The effect of thermomechanical process on metallurgical and mechanical properties of 38MnVS6 micro alloyed steel

2021 ◽  
Vol 52 (6) ◽  
pp. 644-654
Author(s):  
Y. Erçayhan ◽  
N. Saklakoğlu
Keyword(s):  
Mechanical Properties ◽  
Alloyed Steel ◽  
Thermomechanical Process ◽  
Micro Alloyed Steel

Optimization of mechanical properties of a micro alloyed steel

2009 ◽  
Vol 30 (6) ◽  
pp. 2167-2172 ◽  
Author(s):  
D. Rasouli ◽  
Sh. Khameneh Asl ◽  
A. Akbarzadeh ◽  
G.H. Daneshi
Keyword(s):  
Mechanical Properties ◽  
Alloyed Steel ◽  
Micro Alloyed Steel

scholarly journals Influence of Coiling Temperature on Microstructure, Precipitation Behaviors and Mechanical Properties of a Low Carbon Ti Micro-Alloyed Steel

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1173
Author(s):  
Mingxue Sun ◽  
Yang Xu ◽  
Wenbo Du
Keyword(s):  
Mechanical Properties ◽  
Vickers Hardness ◽  
Tensile Tests ◽  
Alloyed Steel ◽  
Low Carbon ◽  
Coiling Temperature ◽  
Fine Grain ◽  
Transmission Electron ◽  
Rolling Experiment ◽  
Micro Alloyed Steel

The microstructural evolution, nanosized precipitation behaviors and mechanical properties of a Ti-bearing micro-alloyed steel at different coiling temperatures were studied using optical microstructure (OM), scanning electron micrograph (SEM), transmission electron microscopy (TEM), Vickers hardness and tensile tests. When the coiling temperature was 500 °C, the specimen showed mainly bainitic structure, whereas polygonal ferrite was visible as the coiling temperature increased to 650 °C and 700 °C. The Vickers hardness of tested steel reached the maximum, which can be attributed to the largest number of nanosized precipitates in ferrite at the coiling temperature of 650 °C. A coiling temperature of 650 °C was optimal for the formation of TiC because of the high diffusion rate of alloying elements and kinetics of precipitation. In the laboratory rolling experiment, when the coiling temperature was 630 °C, the steel with yield strength of 682 ± 2.1 MPa and tensile strength of 742 ± 4.9 MPa was produced. The fine-grain strengthening and precipitation strengthening were 262 MPa and 268 MPa, respectively.

Effect of Different Normalizing Processes on Microstructure, Precipitation Behavior and Mechanical Properties of V-Ti-Micro-Alloyed Steel Alloys

2020 ◽  
Vol 835 ◽  
pp. 243-250
Author(s):  
Ahmed Hamed ◽  
Mamdouh Eissa ◽  
Abdelhakim Kandil ◽  
Omnia Ali ◽  
Taha Mattar
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
High Strength ◽  
Optimum Combination ◽  
Alloyed Steel ◽  
Steel Alloy ◽  
Precipitation Behavior ◽  
Steel Alloys ◽  
Micro Alloyed Steel ◽  
Holding Temperature

Normalizing is an effective heat treatment in improving the microstructure and developing the mechanical properties of micro-alloyed steel. The normalizing parameters such as temperature and holding time are the main keys to microstructure and mechanical properties controlling. Therefore, obtaining an optimum combination of mechanical properties must be subjected to an ideal combination of these parameters. Furthermore, adjusting the optimum normalizing parameters must be considered for every chemical composition depending on the critical transformation temperatures. In this work, four micro-alloyed steel alloys containing V (0.008-0.1wt %) and Ti (0.002-0.072) were held on different normalizing temperatures for 30 minutes. The first holding temperature was carried out just above the Ac3 temperature and the second was carried out above the Ac3 by 100°C (Ac3+100°C). With the controlled normalizing condition, V-Ti-micro-alloyed steel alloy has produced an ultra-fine structure of grain size 2.2 microns and combined high strength of 725 MPa YS, 1058 MPa UTS and good ductility of 20%.

Effect of Ferrite Status on Mechanical Properties of Hot-Rolled Directly Quenched and Partitioned Steel

2015 ◽  
Vol 816 ◽  
pp. 736-742 ◽  
Author(s):  
Xiao Dong Tan ◽  
Xiao Long Yang ◽  
Yun Bo Xu ◽  
Zhi Ping Hu ◽  
Fei Peng ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Retained Austenite ◽  
Tensile Deformation ◽  
Alloyed Steel ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Low Carbon ◽  
Phosphorus Addition ◽  
High Silicon ◽  
Micro Alloyed Steel

Hot-rolling direct quenching and partitioning (HDQ&P) processes were applied to both low carbon high silicon vanadium micro-alloyed steel and low carbon low silicon steel with phosphorus addition. Proeutectoid ferrite with an area fraction of about 30% was introduced into some of the sheets. Microstructures were characterized using SEM, TEM and XRD. Mechanical properties were investigated by means of uniaxial tensile test. Austenite stabilization, retained austenite stability, tensile deformation and fracture were comprehensively analyzed by making the comparison between the two steels and between the sheets with and without ferrite considering the different precipitation statuses in ferrite. Experimental results showed that the high silicon vanadium micro-alloyed steel contained more retained austenite with higher stability compared with the low silicon phosphorus added steel. Filled with much more carbides with larger sizes, the martensite in the low silicon phosphorus added steel exhibited a much salient tempered feature. The high silicon vanadium added steel possessed higher strength and ductility than the low silicon phosphorus added steel. The introduction of ferrite can result in an extremely obvious post-necking elongation drop in the low silicon phosphorus added steel. The dispersed V-bearing precipitates and high silicon content in ferrite can increase the yield strength and simultaneously diminish the hardness difference between ferrite and martensite, which can improve their compatible deformation capability and then enhance the work hardening ability and finally raise both the UTS and elongation of the steel.

Modification of MnS inclusion by tellurium in 38MnVS6 micro-alloyed steel

2020 ◽  
Vol 117 (6) ◽  
pp. 615
Author(s):  
Ping Shen ◽  
Lei Zhou ◽  
Qiankun Yang ◽  
Zhiqi Zeng ◽  
Kenan Ai ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Aspect Ratio ◽  
Strong Influence ◽  
Experimental Results ◽  
Alloyed Steel ◽  
Equivalent Diameter ◽  
Small Aspect Ratio ◽  
Steel Quality ◽  
Eds Analysis ◽  
Micro Alloyed Steel

In 38MnVS6 steel, the morphology of sulfide inclusion has a strong influence on the fatigue life and machinability of the steel. In most cases, the MnS inclusions show strip morphology after rolling, which significantly affects the steel quality. Usually, the MnS inclusion with a spherical morphology is the best morphology for the steel quality. In the present work, tellurium was applied to 38MnVS6 micro-alloyed steel to control the MnS inclusion. Trace tellurium was added into 38MnVS6 steel and the effect of Te on the morphology, composition, size and distribution of MnS inclusions were investigated. Experimental results show that with the increase of Te content, the equivalent diameter and the aspect ratio of inclusion decrease strikingly, and the number of inclusions with small aspect ratio increases. The inclusions are dissociated and spherized. The SEM-EDS analysis indicates that the trace Te mainly dissolves in MnS inclusion. Once the MnS is saturated with Te, MnTe starts to generate and wraps MnS. The critical Te/S value for the formation of MnTe in the 38MnV6 steel is determined to be approximately 0.075. With the increase of Te/S ratio, the aspect ratio of MnS inclusion decreases and gradually reaches a constant level. The Te/S value in the 38MnVS6 steel corresponding to the change of aspect ratio from decreasing to constant ranges from 0.096 to 0.255. This is most likely to be caused by the saturation of Te in the MnS inclusion. After adding Te in the steel, rod-like MnS inclusion is modified to small inclusion and the smaller the MnS inclusion, the lower the aspect ratio.

Spectrum imaging and three-dimensional atom probe studies of fine particles in a vanadium micro-alloyed steel

2008 ◽  
Vol 24 (6) ◽  
pp. 641-650 ◽  
Author(s):  
A. J. Craven ◽  
M. MacKenzie ◽  
A. Cerezo ◽  
T. Godfrey ◽  
P. H. Clifton
Keyword(s):  
Fine Particles ◽  
Three Dimensional ◽  
Atom Probe ◽  
Alloyed Steel ◽  
Spectrum Imaging ◽  
Micro Alloyed Steel
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