Distribution of Mo at Grain Boundary of 1300MPa CrMo Steel

2005 ◽  
Vol 475-479 ◽  
pp. 109-112
Author(s):  
W.G. Yang ◽  
L.N. Zhang ◽  
X. Zhang ◽  
W.J. Hui
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Fracture Resistance ◽  
High Strength ◽  
Average Content ◽  
Delayed Fracture ◽  
Bonding Force ◽  
Research Results ◽  
Mapping Analysis ◽  
Crmo Steel

TEM, EDS and STEM were used to investigate distribution of Mo element in new CrMo steel ADF1 which is applied to 1300MPa high strength bolts with superior delayed fracture resistance. Research results reveal that Mo easily concentrates at grain boundaries. According to refined EDS point and mapping analysis, the region of Mo segregation at grain boundary is about several nanometers wide, and distribution of Mo along the grain boundary is not uniform. The average content of Mo at grain boundary is about double of that in grain area. Concentration of Mo can increase the bonding force of grain boundary, and this is of advantage to the improvement of strength and delayed fracture resistance of the new CrMo steel.

Development of Plastic Region Tightening 1.6-GPa Ultra-High Strength Bolt with High Delayed Fracture Resistance

2019 ◽  
Author(s):  
Takahiro Hamada ◽  
Daisuke Kobayashi ◽  
Mitsushi Oyanagi ◽  
Takashi Tanabe ◽  
Tomohiro Ando ◽  
...  
Keyword(s):  
Fracture Resistance ◽  
Plastic Region ◽  
High Strength ◽  
Delayed Fracture ◽  
High Strength Bolt

Transverse Mechanical Behavior of High-Strength Monocarbide Eutectics

1981 ◽  
Vol 12 ◽  
Author(s):  
M.F.X. Gigliotti ◽  
M. R. Jackson ◽  
S. W. Yang ◽  
M. F. Henry ◽  
D. A. Woodford
Keyword(s):  
Mechanical Behavior ◽  
Grain Boundaries ◽  
Fracture Resistance ◽  
High Strength ◽  
Growth Axis ◽  
The Matrix ◽  
Solidification Processes ◽  
Eutectic Systems

Superalloy eutectics strengthened with monocarbide whiskers are highly anisotropic in strength. Mechanical behavior transverse to the growth axis is governed largely by the fracture resistance of the matrix grain boundaries. While the matrices of these eutectics are essentially columnar grained superalloys, there are significant differences between d.s. superalloys and superalloy-monocarbide eutectics. These differences arise, in part from different solidification processes and from the alloying limitations in eutectic systems.

Caliber-rolled TWIP steel for high-strength wire rods with enhanced hydrogen-delayed fracture resistance

2012 ◽  
Vol 67 (7-8) ◽  
pp. 681-684 ◽  
Author(s):  
Young Soo Chun ◽  
Junmo Lee ◽  
Chul Min Bae ◽  
Kyung-Tae Park ◽  
Chong Soo Lee
Keyword(s):  
Fracture Resistance ◽  
Twip Steel ◽  
High Strength ◽  
Delayed Fracture

Structure, mechanical properties and delayed fracture resistance of welded joints in VS-4 high strength steel

1989 ◽  
Vol 3 (1) ◽  
pp. 12-15
Author(s):  
V F Musiyachenko ◽  
L I Mikhodui ◽  
S L Zhdanov ◽  
Yu M Lebedev ◽  
L P Kravchenko
Keyword(s):  
Mechanical Properties ◽  
Welded Joints ◽  
High Strength Steel ◽  
Fracture Resistance ◽  
High Strength ◽  
Delayed Fracture

Effect of Vanadium on Delayed Fracture Resistance of High Strength Pre-Stressed Concrete Steel Bar

2013 ◽  
Vol 634-638 ◽  
pp. 1708-1711
Author(s):  
Gui Zhi Xiao ◽  
Qing Juan Wang ◽  
Yu Hua Pang
Keyword(s):  
Fracture Resistance ◽  
High Strength ◽  
Optical Microscope ◽  
Vanadium Content ◽  
Sustained Load ◽  
Austenite Grain Size ◽  
Delayed Fracture ◽  
Size Refinement ◽  
Steel Bar ◽  
Carbide Particles

The delayed fracture resistance of pre-stressed concrete (PC) steel bar with different vanadium contents was investigated by using tensile sustained load delayed fracture test and optical microscope. The experimental results show that delayed fracture resistance of vanadium containing steels is higher than that of conventional steel 30MnSi at the same strength level and it increases with the increase of vanadium content. The improvement is resulted mainly from the irreversible traps for hydrogen and the prior austenite grain size refinement by vanadium carbide particles.

Effect of Nb on Delayed Fracture Resistance of Ultra-High Strength Martensitic Steels

2016 ◽  
pp. 541-547
Author(s):  
Rongjie Song ◽  
Nina Fonstein ◽  
Narayan Pottore ◽  
Hyun Jo Jun ◽  
Debanshu Bhattacharya ◽  
...  
Keyword(s):  
Fracture Resistance ◽  
High Strength ◽  
Martensitic Steels ◽  
Delayed Fracture

scholarly journals The shear response of copper bicrystals with Σ11 symmetric and asymmetric tilt grain boundaries by molecular dynamics simulation

Nanoscale ◽  
2015 ◽  
Vol 7 (16) ◽  
pp. 7224-7233 ◽  
Author(s):  
Liang Zhang ◽  
Cheng Lu ◽  
Kiet Tieu ◽  
Xing Zhao ◽  
Linqing Pei
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Grain Boundary ◽  
Grain Boundaries ◽  
Shear Deformation ◽  
High Strength ◽  
Stacking Fault ◽  
Boundary Plane ◽  
Dynamics Simulation ◽  
Grain Boundary Plane

The dissociated stacking fault from the grain boundary plane can increase ductility while retaining the high strength of the Cu bicrystal model under shear deformation.

Delayed Fracture Resistance of 30MnSi High Strength Steel

2012 ◽  
Vol 174-177 ◽  
pp. 223-227
Author(s):  
Shuang Ping Lin ◽  
Yan Zhang ◽  
Mei Guang Fan ◽  
Ben Rong Sun
Keyword(s):  
Heat Treatment ◽  
High Strength Steel ◽  
Fracture Resistance ◽  
High Strength ◽  
Heat Treatments ◽  
Temperature Quenching ◽  
Quenching Temperature ◽  
Delayed Fracture ◽  
Steel Bars ◽  
Marked Drop

To investigate the effect of heat treatment on delayed fracture resistance of high strength steel, 30MnSi steel bars with different heat-treatments are produced. Tensile results showed that, the annealing and sub-temperature quenching steel bars have good delayed fracture resistance and satisfy the criteria that delayed fracture does not occur in 200 h, but there is a marked drop in delayed fracture resistance when the quenching temperature is higher than sub-temperature quenching

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