首页|Effect of short-time low-temperature austenitizing on microstructure and mechanical properties of DT300 ultra-high strength steel fabricated by laser powder bed fusion

Effect of short-time low-temperature austenitizing on microstructure and mechanical properties of DT300 ultra-high strength steel fabricated by laser powder bed fusion

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To address the inhomogeneous microstructure and improve the mechanical properties of DT300 ultra-high strength steel specimens fabricated by laser powder bed fusion,different post-heat treatment schedules are performed.With the increase in austenitizing temperature and time,the migration rate of austenite grain boundaries continuously increases with the dissolution of nano-carbides,and the formation of nano-oxides and twin martensite is also inhibited accordingly.The rapid growth in the size of prior austenite grains and martensite laths,as well as the decrease in the content of nano-oxides and twin martensite,led to a rapid decrease in the strength(yield strength and ultimate tensile strength)from HT2 to HTF specimens.The HT1 specimens(austenitizing at 830 ℃ for 30 min,then oil quenching and tempering at 300 ℃ for 120 min and finally air cooling)display excellent mechanical properties of yield strength of 1572 MPa,ultimate tensile strength of 1847 MPa,elongation of 9.84％,and fracture toughness of 106 MPa m1/2,which are counterparts to those of conventional DT300 steel forgings after heat treatment.

DT300 ultra-high strength steelLaser powder bed fusionShort-time low-temperature austenitizingMicrostructureMechanical property

Chen-yang Jiang、Xiao-qiang Li、Jin-tao Wang、Hao Luo、Sheng-qing Gao、Sheng-guan Qu、Chao Yang

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National Engineering Research Centre of Near-Net-Shape Forming for Metallic Materials,South China University of Technology,Guangzhou 510640,Guangdong,China

Institute of New Materials,Guangdong Academy of Science,Guangzhou 510650,Guangdong,China

Science and Technology Project of Guangdong ProvinceGuangdong Basic and Applied Basic Research FoundationFundamental Research Funds for the Central Universities

2020B0909230012023A15150103842023ZYGXZR005

2024

10.1007/s42243-024-01206-5

钢铁研究学报(英文版)
钢铁研究总院

钢铁研究学报(英文版)

CSTPCD
影响因子：0.584
ISSN：1006-706X
年,卷(期)：2024.31(7)