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第十届中国钢铁年会暨第六届宝钢学术年会

作者： Liu Qingdong Gu Jianfeng Li Chuanwei Han Lizhan Institute of Materials Modification and Modelling School of Materials Science and EngineeringShanghai Jiaotong University

The austenite reversion in a Cu-containing 3.5wt.% Ni high-strength low-alloy（HSLA） steel with intercritical heat treatment was investigated by electron back-scatter diffraction（EBSD）, transmission electron microscopy（TEM） and atom probe tomography（APT）. It was found that the reverted austenite was formed predominantly located at prior austenite grain boundaries（PAGBs）, martensite packet or block boundaries and martensite lath boundaries（LBs） during intercritical tempering at 675℃ for 1 h. The reverted austenite was rich in austenite stabilizers Ni, Mn, Cu and C. Cu-rich precipitates were also detected by TEM distributed at PAGBs and martensite LBs as well as in ferritic matrix. C-rich precipitates, which were simultaneously enriched with austenite stabilizers Ni and carbide formers Cr and Mo, were found by APT. Since austenite reversion and formation of alloyed carbides are both triggered by initial C segregation, there is a competitive diffusion of austenite stabilizers and carbide formers during the further proceeding of austenite reversion and carbide precipitation, leading to the formation of paraequilibrium C-rich precipitates. On the other hand, Cu precipitation is greatly associated with the clustering and segregation of austenite stabilizers Ni and certainly Cu, which inevitably induces a competitive diffusion of the related atoms in participating in austenite reversion and Cu precipitation. As a result, no Cu-rich precipitates are detected in and around the reverted austenite.

关键词： reverted austenite Cu-rich precipitate C-rich precipitate intercritical tempering atom probe tomography high-strength low-alloy steel

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2.47 GPa grade ultra-strong 15Co-12Ni secondary hardening steel with superior ductility and fracture toughness

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Journal of Materials Science & Technology 2021年第7期66卷 36-45页

作者： Young-Kyun Kim Kyu-Sik Kim Young-Beum Song Jung Hyo Park Kee-Ahn Lee Department of Materials Science and Engineering Inha UniversityIncheon22212Republic of Korea Agency for Defense Development(ADD) Yuseong-guDaegeon34186Republic of Korea

This study investigated the effect of multi-step heat treatment on the microstructure, mechanical properties and fracture behavior of thick 15 Co-12 Ni secondary hardening steel. As-quenched sample was found to have elongated prior austenite grain(PAG) and coarse lenticular martensitic structure. On the other hand, heat-treated sample was observed to have fine lenticular martensitic structure due to fine PAG size and a lot of nano-sized carbides. Also, after heat treatment, nano-scale reverted austenite film was formed at the martensite interfaces. The heat-treated sample showed 2.47 GPa superior tensile strength and superior elongation of about 12 %. The high strength was mainly due to fine block size and high number density of nano-sized carbides. The average value of plane strain fracture toughness(KIC) was 29.3 MPa m1/2, which indicated a good fracture toughness even with the high tensile strength. The tensile fracture surface was observed to have ductile fracture mode(cup-and-cone) and the formation of about ~1 μm ultra-fine dimples. In addition to this, nano-sized carbides were observed within the *** findings suggested that the nano-sized carbide had a positive effect not only on the strength but also on the ductility of the alloy. The fractured surface after toughness test, also showed ductile fracture mode with a lot of dimples. Based on the above results, correlation among microstructural evolution,deformation and fracture mechanisms along the heat-treatment was also discussed.

关键词： Ultra-high strength High Co-Ni secondary hardening steel Microstructure Tensile properties Fracture toughness reverted austenite

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