Study on impact fracture behavior of G18CrMo2-6 steel after tempering

被引:6
作者
Li, Zhenjiang [1 ,2 ]
Liu, Yujing [1 ,2 ]
Zhang, Ruyi [1 ,2 ]
Luo, Chao [1 ,2 ]
Qi, Huiping [1 ,2 ]
机构
[1] Taiyuan Univ Sci & Technol, Sch Mat Sci & Engn, Taiyuan, Peoples R China
[2] Shanxi Key Lab Met Forming Theory & Technol, Taiyuan, Peoples R China
基金
中国国家自然科学基金;
关键词
Low alloy CrMo steel; impact toughness; second phase; fracture;
D O I
10.1177/14644207211008582
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The evolution of microstructure of low alloy CrMo steel has a great influence on the mechanical properties. Three different tempering heat treatment conditions were made on the material, and the influence of the microstructure on the impact toughness under different test temperatures was studied. The type, morphology, size and distribution of the second phase will evolve with the change of tempering temperature and time. Impact energy of all samples increases gradually from the lower shelf to upper shelf with the testing temperature increasing. In the lower shelf, the fracture is controlled by the crack nucleation. In the ductile-to-brittle transition temperature (DBTT) range, the fracture is determined by the size of the initial crack initiating on the second phase. In the upper shelf, the cleavage fracture is controlled by the propagation of the carbide crack into continuous grains, and the critical event for fracture is the plasticity of the matrix. The scattering of impact energy in DBTT range is caused by the uneven distribution and size of the brittle second phase.
引用
收藏
页码:2627 / 2636
页数:10
相关论文
共 24 条
[1]   Physical models for cleavage fracture at various temperatures - Bases for local approach to fracture of HSLA steel [J].
Chen, J. H. .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2008, 486 (1-2) :369-375
[2]   Micromechanism of cleavage fracture at the lower shelf transition temperatures of a C-Mn steel [J].
Chen, J. H. ;
Li, G. ;
Cao, R. ;
Fang, X. Y. .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2010, 527 (18-19) :5044-5054
[3]   FURTHER STUDY ON THE MECHANISM OF CLEAVAGE FRACTURE AT LOW-TEMPERATURES [J].
CHEN, JH ;
YAN, C ;
SUN, J .
ACTA METALLURGICA ET MATERIALIA, 1994, 42 (01) :251-261
[4]   MICROMECHANISM OF THE TRANSITION OF FIBROUS CRACKING TO CLEAVAGE OF C-MN BASE AND WELD STEEL [J].
CHEN, JH ;
WANG, GZ .
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1994, 25 (07) :1381-1390
[5]   STUDY OF MECHANISM OF CLEAVAGE FRACTURE AT LOW-TEMPERATURE [J].
CHEN, JH ;
WANG, GZ .
METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1992, 23 (02) :509-517
[6]   The effects of Nb and Mo addition on transformation and properties in low carbon bainitic steels [J].
Hu, Haijiang ;
Xu, Guang ;
Wang, Li ;
Xue, Zhengliang ;
Zhang, Yulong ;
Liu, Guanghui .
MATERIALS & DESIGN, 2015, 84 :95-99
[7]   Effects of carbide precipitation on the strength and Charpy impact properties of low carbon Mn-Ni-Mo bainitic steels [J].
Im, YR ;
Oh, YJ ;
Lee, BJ ;
Hong, JH ;
Lee, HC .
JOURNAL OF NUCLEAR MATERIALS, 2001, 297 (02) :138-148
[8]   Thermal-induced evolution of secondary phases in Cr-Mo-V low alloy steels [J].
Janovec, J. ;
Svoboda, M. ;
Kroupa, A. ;
Vyrostkovav, A. .
JOURNAL OF MATERIALS SCIENCE, 2006, 41 (11) :3425-3433
[9]   Time-temperature-precipitation diagrams of carbide evolution in low alloy steels [J].
Janovec, J ;
Svoboda, M ;
Vyrostková, A ;
Kroupa, A .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2005, 402 (1-2) :288-293
[10]   Effects of rare earth on microstructure and impact toughness of low alloy Cr-Mo-V steels for hydrogenation reactor vessels [J].
Jiang, Zhonghua ;
Wang, Pei ;
Li, Dianzhong ;
Li, Yiyi .
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY, 2020, 45 :1-14