scholarly journals Improved Criteria for Acceptable Yield Point Elongation in Surface Critical Steels

2007 ◽  
Author(s):  
Dr. David Matlock ◽  
Dr. John Speer
Keyword(s):  
Yield Point ◽  
Yield Point Elongation

Analysis of Orange Peel Defects on Hot-Dip Galvanized High Strength Low Alloy Steel

2014 ◽  
Vol 1004-1005 ◽  
pp. 221-226
Author(s):  
Li Hui Wang ◽  
Di Tang ◽  
Xiang Dong Liu ◽  
Yan Wen Zhang ◽  
Shi Zheng Zhou
Keyword(s):  
Yield Point ◽  
Hsla Steel ◽  
Sheet Steel ◽  
Rolling Direction ◽  
Orange Peel ◽  
High Strength ◽  
Electron Back Scatter Diffraction ◽  
Steel Rolling ◽  
Yield Point Elongation ◽  
Skin Rolling

The surface of hot-dip galvanized high strength low alloy (HSLA) steel easily occurs orange peel in the deformation process. On the other hand, the defects possess a specific directivity and sits at approximately a 45-degree angle to the sheet steel rolling direction. The microstructures and properties of steel specimens with the orange peel defects and the normal were analyzed, which results showed that their microstructures consist of ferrite and few granular pearlite. The yield point elongation of the HSLA steel resulted in the orange peel defects on the surface of sheet stamping and it is associated with skin rolling and stretch rolling process. Further studied on the fine microstructures by means of SEM and electron back scatter diffraction (EBSD) techniques, which was apparent for the defect steel that the orange peel defects were resulted from weak favorable {111} texture might be the key factors aggravating the formation of orange peel defects. It can be concluded that the formation of Cottrell atmospheres caused the yield point elongation by the interaction between dislocation and diffusive solute atoms as basic reason and the directivity of the orange peel defects was related with the LUDERS slip forming. The yield point elongation can be eliminated to avoid the orange peel defects beyond to 1.8% skin-rolling and stretch rolling method with an appropriate annealing technology.

The influence of microstructural characteristics on yield point elongation phenomenon in Fe-0.2C-11Mn-2Al steel

2019 ◽  
Vol 739 ◽  
pp. 17-25 ◽  
Author(s):  
Z.H. Cai ◽  
S.Y. Jing ◽  
H.Y. Li ◽  
K.M. Zhang ◽  
R.D.K. Misra ◽  
...  
Keyword(s):  
Yield Point ◽  
Microstructural Characteristics ◽  
Yield Point Elongation

Yield point elongation in fine-grained titanium

2013 ◽  
Vol 96 ◽  
pp. 1-4 ◽  
Author(s):  
Zhiming Li ◽  
Liming Fu ◽  
Bin Fu ◽  
Aidang Shan
Keyword(s):  
Yield Point ◽  
Fine Grained ◽  
Yield Point Elongation

Influence of the Forming Operations on the Yield Stress Measured on Pipe

2010 ◽  
Author(s):  
Philippe Thibaux ◽  
Filip Van den Abeele
Keyword(s):  
Yield Stress ◽  
Yield Point ◽  
Kinematic Hardening ◽  
Base Material ◽  
Ring Expansion ◽  
Processing Route ◽  
Pipe Production ◽  
Good Correspondence ◽  
Data Set ◽  
Yield Point Elongation

The yield stress of pipes is measured among purposes to assess the resistance of the pipe to the internal pressure of the fluid. Unfortunately, it is not possible to sample a straight specimen in the hoop direction, and therefore the pipe has to be flattened prior to testing. In the present investigation, different materials were tested in tensile–compression mode in order to provide data for a kinematic hardening model. Based on this experimental data set, a model was built to take into account several features of the material behaviour (presence of yield point elongation, strain hardening, etc…) and the processing route (longitudinal or spiral seam weld, expander, hydrotest…). Pipe production was also sampled at different moments (base material, after leveling, after pipe forming, after hydrotest). The testing program included tensile testing and ring expansion tests. The results show that the model gives a prediction in good correspondence with the experimental results. The model also reproduces several experimental facts, like for example the presence of a yield point elongation on the base material and its absence on the flattened pipe sample. Finally, the model is compared with an industrial database containing different steel grades (from grade B to X80) and different ratios of wall thickness over diameter (t/OD) ratios. The difference of yield stress between coil and pipe is predicted on this database with an accuracy of 20MPa.

Yield Point Elongation in Al-Mg Alloys

2000 ◽  
Vol 331-337 ◽  
pp. 1303-1308 ◽  
Author(s):  
Hirosuke Inagaki ◽  
Toshio Komatsubara
Keyword(s):  
Yield Point ◽  
Mg Alloys ◽  
Yield Point Elongation ◽  
Al Mg Alloys

Yield point elongation due to twinning in a magnesium alloy

2012 ◽  
Vol 60 (4) ◽  
pp. 1433-1443 ◽  
Author(s):  
Matthew R. Barnett ◽  
Mark D. Nave ◽  
Alireza Ghaderi
Keyword(s):  
Magnesium Alloy ◽  
Yield Point ◽  
Yield Point Elongation
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