IMR OpenIR
Improvement of Strength-Toughness-Hardness Balance in Large Cross-Section 718H Pre-Hardened Mold Steel
Liu, Hanghang1,2; Fu, Paixian1,2; Liu, Hongwei1,2; Li, Dianzhong1,2
Corresponding AuthorFu, Paixian(pxfu@imr.ac.cn) ; Li, Dianzhong(dzli@imr.ac.cn)
2018-04-01
Source PublicationMATERIALS
ISSN1996-1944
Volume11Issue:4Pages:19
AbstractThe strength-toughness combination and hardness uniformity in large cross-section 718H pre-hardened mold steel from a 20 ton ingot were investigated with three different heat treatments for industrial applications. The different microstructures, including tempered martensite, lower bainite, and retained austenite, were obtained at equivalent hardness. The microstructures were characterized by using metallographic observations, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and electron back-scattered diffraction (EBSD). The mechanical properties were compared by tensile, Charpy U-notch impact and hardness uniformity tests at room temperature. The results showed that the test steels after normalizing-quenching-tempering (N-QT) possessed the best strength-toughness combination and hardness uniformity compared with the conventional quenched-tempered (QT) steel. In addition, the test steel after austempering-tempering (A-T) demonstrated the worse hardness uniformity and lower yield strength while possessing relatively higher elongation (17%) compared with the samples after N-QT (14.5%) treatments. The better ductility of A-T steel mainly depended on the amount and morphology of retained austenite and thermal/deformation-induced twined martensite. This work elucidates the mechanisms of microstructure evolution during heat treatments and will highly improve the strength-toughness-hardness trade-off in large cross-section steels.
Keyword718H pre-hardened mold steel heat treatments strength-toughness-hardness microstructure
Funding OrganizationNational Key Research and Development Program of China ; Cooperation Program of Hubei province ; Chinese Academy of Sciences (The Research and Development of Key Technologies for Special Steel of Homogeneous High Performance)
DOI10.3390/ma11040583
Indexed BySCI
Language英语
Funding ProjectNational Key Research and Development Program of China[2016YFB0300401] ; Cooperation Program of Hubei province ; Chinese Academy of Sciences (The Research and Development of Key Technologies for Special Steel of Homogeneous High Performance)
WOS Research AreaMaterials Science
WOS SubjectMaterials Science, Multidisciplinary
WOS IDWOS:000434710200125
PublisherMDPI
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/128261
Collection中国科学院金属研究所
Corresponding AuthorFu, Paixian; Li, Dianzhong
Affiliation1.Chinese Acad Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, 72 Wenhua Rd, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Liu, Hanghang,Fu, Paixian,Liu, Hongwei,et al. Improvement of Strength-Toughness-Hardness Balance in Large Cross-Section 718H Pre-Hardened Mold Steel[J]. MATERIALS,2018,11(4):19.
APA Liu, Hanghang,Fu, Paixian,Liu, Hongwei,&Li, Dianzhong.(2018).Improvement of Strength-Toughness-Hardness Balance in Large Cross-Section 718H Pre-Hardened Mold Steel.MATERIALS,11(4),19.
MLA Liu, Hanghang,et al."Improvement of Strength-Toughness-Hardness Balance in Large Cross-Section 718H Pre-Hardened Mold Steel".MATERIALS 11.4(2018):19.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Liu, Hanghang]'s Articles
[Fu, Paixian]'s Articles
[Liu, Hongwei]'s Articles
Baidu academic
Similar articles in Baidu academic
[Liu, Hanghang]'s Articles
[Fu, Paixian]'s Articles
[Liu, Hongwei]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Liu, Hanghang]'s Articles
[Fu, Paixian]'s Articles
[Liu, Hongwei]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.