MODEL OF THE EFFECT OF GRAIN SIZE ON PLASTI-CITY IN ULTRA-FINE GRAIN SIZE STEELS

doi:10.11900/0412.1961.2014.00678

Acta Metall Sin

2015, Vol. 51

Issue (7): 777-783 DOI: 10.11900/0412.1961.2014.00678

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MODEL OF THE EFFECT OF GRAIN SIZE ON PLASTI-CITY IN ULTRA-FINE GRAIN SIZE STEELS

Jin LIU¹,Guohui ZHU^1,²(

)

1 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083
2 School of Metallurgical Engineering, Anhui University of Technology, Maanshan 243000

Cite this article:

Jin LIU,Guohui ZHU. MODEL OF THE EFFECT OF GRAIN SIZE ON PLASTI-CITY IN ULTRA-FINE GRAIN SIZE STEELS. Acta Metall Sin, 2015, 51(7): 777-783.

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Abstract

Based on our earlier preliminary work, a model was developed for prediction of the critical grain size where the plasticity would be decreased as the grain refined. In the model the effect of grain size on the fracture strength was combined. The prediction of the model exhibited that in the range of grain size of 10 mm to 0.2 mm as an example, the total elongation of the steels would be firstly increased. But when the grain size was refined to 2.5 mm and below, the total elongation of the steels was not increased but decreased sharply, which was good agreement with the experimental results published recently. Present work illustrated that the dominant mechanism of the elongation decreased in the ultra-fine grain size materials is due to increase in resistance force of grain boundaries on the dislocation sources resulting in the difficulty of activation of dislocation movements. Its expression would be the decrease of the plastic strain in macro-level.

Key words: plasticity ultrafine grain size grain size dislocation pile-up dislocation source

Fund: Supported by National Natural Science Foundation of China (No.51071026) and Scientific Research Foundation for the Returned Overseas Chinese Scholars, Ministry of Education

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https://www.ams.org.cn/EN/10.11900/0412.1961.2014.00678 OR https://www.ams.org.cn/EN/Y2015/V51/I7/777

Fig.1 Relationship between fracture strength σ_f and grain size d in polycrystalline materials

Fig.2 Schematic of dislocation pile-up group in a single grain (t_d—given applied stress)

Fig.3 Relationship between the displacement of a single grain D^f₀ and d under the corresponding fracture strength

Fig.4 Schematic of grain boundary blocks the process of Frank-Read source (FR source) emits dislocations (Both d_a and d_b represent grain size and d_a>d_b)

Fig.5 Relationship between the probability of activated FR sources in polycrystal F^f and d under the applied stress of 616 MPa, 1946 MPa and the corresponding fracture strength

Fig.6 Relationship between the total fracture elongation e_f and d

Fig.7 Experimental data of uniform elongation e_u or total elongation e_f versus d in ultra-fine grain size steels^{[5,6,9,37~42]} (Solid symbols represent e_u and hollow symbols represent e_f)

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