Role of laser scan strategies in defect control,microstructural evolution and mechanical properties of steel matrix composites prepared by laser additive manufacturing

作     者：Hong-yu Chen Dong-dong Gu Qing Ge Xin-yu Shi Hong-mei Zhang Rui Wang Han Zhang Konrad Kosiba Hong-yu Chen;Dong-dong Gu;Qing Ge;Xin-yu Shi;Hong-mei Zhang;Rui Wang;Han Zhang;Konrad Kosiba

作者机构：College of Materials Science and TechnologyNanjing University of Aeronautics and AstronauticsNanjing 210016China Jiangsu Provincial Engineering Laboratory for Laser Additive Manufacturing of High-Performance Metallic ComponentsNanjing University of Aeronautics and AstronauticsNanjing 210016China Leibniz IFW DresdenInstitute for Complex MaterialsHelmholtzstr.2001069 DresdenGermany 

出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)

年 卷 期：2021年第28卷第3期

页      面：462-474页

核心收录：

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 0806[工学-冶金工程] 08[工学] 0708[理学-地球物理学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0802[工学-机械工程] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：the National Key Research and Development Program“Additive Manufacturing and Laser Manufacturing”(No.2016YFB1100101) the National Natural Science Foundation of China(No.51735005) the Basic Strengthening Program of Science and Technology(No.2019-JCJQ-JJ-331) the 5th Jiangsu Province 333 High Level Talents Training Project,China(No.BRA2019048) the 15th Batch of“Six Talents Peaks”Innovative Talents Team Program“Laser Precise Additive Manufacturing of Structure-Performance Integrated Lightweight Alloy Components”(No.TD-GDZB-001) and the 2017 Excellent Scientific and Technological Innovation Teams of Universities in Jiangsu“Laser Additive Manufacturing Technologies for Metallic Components”funded by Jiangsu Provincial Department of Education of China(No.51921003).Konrad Kosiba acknowledges the support from DFG under Grant No.KO 5771/1-1 

主　　题：laser additive manufacturing selective laser melting scan strategy defect control mechanical property 

摘      要：Steel matrix composites(SMCs)reinforced with WC particles were fabricated via selective laser melting(SLM)by employing various laser scan strategies.A detailed relationship between the SLM strategies,defect formation,microstructural evolution,and mechanical properties of SMCs was *** laser scan strategies can be manipulated to deliberately alter the thermal history of SMC during SLM ***,the involved thermal cycling,which encompassed multiple layers,strongly affected the processing quality of *** scan sequence combined with interlayer offset and orthogonal stagger mode can effectively eliminate the metallurgical defects and retained austenite within the produced ***,due to large thermal stress,microcracks that were perpendicular to the building direction formed within the *** employing the checkerboard filling(CBF)hatching mode,the thermal stress arising during SLM can be significantly reduced,thus preventing the evolution of interlayer *** compressive properties of fabricated SMCs can be tailored at a high compressive strength(~3031.5 MPa)and fracture strain(~24.8%)by adopting the CBF hatching mode combined with the optimized scan sequence and stagger *** study demonstrates great feasibility in tuning the mechanical properties of SLM-fabricated SMCs without varying the set energy input,e.g.,laser power and scanning speed.