Effects of annealing temperature on the microstructure and properties of the 25Mn-3Si-3Al TWIP steel

2009 ◽  
Vol 16 (2) ◽  
pp. 154-158 ◽  
Author(s):  
Zhen-li Mi ◽  
Di Tang ◽  
Hai-tao Jiang ◽  
Yong-juan Dai ◽  
Shen-sheng Li
Keyword(s):  
Annealing Temperature ◽  
Twip Steel ◽  
Microstructure And Properties

Effect of Annealing Temperature on Microstructure and Properties of Surface Nanocrystalline Structure in Low Carbon Steel Specimen

2007 ◽  
Vol 353-358 ◽  
pp. 1601-1604
Author(s):  
Xin Min Fan ◽  
Yan Jiao Ji ◽  
Jie Wen Huang
Keyword(s):  
Surface Layer ◽  
Carbon Steel ◽  
Annealing Temperature ◽  
Low Carbon Steel ◽  
Nanocrystalline Structure ◽  
Low Carbon ◽  
Steel Cylinder ◽  
Surface Nanocrystallization ◽  
Microstructure And Properties ◽  
Average Grain Size

Nanostructure surface layer was fabricated on a low carbon steel cylinder specimen by means of circulation rolling plastic deformation (CRPD), and the effect of annealing temperature on microstructure and properties of surface nanocrystalline structure was studied. The microstructure of the surface layer on the samples was observed by transmission electron microscopy and the microhardness variation along the depth was measured on the cross-sectional samples by using microhardness instrument. After CRPD treatment for 250min, the average grain size was about 10nm in the top surface layer and increased with an increment of the distance from the top surface. The surface nanocrystallization samples were annealed at 200°C, 300, 400°C and 500°C for 30min respectively. The nanocrystallization grain of surface layer did not grow for samples after annealed at 200°C and 300°C. After surface nanocrystallization by CRPD treatment the microhadness of top surface obviously increase from 220HV0.1 to 520HV0.1.

Recrystallisation Behaviour of an Fe-Mn-C-Si-Al TWIP

2012 ◽  
Vol 715-716 ◽  
pp. 649-654 ◽  
Author(s):  
Lieven Bracke ◽  
Nieves Cabañas-Poy
Keyword(s):  
Grain Size ◽  
Cold Rolling ◽  
Annealing Temperature ◽  
Twip Steel ◽  
Rolling Texture ◽  
Annealing Temperatures ◽  
Twip Steels ◽  
Cold Rolled ◽  
Main Components ◽  
Cold Rolling Texture

The static recrystallisation behaviour of cold rolled and annealed TWinning Induced Plasticity (TWIP) steels is important for its industrial production. The recrystallisation kinetics have been determined for an Fe-Mn-C-Si-Al TWIP steel using hardness measurements and microstructure analysis: it has been shown that recrystallisation progresses rapidly with increased annealing temperature. Recrystallisation was faster at higher cold reductions, and a smaller final grain size was observed at lower annealing temperatures. This indicates that the mechanism is nucleation dominated at lower temperatures; grain growth at higher temperatures appears similar for all reductions. The recrystallisation results in a crystallographic texture where the main components of the cold rolling texture are preserved in the final texture after annealing, although some randomisation was observed.

Influence of Annealing Temperature on Microstructure and Properties of the Hot-Stamping Boron Steel

2012 ◽  
Vol 602-604 ◽  
pp. 385-389
Author(s):  
Kuan Hui Hu ◽  
Xiang Dong Liu ◽  
De Xin Tian ◽  
Guan Wen Feng ◽  
Fang Yi Sun
Keyword(s):  
Yield Strength ◽  
Annealing Temperature ◽  
Hot Stamping ◽  
Phase Region ◽  
Boron Steel ◽  
Two Phase ◽  
Microstructure And Properties ◽  
Significant Downward Trend ◽  
Test Steel ◽  
Higher Temperature

The effect of different annealing temperature on microstructure and properties of the hot-stamping boron steel were studied.The results show that the yield strength of the test steel is reduced with increasing annealing temperature, only at 790°C,the specimen yield strength increased slightly, and showed a significant downward trend after 790°C.The specimen tensile strength and hardness with the change of the same trend when annealing temperature changes.And through the test we can see,at 760°C ,the test steel has entered a two-phase region,the test steel gain ferrite and pearlite when it is annealed below the temperature,it is easy to appear martensite microstructure when it is annealed in the higher temperature,and lead to the strength and hardness of the rise.

Influence of Annealing Temperature on Microstructure and Properties of Warm-Rolled AZ31 Magnesium Alloy Sheets

2013 ◽  
Vol 747-748 ◽  
pp. 352-358
Author(s):  
Hua Zhang ◽  
Guang Sheng Huang ◽  
Jin Han Lin ◽  
Li Fei Wang
Keyword(s):  
Magnesium Alloy ◽  
Strain Hardening ◽  
Annealing Temperature ◽  
Az31 Alloy ◽  
Az31 Magnesium Alloy ◽  
Strain Hardening Exponent ◽  
N Value ◽  
Microstructure And Properties ◽  
Different Temperatures ◽  
R Value

Warm-rolled AZ31 alloy sheets were annealed at different temperatures ranging from 150 to 450°C. Effects of annealing temperature on microstructure and properties of warm-rolled AZ31 alloy sheets, especially the formability, were investigated. The results revealed that the Lankford value (r-value) and strain-hardening exponent (n-value) first increased and then became relatively steady with the increase of annealing temperature. The Erichsen value (IE) first increased and then decreased with the increase of annealing temperature and the AZ31 alloy sheets exhibited the highest IE of 3.02 mm when annealing at 250°C, which can be mainly attributed to a larger elongation, a lower r-value and a higher n-value.

Effect of Annealing on the Microstructure and Properties of Drawn Cu-14Fe-0.05C Alloy

2020 ◽  
Vol 996 ◽  
pp. 125-130
Author(s):  
Wei Guo ◽  
De Ping Lu ◽  
Jiang Jiang ◽  
Ke Ming Liu
Keyword(s):  
Electrical Conductivity ◽  
Tensile Strength ◽  
Annealing Time ◽  
Annealing Temperature ◽  
Mechanical Performance ◽  
Melting Process ◽  
Vacuum Melting ◽  
Microstructure And Properties

Cu-14Fe-0.05C alloy was prepared by using the vacuum melting process and then multipass drawing deformation was performed. After that, the alloy in the as-drawn state was annealed. Based on this, the influence of annealing temperature on microstructure, mechanical performance and electrical conductivity of the alloy was studied. The results showed that the speed of recovery and recrystallization of the as-drawn Cu-14Fe-0.05C alloy accelerates and iron-rich fibers gradually become slender, bend and fracture, with the increase of annealing temperature. The tensile strength of the alloy constantly decreases, while elongation continuously rises and resistivity gradually reduces. With the extension of annealing time, tensile strength and resistivity of the Cu-14Fe-0.05C alloy gradually decreases, while elongation gradually increases.

Effect of Different Annealing Process for Microstructure and Properties of 1200MPa HSLA Steel

2015 ◽  
Vol 713-715 ◽  
pp. 2653-2657
Author(s):  
Yu Pei ◽  
Zhe Gao ◽  
Yi Liu ◽  
Shi Qian Zhao ◽  
Chang Yu Xu ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Room Temperature ◽  
Annealing Temperature ◽  
Hsla Steel ◽  
High Strength ◽  
Annealing Process ◽  
Air Cooling ◽  
Low Carbon ◽  
Slow Cooling ◽  
Microstructure And Properties

For C-Si-Mn low carbon HSLA(High Strength Low Alloyed) steel, the influence of microstructure and properties were researched on the different annealing processes. The result showed that the microstructure at room temperature of the steel were polygonal ferrite, island martensite and punctate bainite. With the increase of the annealing temperature, the content of martensite and bainiteincreased and the content of ferrite decreased. Accordingly, tensile strengthincreased from 1069MPa to 1498MPa, and the elongation decreased from 13.8% to 5.1%. With the increase of the overaging temperature, tensile strength decreased from 1315MPa to 1152MPa, and the elongationincreased from8.5% to9.8%. Finally, the optimum annealing process obtained that the annealing temperature was 820°C for 80s, slow cooling to 680°C, water quenching to room temperature, the overaging temperature was 280°C for 300s and air cooling to room temperature. The material obtained higher tensile strength and better elongation.

Effect of Nb Content on Microstructure and Properties of Microalloyed Rephosphorized Steel

2013 ◽  
Vol 820 ◽  
pp. 54-58
Author(s):  
Chun Yu Ma ◽  
Chang Wang ◽  
Jun Ping Yuan ◽  
Hai Chao Wu
Keyword(s):  
Mechanical Properties ◽  
Steel Sheet ◽  
Annealing Temperature ◽  
Coiling Temperature ◽  
Microstructure And Properties ◽  
Coarsening Behavior ◽  
Nb Content ◽  
Hot Rolled

The effects of Nb content on the microstructure and properties of microalloyed rephosphorized steel sheet are investigated by analyzing its microstructure and properties of as hot-rolled and as annealed. The results show that proper coiling temperature for full precipitation increases as Nb content increases. Mechanical properties varies as the annealing temperature increases because of precipitation coarsening behavior, it is bad for mechanical properties stability.

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