scholarly journals Mechanical properties of Mg-8Gd-3Y-0.5Zr alloy with bimodal grain size distributions

2017 ◽  
Vol 5 (4) ◽  
pp. 423-429 ◽  
Author(s):  
J.H. He ◽  
L. Jin ◽  
F.H. Wang ◽  
S. Dong ◽  
J. Dong
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Size Distributions ◽  
Grain Size Distributions ◽  
Bimodal Grain Size

scholarly journals Three-Dimensional in situ Reconstructions of Microstructures with Bimodal Grain Size Distributions

2019 ◽  
Vol 25 (S2) ◽  
pp. 370-371
Author(s):  
Ashley Bucsek ◽  
Lee Casalena ◽  
Darren C. Pagan ◽  
Partha P. Paul ◽  
Yuriy Chumlyakov ◽  
...  
Keyword(s):  
Grain Size ◽  
Three Dimensional ◽  
Size Distributions ◽  
Grain Size Distributions ◽  
Bimodal Grain Size

scholarly journals Grain Growth after Intercritical Rolling

2004 ◽  
Vol 467-470 ◽  
pp. 305-310 ◽  
Author(s):  
Roumen H. Petrov ◽  
Leo Kestens ◽  
Kim Verbeken ◽  
Yvan Houbaert
Keyword(s):  
Grain Size ◽  
Size Distributions ◽  
Orientation Microscopy ◽  
Final Rolling Temperature ◽  
Responsible Mechanism ◽  
Grain Size Distributions ◽  
Intercritical Region ◽  
Final Rolling ◽  
Parent Austenite ◽  
Bimodal Grain Size

The distribution of the characteristic texture components between the ferrite grains of different size classes has been studied in a steel with 0.082%C, 1.54% Mn, 0.35% Si, 0.055%Nb and 0.078%V after different rolling schedules with a final rolling temperature above or below Ar3. Microstructures and textures were characterized by means of optical microscopy and orientation microscopy. A strong grain refining effect together with a bimodal grain size distribution was observed in the steel both after final rolling in the intercritical region or in the austenite region, close to the Ar3 d temperature. The differences in grain size were interpreted on the basis of three potentially acting mechanisms: (i) transformation- induced recrystallization, (ii) increased mobility of specific grain boundaries and (iii) fast nucleation of ferrite grains on specific sites of the parent austenite microstructure. The experimental data clearly favoured the third of these assumptions as the responsible mechanism for the observed bimodal grain size distributions.

Microstructures and Mechanical Properties of Magnesium Alloy ZK60 Sheets after Multi-Pass Hot Rolling

2019 ◽  
Vol 794 ◽  
pp. 113-120
Author(s):  
Yeong Maw Hwang ◽  
Yung Lin Wang
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Magnesium Alloy ◽  
Dynamic Recrystallization ◽  
Hot Rolling ◽  
Size Distributions ◽  
Proposed Model ◽  
Grain Size Distributions ◽  
Deform 2D ◽  
Different Thickness

Magnesium alloys have been widely used in automotive, bicycle, aerospace industries. Improving the mechanical properties of the materials by various forming processes has been an important issue. Grain refinement is an effective method to improve material properties. In this study, single-pass and multi-pass hot rolling processes are carried out to generate dynamic recrystallization (DRX) and fine grains and to obtain better mechanical properties on the rolled products. A mathematical model linked with FEM software DEFORM-2D is proposed to predict the dynamic recrystallization ratio and the grain size distributions during various multi-pass hot rolling processes. The effects of different thickness reductions on the grain size distributions inside the sheet are discussed. Multi-pass hot rolling experiments of magnesium alloy ZK60 sheets are carried out and the metallographic microstructures are observed. The measured grain sizes are compared with the simulation results to verify the validity of the proposed model. The effects of different thickness reductions on the mechanical properties of the rolled magnesium alloy ZK60 sheets are also investigated.

Sign in / Sign up

Export Citation Format

Share Document