The Low Temperature Impact Behavior and Ductile-Brittle Transition of Nano-cluster-Strengthened Steel

被引:0
作者
Zhang, Caidong [1 ]
Zhang, Yunfei [1 ]
Sun, Zhiyan [1 ]
Ren, Shuai [1 ]
Zhao, Yingli [1 ]
Fu, Lu [2 ]
Zhao, Yan [2 ]
Wu, Yingfei [1 ]
机构
[1] HBIS Mat Technol Res Inst, HBIS Grp, Shijiazhuang 050000, Hebei, Peoples R China
[2] Harbin Engn Univ, Yantai Res Inst, Grad Sch, Yantai 264000, Shandong, Peoples R China
关键词
impact behavior; ductile -brittle transition temperature; nanocluster-strengthened steel; nanoscale precipitates; EFFECTIVE GRAIN-SIZE; MICROSTRUCTURAL PARAMETERS; MECHANICAL-PROPERTIES; TOUGHNESS; PRECIPITATION; REFINEMENT; RESISTANCE; INITIATION; STRAIN; REGION;
D O I
10.2320/matertrans.MT-N2023006
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A series of impact tests within the temperature range of -180320 degrees C were applied to study the low temperature impact behavior and ductile -brittle transition of the 700 MPa nanocluster-strengthened steel. The results clearly demonstrated that temperature had a significant effect on impact properties. As the temperature decreased, the impact absorption energy and shear section ratio were correspondingly reduced, and the micro -morphology was changed gradually from ductile fracture to brittle fracture. The ductile -brittle transition temperature (DBTT) range of was between -80 degrees C and -160 degrees C. The fitting results of the Boltzmann function for the ductile -brittle transition curve were in good agreement with the experimental observations. Specifically, the DBTT was determined to be -110 << 1 degrees C, which suggested good low -temperature impact toughness. The outstanding low -temperature impact toughness of the test steel is mainly due to its low C content and high Ni content, fine effective grain size (EGS), and a large number of Cu -rich nanoscale precipitates. Furthermore, the effect of temperature on dislocation movement plays a major role in the ductile -brittle transition.
引用
收藏
页码:152 / 158
页数:7
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