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EFFECT OF STRAIN RATE ON DYNAMIC DEFORMATION BEHAVIOR OF DP780 STEEL
Alternative TitleEFFECT OF STRAIN RATE ON DYNAMIC DEFORMATION BEHAVIOR OF DP780 STEEL
Dong Danyang1; Liu Yang2; Wang Lei2; Su Liangjin1
2013
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume49Issue:2Pages:159-166
AbstractTensile properties and deformation behavior of DP780 steel were studied using servo-hydraulic high-speed material testing machine, SEM and TEM. The effects of strain rate and the mechanism were investigated. The results showed that the strength and ductility of DP780 steel remained almost unchanged as the strain rate increased at strain rates lower than 10(0) s(-1). When the strain rate was over 10(1) s(-1), the strength and the strain-hardening coefficient increased remarkably. Ductility of DP780 steel increased significantly at the strain rates ranging from 3 x 10(1) to 5 x 10(2) s(-1). The deformation resistance increased with increasing the strain rate due to the stronger short range resistance induced by the acceleration of dislocation motion in the ferrite matrix. Increasing strain rate up to 3 x 10(1) s(-1) resulted in a considerable increase of the amount of mobile dislocation, which was the main reason for the increasing uniform elongation and fracture elongation of DP780 steel at the strain rate ranging from 3 x 10(1) to 5 x 10(2) s(-1). Interface of ferrite-martensite in DP780 steel was the main location for pile-up of dislocation, crack initiation and propagation. The ability of inhomogeneous plastic deformation of DP780 steel increased due to the decreasing plastic strain energy difference between the ferrite matrix and ferrite-martensite interface and the consequent delaying initiation and propagation of microvoids at ferrite-martensite interface induced by the increasing work hardening degree of ferrite matrix with the increasing strain rate.
KeywordPLASTIC-DEFORMATION TENSILE BEHAVIOR ALLOY CRYSTALS SHEETS SPEED S(-1) PHASE dual phase steel dynamic load strain rate deformation behavior
Indexed ByCSCD
Language英语
Funding Project[National Natural Science Foundation of China] ; [Specialized Research Fund for the Doctoral Program of Higher Education of China] ; [Fundamental Research Funds for the Central Universities of China]
CSCD IDCSCD:4763033
Citation statistics
Cited Times:15[CSCD]   [CSCD Record]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/156985
Collection中国科学院金属研究所
Affiliation1.东北大学
2.中国科学院金属研究所
Recommended Citation
GB/T 7714
Dong Danyang,Liu Yang,Wang Lei,et al. EFFECT OF STRAIN RATE ON DYNAMIC DEFORMATION BEHAVIOR OF DP780 STEEL[J]. ACTA METALLURGICA SINICA,2013,49(2):159-166.
APA Dong Danyang,Liu Yang,Wang Lei,&Su Liangjin.(2013).EFFECT OF STRAIN RATE ON DYNAMIC DEFORMATION BEHAVIOR OF DP780 STEEL.ACTA METALLURGICA SINICA,49(2),159-166.
MLA Dong Danyang,et al."EFFECT OF STRAIN RATE ON DYNAMIC DEFORMATION BEHAVIOR OF DP780 STEEL".ACTA METALLURGICA SINICA 49.2(2013):159-166.
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