The combined influence of grain size distribution and dislocation density on hardness of interstitial free steel

作     者：Wei Li Martina Vittorietti Geurt Jongbloed Jilt Sietsma Wei Li;Martina Vittorietti;Geurt Jongbloed;Jilt Sietsma

作者机构：Department of Materials Science and EngineeringDelft University of TechnologyMekelweg 22628 CDDelftthe Netherlands Department of Applied MathematicsDelft University of TechnologyVan Mourik Broekmanweg 62628 XEDelftthe Netherlands Materials Innovation Institute(M2i)Van der Burghweg 1.2628 CSDelftthe Netherlands 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2020年第42卷第10期

页      面：35-43页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：carried out under project number S41.5.14547a in the framework of the Partnership Program of the Materials Innovation Institute M2i(www.m2i.nl) the Technology Foundation TTW(www.stw.nl) which is part of the Netherlands Organization for Scientific Research(www.nwo.nl) 

主　　题：Interstitial free steel Hardness Grain size distribution Dislocation density 

摘      要：Understanding the relationship between microstructure features and mechanical properties is of great significance for the improvement and specific adjustment of steel *** relationship between mean grain size and yield strength is established by the well-known Hall-Petch *** due to the complexity of the grain configuration within materials,considering only the mean value is unlikely to give a complete representation of the mechanical *** classical Taylor equation is often used to account for the effect of dislocation density,but not thoroughly tested in combination with grain size *** the present study,systematic heat treatment routes and cold rolling followed by annealing are designed for interstitial free(IF)steel to achieve ferritic microstructures that not only vary in mean grain size,but also in grain size distribution and in dislocation density,a combination that is rarely studied in the *** microscopy is applied to determine the grain size *** dislocation density is determined through XRD *** hardness is analyzed on its relation with the mean grain size,as well as with the grain size distribution and the dislocation *** the help of the variable selection tool LASSO,it is shown that dislocation density,mean grain size and kurtosis of grain size distribution are the three features which most strongly affect hardness of IF steel.