis Rights (c) 2017 Hou, J. Files PDF Master Thesis Jiefu Hou.pdf 5.3 MB Close viewer /islandora/object/uuid:f4a4d6ad-170f-4ce6-92f3-8a3144f2a67c/datastream/OBJ/view