Direct evidence of melting and decomposition of TiC particles in laser powder bed fusion processed 316L-TiC composite  

作　　者：Wengang Zhai Wei Zhou Yuan Yu Sharon Mui Ling Nai 

机构地区：[1]Singapore Centre for 3D Printing,School of Mechanical and Aerospace Engineering,Nanyang Technological University,50 Nanyang Avenue,639798,Singapore [2]Institute of Physics(IA),RWTH Aachen University,Sommerfeldstraße 14,52074 Aachen,Germany [3]Additive Manufacturing Division,Singapore Institute of Manufacturing Technology,5 Cleantech Loop,Cleantech Two Block B,636732,Singapore

出　　处：《Journal of Materials Science & Technology》2024年第31期166-175,共10页材料科学技术(英文版)

摘　　要：Recent advancements have shown the effectiveness of strengthening 316L with TiC particles addition through the laser powder bed fusion(LPBF)process.However,the question remains whether TiC undergoes decomposition into Ti and C atoms,primarily because of the challenges associated with measuring C at low concentrations.In this study,we employed atom probe tomography(APT)to provide evidence of decomposition by observing the presence of Ti and C atoms in the 316L matrix.The fast cooling rate of the LPBF process results in the supersaturation of Ti and C in the 316L matrix.Adding 3 wt%TiC particles increased the yield strength of LPBF-processed 316L from 599 MPa to 832 MPa.The subsequent annealing treatment resulted in the formation of more TiC nanoparticles as a result of precipitation from the supersaturated Ti and C in the 316L matrix.Consequently,the yield strength was further enhanced to 959 MPa after annealing at 700℃ for 1 h.This study marks the first direct demonstration of the decomposition of TiC in metal matrix composites.

关 键 词：Additive manufacturing Metal matrix composite Stainless steel TIC Heat treatment PRECIPITATION 

分 类 号：TG1[金属学及工艺—金属学]