Influence of Strain Rate on Hot Ductility of a V-Microalloyed Steel Slab

2012 ◽  
Vol 83 (5) ◽  
pp. 445-455 ◽  
Author(s):  
Simon Großeiber ◽  
Sergiu Ilie ◽  
Cecilia Poletti ◽  
Bernhard Harrer ◽  
Hans Peter Degischer
Keyword(s):  
Strain Rate ◽  
Microalloyed Steel ◽  
Hot Ductility ◽  
Steel Slab

scholarly journals Effect of Strain Rate on the Hot Ductility Behavior of a Continuously Cast Ti–Nb Microalloyed Steel

2020 ◽  
Vol 91 (12) ◽  
pp. 2000222
Author(s):  
Marina Gontijo ◽  
Christian Hoflehner ◽  
Paul Estermann ◽  
Sergiu Ilie ◽  
Jakob Six ◽  
...  
Keyword(s):  
Strain Rate ◽  
Microalloyed Steel ◽  
Hot Ductility ◽  
Continuously Cast ◽  
Nb Microalloyed Steel

Effect of Cooling Rate on the Precipitation Behavior of Carbonitride in Microalloyed Steel Slab

2010 ◽  
Vol 42 (1) ◽  
pp. 81-86 ◽  
Author(s):  
Fanjun Ma ◽  
Guanghua Wen ◽  
Ping Tang ◽  
Guodong Xu ◽  
Feng Mei ◽  
...  
Keyword(s):  
Cooling Rate ◽  
Microalloyed Steel ◽  
Precipitation Behavior ◽  
Steel Slab

Effect of Strain Rate on Nb(C,N) Precipitation in Micro Alloy Steel Slab

2012 ◽  
Vol 535-537 ◽  
pp. 633-638 ◽  
Author(s):  
Zheng Hai Zhu ◽  
Sheng Tao Qiu
Keyword(s):  
Continuous Casting ◽  
Strain Rate ◽  
Alloy Steel ◽  
Casting Speed ◽  
Casting Process ◽  
Continuous Casting Process ◽  
Precipitation Model ◽  
Strain And Strain Rate ◽  
Steel Slab

It was analyzed by strain-induced precipitation model that Nb(C,N) precipitation in micro alloy steel slab was effected by strain rate during continuous casting process. The results are as follows: The changing of casting speed could effect the time for 5%precipitation of Nb(C,N), which was decreasing with increasing casting speed at certain temperature and strain rate. Slab strain and strain rate were too small in bending zone and leveling zone. The effect of slab strain rate on Nb(C,N) precipitation could be ignore when Nb(C,N) precipitation in continuous casting process was studied.

Impact of Surface Structure Control Cooling During Continuous Casting on Hot Ductility of Microalloyed Steel

2015 ◽  
Vol 87 (7) ◽  
pp. 871-879 ◽  
Author(s):  
Martin Lückl ◽  
Ozan Caliskanoglu ◽  
Sergiu Ilie ◽  
Jakob Six ◽  
Ernst Kozeschnik
Keyword(s):  
Continuous Casting ◽  
Surface Structure ◽  
Microalloyed Steel ◽  
Hot Ductility ◽  
Structure Control

scholarly journals Hot Ductility of TiNb IF Steel Slab after Hot Torsion Testing

Metals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 752 ◽  
Author(s):  
Konrádyová ◽  
Longauerová ◽  
Jonšta ◽  
Jonšta ◽  
Longauer ◽  
...  
Keyword(s):  
Temperature Cycling ◽  
Hot Ductility ◽  
If Steel ◽  
Cast Slab ◽  
Torsion Testing ◽  
Steel Slab ◽  
Temperature Dependences ◽  
Hot Torsion ◽  
Average Size ◽  
20 Nm

The aim of the work was to evaluate the hot ductility loss in TiNb stabilized IF steel directly from the continuously-cast slab using hot torsion testing (plastometry) in the temperature range 600–1250 °C according to the basic programme, and also after temperature cycling. A good match of the temperature dependences of number of turns to failure (Nf) and intensity of deformation Se was confirmed. In both cases, the existence of three temperature areas with decrease in plasticity to a minimum was confirmed. The two-stage temperature cycling according to the CT1150 and CT900 programmes mostly resulted in a decrease in plasticity compared to the basic programme. The most significant effect of cycling was related to the CT900 programme below the maximum plasticity in the base programme at 850 °C. A less pronounced decrease was observed for CT1150 cycling below the maximum plasticity in the base program at 1050 °C. In the case of CT1150 cycling, more complex particles were observed at the fractures compared with the basic programme, namely carbonitrides of Ti and Nb in combination with oxisulfides respectively, then Ti nitrides with oxisulfides or oxides and, in addition, complex (Fe,Nb)P4, (Ti,Nb)3S4 type particles. Their mean size determined statistically using TEM was much finer, only 20 nm versus 42 nm in the basic programme. Similarly, CT900 cycling revealed finer particles with an average size of 37 nm compared to 105 nm in the basic programme. The observed particles were Al oxides, Ti(N,C) and (Ti,Nb)2S, in contrast to the particles probably of TiFe and FeMnS in the basic programme. The decrease in plasticity corresponded to the finer particles, newly created in the temperature cycling.

scholarly journals Effect of Strain Rate on Hot Ductility of a Duplex Stainless Steel

2019 ◽  
Vol 2019 ◽  
pp. 1-6 ◽  
Author(s):  
Zhenhua Wang ◽  
Wenyuan Ma ◽  
Chengming Wang
Keyword(s):  
Strain Rate ◽  
Hot Forging ◽  
Total Elongation ◽  
Strain Rate Range ◽  
Hot Ductility ◽  
Hot Workability ◽  
Crack Tips ◽  
The Difference ◽  
Edge Cracking ◽  
Reduction In Area

Duplex stainless steels (DSSs) often have bad hot workability. In this study, specimens of 2205 DSS were hot tensioned over a strain rate range from 0.005 s–1 to 50 s–1 to examine the hot ductility. The crack morphology was observed, and the dependence of hot ductility on the strain rate was analyzed. From 0.005 s–1 to 0.5 s–1, both the total elongation and the reduction in area increased with the strain rate. The reduction in area exhibited a small decrease when the strain rate was greater than 0.5 s–1. More than 85% of cracks formed between the ferrite and austenite, and no less than 70% of crack tips propagated between the ferrite and austenite. When the strain rate was increased from 0.005 s–1 to 0.5 s–1, dynamic recrystallization was promoted in the austenite, and the number fraction of low-angle grain boundaries in the ferrite was improved. The higher strain rate reduced the difference between ferrite and austenite in hardness, which improved the hot ductility. For 2205 DDS, the suggested strain rate is 0.5 s–1 and above to avoid surface and edge cracking during hot forging or hot rolling. The findings will be of value for the understanding of hot ductility of DSSs and other dual-phase alloys.

scholarly journals Effects of Sn and Sb on the Hot Ductility of Nb+Ti Microalloyed Steels

Metals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1679
Author(s):  
Chunyu He ◽  
Jianguang Wang ◽  
Yulai Chen ◽  
Wei Yu ◽  
Di Tang
Keyword(s):  
Laser Scanning ◽  
Microalloyed Steel ◽  
Confocal Laser Scanning Microscope ◽  
Microalloyed Steels ◽  
Confocal Laser ◽  
Hot Ductility ◽  
High Temperature Mechanical Properties ◽  
Ductility Trough ◽  
Gleeble 3500 ◽  
Fracture Morphologies

Referencing the composition of a typical Nb+Ti microalloyed steel (Q345B), two kinds of steels, one microalloyed with Sn and Sb, and the other one only microalloyed with Sb were designed to study the effects of Sn and Sb on the hot ductility of Nb+Ti microalloyed steels. The Gleeble-3500 tester was adopted to determine the high-temperature mechanical properties of the two test steels. Fracture morphologies, microstructures and interior precipitation status were analyzed by SEM, CLSM (Confocal laser scanning microscope) and EDS, respectively. Results revealed that within the range of 950–650 °C, there existed the ductility trough for the two steels, which were mainly attributed to the precipitation of TiN and Nb (C, N). Additionally, precipitation of Sn and Sb were not observed in this research and the hot ductility was not affected by the addition of Sn and Sb, as compared with the Nb+Ti microalloyed steel. Therefore, addition of a small amount of Sn and Sb (≤0.05 wt.%) to the Nb+Ti microalloyed steel is favorable due to the improvement on corrosion resistance.

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