Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 806, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2021.140856
Keywords
H13 die steel; Yttrium; Microstructures; Fracture morphology; Work-hardening behavior
Categories
Funding
- Key Research and Development Program of Jiangxi Province [20192ACB50010, 20192BBEL50016]
- National Natural Science Foundation of China [51704132]
- Longyi Heavy Rare Earths Co. Ltd.
Ask authors/readers for more resources
In this study, the micro-alloying of rare-earth yttrium (Y) was used to improve the fracture behavior and work-hardening ability of H13 die steel by modifying Cr23C6 and VC carbides. The addition of Y led to interruption and sphericalization of Cr23C6 carbides, increased quantity of VC carbides, and higher work-hardening exponent. Fractographic studies showed a transition from cleavage failure to ductile rupture with increasing Y content, but excess Y content resulted in detrimental inclusion clusters in dimples.
In this study, the micro-alloying of rare-earth yttrium (Y) was employed to improve the fracture behavior and work-hardening ability of H13 die steel. The improved work-hardening ability was attributed to modification of Cr23C6 and VC carbides by the addition of Y. The strip-typed Cr23C6 carbides originally distributed along the grain boundary were interrupted and tended to sphemidize with increasing Y content. Compared with 0Y-H13 steel, the quantity of spherical VC carbides significantly increased in 0.013Y-H13 steel. A higher-density dislocations and intensive interaction between precipitates and dislocation led to a higher work-hardening exponent. Additionally, fractographic studies revealed that the fracture mode transition from cleavage failure to ductile rupture with increasing Y content. Moreover, excess Y content (0.044%) resulted in the appearance of inclusion clusters in dimples, which were detrimental to fracture and work-hardening behavior.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available