scholarly journals Effect of Ti(C, N) Particle on the Impact Toughness of B-Microalloyed Steel

Metals ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 868 ◽  
Author(s):  
Yu Huang ◽  
Guo-Guang Cheng ◽  
Shi-Jian Li ◽  
Wei-Xing Dai ◽  
You Xie
Keyword(s):  
Impact Toughness ◽  
Microalloyed Steel ◽  
Fracture Initiation ◽  
Sem Analysis ◽  
Number Density ◽  
Size Number ◽  
Microalloying Elements ◽  
The Impact ◽  
Ti Content ◽  
Scanning Electron

Simultaneously improving the toughness and strength of B-microalloyed steel by adding microalloying elements (Nb, V, Ti) has been an extensively usedmethod for researchers. However, coarse Ti(C, N) particle will precipitate during solidification with inappropriate Ti content addition, resulting in poor impact toughness. The effect of the size, number density, and location of Ti(C, N) particle on the impact toughness of B-microalloyed steel with various Ti/N ratios was investigated. Coarse Ti(C, N) particles were investigated to act as the cleavage fracture initiation sites, by using scanning electron microscopy (SEM) analysis. When more coarse Ti(C, N) inclusions were located in ferrite instead of pearlite, the impact toughness of steel with ferrite–pearlite microstructure was lower. Meanwhile, when the size or the number density of Ti(C, N) inclusions was larger, the impact toughness was adversely affected. Normalizing treatment helps to improve the impact property of B-microalloyed steel, owing to the location of Ti(C, N) particles being partly changed from ferrite to pearlite. The formation mechanism of coarse Ti(C, N) particles was calculated by the thermodynamic software Factsage 7.1 and Thermo-Calc. The Ti(C, N) particles formed during the solidification of molten steel, and the N-rich Ti(C, N) phase precipitated first and, then, followed by the C-rich Ti(C, N) phase. Decreasing the Ti and N content is an effective way to inhibit the formation of coarse Ti(C, N) inclusions.

Effect of transformation texture on the impact toughness of hot-rolled Ti + Nb microalloyed steel

2017 ◽  
Vol 128 ◽  
pp. 86-97 ◽  
Author(s):  
K.N. Sasidhar ◽  
T. Dhande ◽  
N. Javed ◽  
A. Ghosh ◽  
M. Mukherjee ◽  
...  
Keyword(s):  
Impact Toughness ◽  
Microalloyed Steel ◽  
Transformation Texture ◽  
Nb Microalloyed Steel ◽  
Hot Rolled ◽  
The Impact

Effect of Re-Ti compound modification on the microstructure and mechanical properties of Cr12mov steel

2020 ◽  
pp. 002072091989756
Author(s):  
Sijing Fu ◽  
Binghua Jiang ◽  
Jing Wang ◽  
Hong Cheng
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Impact Toughness ◽  
Optical Microscope ◽  
Test Machine ◽  
Impact Tester ◽  
Near Net Shape ◽  
The Impact ◽  
Compound Modification ◽  
Ti Content

In this paper, near net shape casting technology was used to manufacture Cr12MoV steel die modified using RE-Ti. The samples with different RE(rare earth)-Ti content were fabricated by using the induction furnace. The microstructure of the samples was analyzed by using optical microscope and scanning electron microscope. Electronic universal tensile test machine, pendulum impact tester and rockwell apparatus were utilized to test the mechanical properties of the samples. The results show that after RE-Ti compound modification, the distribution and morphology of carbide are improved, and with the Ti increase, the impact toughness significantly increases, and tensile strength has a slight increase, but hardness is almost unchanged. When Ti content is 0.6%, the impact toughness and tensile strength are 14.9 J/cm2 and 634 MPa, respectively, reaching or approaching to the mechanical properties of the forged Cr12MoV steel.

Effect of Grain Size and Meso-Texture on the Impact Toughness of Ti-Microalloyed Steel

2011 ◽  
Vol 702-703 ◽  
pp. 766-769 ◽  
Author(s):  
A. Ray ◽  
Debalay Chakrabarti
Keyword(s):  
Particle Size ◽  
Grain Size ◽  
Impact Toughness ◽  
Microalloyed Steel ◽  
Charpy Impact ◽  
Impact Testing ◽  
Grain Sizes ◽  
Matrix Strength ◽  
Charpy Impact Testing ◽  
The Impact

Charpy impact testing (over the transition temperature rage) on different samples of a Ti-microalloyed steel, having the same average-TiN particle size but different average-ferrite grain sizes, showed that in spite of the presence of large TiN cuboides, ferrite grain refinement can significantly improve the impact toughness, provided the meso-texture (i.e. the intensity of low-angle boundaries) and matrix strength can be restricted to low values.

scholarly journals On the Determining Role of Texture in Causing Delamination During Impact Fracture of Ti and Nb-Ti Microalloyed Steel

2019 ◽  
Author(s):  
Mingyu Sun ◽  
Xuemin Wang ◽  
R.D.K. Misra
Keyword(s):  
Impact Toughness ◽  
Fracture Surface ◽  
Impact Energy ◽  
Cleavage Fracture ◽  
Microalloyed Steel ◽  
Microalloyed Steels ◽  
Brittle Transition ◽  
High Toughness ◽  
The Impact

700 MPa grade Ti and Nb-Ti microalloyed steels produced by thermo-mechanical control rolled processes (TMCP) were studied to elucidate texture that contributes to delamination and consequent impact toughness. The microstructure of Ti and Nb-Ti steels consisted of ferrite and bainite. Compared with Ti steel, Nb-Ti steel was characterized by a microstructure with finer ferrite and more bainite. The results from tensile and impact tests indicated that there is insignificant change in tensile properties, but toughness was greater in Nb-Ti steel compared with Ti steel. More severe delamination in Nb-Ti steel is attributed to stronger α-fiber (RD ||<110>) texture than Ti steel, especially {100}<110>, {113}<110> and {112}<110> texture. Typical cleavage river patterns were not observed on delaminated fracture surface, instead the cleavage fracture surface indicated some dimples. Interestingly, the impact energy of samples with delamination was greater than samples without delamination in the ductile–brittle transition region. The study suggests that delamination in the ductile–brittle transition zone may also be representative of high toughness.

scholarly journals The influence of the oxygen equivalent in a gas-mixture on the structure and toughness of microalloyed steel weldments

2006 ◽  
Vol 71 (3) ◽  
pp. 313-321 ◽  
Author(s):  
Radica Prokic-Cvetkovic ◽  
Andjelka Milosavljevic ◽  
Aleksandar Sedmak ◽  
Olivera Popovic
Keyword(s):  
Impact Toughness ◽  
Crack Propagation ◽  
Weld Metal ◽  
Acicular Ferrite ◽  
Microalloyed Steel ◽  
Gas Mixtures ◽  
Gas Mixture ◽  
Weld Metals ◽  
Maximum Crack ◽  
The Impact

Testing were carried out on two steels. The first was microalloyed with Nb and second with Ti, Nb and V. The impact toughness of weld metals of these steels was evaluated using an instrumented Charpy pendulum. Five different gas mixtures (Ar, CO2, O2) were used to determine the optimal gas shielded metal arc process for both steels. The oxygen equivalent was used as a representative parameter of a mixture to follow, in particularly, its effect on the microstructure, toughness and crack propagation energy of the weld metal. For these investigated steels, the optimum gas mixture was established (5%CO2, 0.91%O2, balance Ar), which provided the maximum crack propagation energy, due to the microstructure which consisted dominantly of acicular ferrite.

Effects of RE on Microstructure and Mechanical Properties of Low-Alloy Steel

2012 ◽  
Vol 557-559 ◽  
pp. 96-99
Author(s):  
Xiao Liu ◽  
Zhi Hui Li
Keyword(s):  
Mechanical Properties ◽  
Rare Earth ◽  
Electron Microscope ◽  
Impact Toughness ◽  
Earth Element ◽  
Impact Test ◽  
Low Alloy Steel ◽  
Metallographic Examination ◽  
The Impact ◽  
Scanning Electron

The effect of rare earth element on structure and mechanical properties of SS400 steel were studied by metallographic examination, scanning electron microscope (SEM), tensile test and impact test. The results show that rare earth can refine microstructure of SS400 steel. Fracture is changed from cleavage to ductile fracture by adding RE to SS400 steel. And the mechanical properties of SS400 are improved. The impact toughness value of SS400 steel (containing 0.02 RE) increases by 39.66% at -40°C, and at 0°C the impact toughness value increases by 31.05%, respectively comparing with that of steel without RE.

Evaluation of Temperature Influence on Tensile Strength and Izod Impact Resistance on Poly Methyl Methacrylate (PMMA)

2020 ◽  
Vol 1012 ◽  
pp. 100-105
Author(s):  
Gilmar Cunha da Silva ◽  
Foluke Salgado de Assis ◽  
Sergio Neves Monteiro ◽  
Verônica Scarpini Candido ◽  
Alisson Clay Rios da Silva
Keyword(s):  
Methyl Methacrylate ◽  
Impact Resistance ◽  
Sem Analysis ◽  
Temperature Influence ◽  
Tempered Glass ◽  
Poly Methyl Methacrylate ◽  
Aggressive Environment ◽  
Izod Impact ◽  
The Impact ◽  
Scanning Electron

The increasing use of poly methyl methacrylate (PMMA), often replacing tempered glass, is a consequence of its high rigidity, practicality, lightness and transparency. However, current manufacturing standards in the polymer industry recommend specific tests on these materials. The present study aims to mechanically test the properties of poly methyl methacrylate (PMMA) material under conditions that simulate a much more aggressive environment than usual. Infrared spectroscopy (FTIR), thermogravimetric (TG/DTG) tests, Izod impact tests, and scanning electron microscopy (SEM) analysis were performed. The results showed that poly (methyl methacrylate) (PMMA) maintained its tensile mechanical properties up to 105°C. Regarding the impact tenacity, the temperature negatively influenced the performance of this polymer.

Development of New Microalloyed Steel by Alloying with Tungsten

2014 ◽  
Vol 716-717 ◽  
pp. 48-51
Author(s):  
Jing Wei Zhao ◽  
Zheng Yi Jiang
Keyword(s):  
Impact Toughness ◽  
Fracture Strain ◽  
Microalloyed Steel ◽  
Cast Steel ◽  
Casting Process ◽  
Microalloyed Steels ◽  
Positive Role ◽  
Cast Steels ◽  
Impact Energies ◽  
The Impact

The effects of tungsten (W) addition on the microstructure, impact toughness and tensile properties of a microalloyed cast steel were systematically investigated. The results indicate that W alloying in microalloyed cast steel plays a positive role in inhibiting dendrite during casting process, and the yield strength, ultimate tensile strength and fracture strain can be simultaneously improved after W addition. Both microalloyed cast steels with and without W additions show very low impact energies, indicating W addition has no significant effect on the impact toughness. The present work provides a possibility to develop new W-containing microalloyed steels with improved mechanical properties.

scholarly journals Impact Toughness Anisotropy of TA31 Titanium Alloy Cylindrical Shell after Ring Rolling

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4332
Author(s):  
Haiyang Jiang ◽  
Jianyang Zhang ◽  
Bijun Xie ◽  
Zhangxun He ◽  
Hao Zhang ◽  
...  
Keyword(s):  
Cylindrical Shell ◽  
Titanium Alloy ◽  
Electron Microscope ◽  
Impact Toughness ◽  
Scanning Electron Microscope ◽  
Optical Microscope ◽  
Ring Rolling ◽  
Α Phase ◽  
The Impact ◽  
Scanning Electron

The impact toughness of a TA31 titanium alloy cylindrical shell was investigated systemically after ring rolling. The impact toughness of specimens with different notch orientations shows obvious anisotropy. The microstructure of the cylindrical shell and the impact fracture were characterized by an optical microscope and scanning electron microscope. The results show that cracks are easier to propagate in the equiaxed α phase than the elongated α phase. This is because the expanding cracking path in the equiaxed α phase is shorter than that in the elongated α phase, and thereby the cracks are easier to propagate in the equiaxed α phase than the elongated α phase. More specifically, the α phase on the RD-TD plane was obviously isotropic, which makes it easy for the cracks to propagate along α grains in the same direction. However, the α phase on the RD-ND plane has a layered characteristic, and the direction of the α phase varies from layer to layer, thus it requires higher energy for cracks to propagate across this layered α phase. Therefore, the cracks propagating in the same α phase orientation take easier than that in the layered α phase, so it has lower impact toughness.

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