scholarly journals In situ Solidified Hot Tensile Test and Hot Ductility of Some Plain Carbon Steels and Microalloyed Steels.

1994 ◽  
Vol 34 (6) ◽  
pp. 528-535 ◽  
Author(s):  
Thierry Revaux ◽  
Pascal Deprez ◽  
Jean-Paul Bricout ◽  
Jérôme Oudin
Keyword(s):  
Tensile Test ◽  
Carbon Steels ◽  
Microalloyed Steels ◽  
Hot Ductility

INFLUENCE OF NITROGEN ON HOT DUCTILITY BEHAVIOR OF MEDIUM CARBON MICROALLOYED STEEL

2009 ◽  
Vol 23 (06n07) ◽  
pp. 1122-1128 ◽  
Author(s):  
SUJUAN ZHAO ◽  
QINGFENG WANG ◽  
ZESHENG YAN
Keyword(s):  
Microalloyed Steel ◽  
True Strain ◽  
Tensile Tests ◽  
Microalloyed Steels ◽  
Hot Ductility ◽  
True Strain Rate ◽  
Medium Carbon ◽  
Ductility Trough ◽  
Carbon Microalloyed

The current study aims to estimate the influence of enhanced nitrogen on the hot ductility of medium carbon microalloyed steel. For this purpose, hot tensile tests were carried out at temperatures rangeing from 700°C-1000°C at a true strain rate of 0.001s-1. The fracture surfaces and their neighboring precipitates and matrix microstructures "frozen" in tensile temperatures were observed. The dependence of hot ductility on the fracture mode and in situ microstructural changes were discussed. The results indicate that raising the nitrogen content from 0.003% to 0.014% and 0.021% was found to deteriorate the ductility as the obtained ductility trough became deeper and wider. The trough deepening caused by the addition of nitrogen was due to the formation of film-like ferrite and fine VN precipitation along the austenite grain boundaries promoting low ductility intergranular failure. On the other hand, the retarded dynamic recrystallization, the promoted deformation induced ferrite formation and precipitation at higher temperatures by enhanced nitrogen were regarded as the possible reasons for a wider trough. In summary, the above results indicate the hot ductility of medium carbon microalloyed steels is weakened to some extent by enhanced nitrogen and their windows suitable for continuous casting should be schemed very carefully.

In-situ X-ray tomography investigation of pore damage effects during a tensile test of a Ni-based single crystal superalloy

2021 ◽  
pp. 111180
Author(s):  
Keli Liu ◽  
Junsheng Wang ◽  
Bing Wang ◽  
Pengcheng Mao ◽  
Yanhong Yang ◽  
...  
Keyword(s):  
Tensile Test ◽  
Single Crystal ◽  
Single Crystal Superalloy ◽  
X Ray

scholarly journals Crack Propagation Behavior of a Ni-Based Single-Crystal Superalloy during In Situ SEM Tensile Test at 1000 °C

Crystals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1047
Author(s):  
Wenxiang Jiang ◽  
Xiaoyi Ren ◽  
Jinghao Zhao ◽  
Jianli Zhou ◽  
Jinyao Ma ◽  
...  
Keyword(s):  
Crack Propagation ◽  
Tensile Test ◽  
Single Crystal ◽  
Crack Propagation Rate ◽  
Propagation Rate ◽  
Single Crystal Superalloy ◽  
Propagation Path ◽  
Propagation Behavior ◽  
Crack Propagation Behavior

An in situ scanning electron microscope (SEM) tensile test for Ni-based single-crystal superalloy was carried out at 1000 °C. The stress displacement was obtained, and the yield strength and tensile strength of the superalloy were 699 MPa and 826 MPa, respectively. The crack propagation process, consisting of Model I crack and crystallographic shearing crack, was determined. More interestingly, the crack propagation path and rate affected by eutectics was directly observed and counted. Results show that the coalescence of the primary crack and second microcrack at the interface of a γ/γ′ matrix and eutectics would make the crack propagation rate increase from 0.3 μm/s to 0.4 μm/s. On the other hand, crack deflection decreased the rate to 0.05 μm/s. Moreover, movement of dislocations in front of the crack was also analyzed to explain the different crack propagation behavior in the superalloy.

scholarly journals In situ study of granular micromechanics in semi-solid carbon steels

2013 ◽  
Vol 61 (11) ◽  
pp. 4169-4179 ◽  
Author(s):  
J. Fonseca ◽  
C. O’Sullivan ◽  
T. Nagira ◽  
H. Yasuda ◽  
C.M. Gourlay
Keyword(s):  
Carbon Steels ◽  
Solid Carbon ◽  
In Situ Study ◽  
Granular Micromechanics ◽  
Semi Solid

Laser-Ultrasonics as a Technique to Study Recrystallisation and Grain Growth

2004 ◽  
Vol 467-470 ◽  
pp. 1353-1362 ◽  
Author(s):  
Eva Lindh-Ulmgren ◽  
Mattias Ericsson ◽  
Dorota Artymowicz ◽  
W. Bevis Hutchinson
Keyword(s):  
Carbon Steels ◽  
Laser Ultrasonics ◽  
Continuous Annealing ◽  
Low Carbon ◽  
Steel Sheets ◽  
On Line ◽  
Cold Rolled ◽  
Dynamic Heating ◽  
Good Agreement

Laser-Ultrasonics (LUS) provides a means of obtaining microstructure information continuously and non-destructively both in the laboratory and for quality control on-line in industry. Ultrasound is both generated and recorded using lasers which permits remote, non-contact operation with fast sampling and also the capability of working at high temperatures or at moving surfaces, for example during industrial continuous annealing. Examples of dynamic heating trials will be presented for samples of cold rolled steel sheets where primary recrystallisation and ferrite austenite transformation are monitored in-situ as a function of temperature. Examples are also presented where the grain size of low carbon steels have been quantitatively analysed and show very good agreement with microscopy methods.

scholarly journals Synergetic strengthening of layered steel sheet investigated using an in situ neutron diffraction tensile test

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Jung Gi Kim ◽  
Jae Wung Bae ◽  
Jeong Min Park ◽  
Wanchuck Woo ◽  
Stefanus Harjo ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Tensile Test ◽  
Steel Sheet ◽  
In Situ Neutron Diffraction
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