Effect of microstructure evolution on impact toughness in advanced ultra-high strength steel

被引：1
|
作者：
He, Shuai [1 ,2 ]
Li, Zhifeng [3 ]
Liu, Xin [1 ,2 ]
Liu, Xuming [1 ,2 ]
Wang, Chaoyi [1 ,2 ]
Zhang, Chi [4 ]
Wang, Junsheng [1 ,2 ]
机构：
[1] State Key Lab Met Mat Marine Equipment & Applicat, Anshan 114009, Liaoning, Peoples R China
[2] Ansteel Beijing Res Inst Co Ltd, Beijing 102200, Peoples R China
[3] China Iron & Steel Res Inst Grp, Beijing 100081, Peoples R China
[4] Tsinghua Univ, Minist Educ, Sch Mat Sci & Engn, Key Lab Adv Mat, Beijing 100084, Peoples R China
来源：
MATERIALS LETTERS | 2024年 / 372卷
关键词：
Mechanical properties; Microstructure; Grain boundaries; Charpy impact energy; GND; MARTENSITE;
D O I：
10.1016/j.matlet.2024.137086
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The microstructure evolution and strength-toughness matching relationship of advanced ultra-high strength steel were studied under the tempering temperature range of 200-400 degrees C. The Charpy impact absorption energy of Unotch and V-notch focused on the crack initiation and crack propagation processes, respectively. The peak impact absorption energy of the U-notch appeared at 300 degrees C due to reduced stress concentration from low GND (Geometrically Necessary Dislocations) density. The optimal mechanical properties were found after tempering at 250 degrees C, where martensitic blocks hindered crack propagation, resulting in the peak impact energy of V-notch.
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页数：4
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