Microstructure and Properties of 65Mn Steel after Austenite Inverse Phase Transformation by Sub-Temperature Quenching

2011 ◽  
Vol 194-196 ◽  
pp. 89-94
Author(s):  
An Ming Li ◽  
Meng Juan Hu
Keyword(s):  
Mechanical Properties ◽  
Phase Transformation ◽  
Phase Structure ◽  
Dual Phase ◽  
Temperature Quenching ◽  
Quenching Temperature ◽  
Microstructure And Properties ◽  
Nucleation Sites ◽  
Better Than

The influence of sub-temperature quenching temperature on the strength and hardness of 65Mn steel during austenite inverse phase transformation is studied and the microstructure and property are analyzed. The results showed that in the range of 760~810°C , the strength and hardness of the 65Mn steel second sub-temperature quenched increased with quenching temperature increasing, reached the highest strength and hardness at 790°C quenching and then began to decrease. A small number of ferrite and ferrite dual-phase structure existed in martensite when quenching temperature was low. Fine martensite was obtained by second sub-temperature quenching due to the smaller austenitic crystal grain and austenitic nucleation sites. The mechanical properties of samples second sub-temperature quenched are better than that of conventional samples 830°C once quenched.

Microstructure and Mechanical Properties of 60Si2Mn Steel after Austenite Inverse Phase Transformation by Sub-Temperature Quenching

2011 ◽  
Vol 399-401 ◽  
pp. 228-232
Author(s):  
An Ming Li ◽  
Meng Juan Hu
Keyword(s):  
Mechanical Properties ◽  
Phase Transformation ◽  
Grain Refinement ◽  
Ferrite Phase ◽  
Temperature Quenching ◽  
Quenching Temperature ◽  
Austenitic Phase ◽  
Microstructure And Mechanical Properties ◽  
Nucleation Sites ◽  
Better Than

Microstructure and mechanical properties of 60Si2Mn steel by 870 °C prequenched and second sub-temperature quenching was studied. The results showed that the hardness of the 60Si2Mn steel first increased and then decreased with increasing second sub-temperature quenching temperature, and the highest hardness was obtained when sub-temperature quenching temperature was 800 °C.The sample after second sub-temperature quenching was composed of martensite and a little ferrite phase. The abundance of ferrite phase decreased with the increase in second sub-temperature quenching temperature. Fine martensite was obtained by second sub-temperature quenching, which may be relate to the grain refinement of austenitic phase and austenitic nucleation sites. The mechanical properties of the 60Si2Mn steel after 870 °C prequenching and second sub-temperature quenching are better than that of conventional samples after 870 °C quenching.

scholarly journals Effects of the Nanostructured Fe-V-Nb Modificators on the Microstructure and Mechanical Properties of Si-Mn Steel

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Tiebao Wang ◽  
Chunxiang Cui ◽  
Kuo Jia ◽  
Lichen Zhao
Keyword(s):  
Mechanical Properties ◽  
Microalloyed Steel ◽  
Fracture Morphology ◽  
Rapid Quenching ◽  
Tem Analysis ◽  
Nanoscale Particles ◽  
Microstructure And Mechanical Properties ◽  
Nucleation Sites ◽  
Mn Steel ◽  
Better Than

The nanostructured Fe-V-Nb master alloy was prepared in vacuum rapid quenching furnace and then was added in the steel melts as modificators before casting. Next, the effects of the nanostructured Fe-V-Nb modificators on the microstructure and mechanical properties of the steel were studied. The results show that the grain size of the steel has been effectively refined, which is mainly because the dispersed nanoscale particles can produce more nucleation sites during the solidification of the liquid steel. Tensile properties and fracture morphology reveal that the yield strength and toughness of the steel modified by nanostructured Fe-V-Nb modificators are better than that of the microalloyed steel. TEM analysis shows that vanadium and niobium in the modificators exist in the form of (V, Nb) C which effectively increases the nucleation rate and leads to better mechanical properties of the steel.

scholarly journals Effect of Roller Quenching on Microstructure and Properties of 300 mm Thickness Ultra-Heavy Steel Plate

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1238
Author(s):  
Jun Han ◽  
Tianliang Fu ◽  
Zhaodong Wang ◽  
Guodong Wang
Keyword(s):  
Mechanical Properties ◽  
Cooling Rate ◽  
Steel Plate ◽  
Temperature Curve ◽  
Steel Plates ◽  
Quenching Temperature ◽  
Microstructure And Properties ◽  
Testing Method ◽  
Average Grain Size ◽  
Length Direction

In this paper, a 300 mm thickness ultra-heavy steel plate was selected as the research object. In addition, special roller quenching equipment and a new testing method were used to measure the quenching temperature curve at different positions of the steel plate. The relationships and corresponding interaction mechanisms between cooling rate, microstructure, and mechanical properties of an ultra-heavy steel plate during roller quenching were investigated. The results indicated that the cooling rate, strength, hardness, and impact energy decreased gradually along the thickness direction of the plate, while the cooling rate, average grain size, and mechanical properties were relatively uniform with little change along the length direction of the plate. The experimental results provide an effective way to further control the microstructure and properties of ultra-heavy steel plates during roller quenching.

Correlation between Microstructure and Properties of Semi-Solid Products

2019 ◽  
Vol 285 ◽  
pp. 12-23 ◽  
Author(s):  
Annalisa Pola
Keyword(s):  
Mechanical Properties ◽  
Fatigue Wear ◽  
Microstructure And Properties ◽  
Tensile Fatigue ◽  
Wear And Corrosion ◽  
Semi Solid ◽  
Wear And Corrosion Resistance ◽  
Permanent Mold Castings ◽  
The Relationship ◽  
Better Than

Since the very first production trials, it was evident that semi-solid components exhibit excellent mechanical properties, comparable to those of forged material and, in any case, better than permanent mold castings. Over the years, these findings have been confirmed by many authors. Most of the papers available in scientific literature deals with the demonstration of this improvement, especially in order to show the reliability of new and alternative production routes. On the contrary, only some studies focus their attention on the relationship between enhanced mechanical properties and the microstructure. However, it is demonstrated that the increased performance of semi-solid components is not only due to the absence of porosity, but there is a clear relationship between microstructure and properties. This paper reports about the state of knowledge in this subject, in particular for what concerns tensile, fatigue, wear and corrosion resistance.

The Influence of Quenching Temperature on the Mechanical Properties of a Dual-Phase Steel with 0.094% C and 0.53% Mn

2015 ◽  
Vol 808 ◽  
pp. 28-33 ◽  
Author(s):  
Constantin Dulucheanu ◽  
Nicolai Bancescu ◽  
Traian Severin
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Dual Phase Steel ◽  
Volume Fraction ◽  
Total Elongation ◽  
Metallographic Analysis ◽  
Dual Phase ◽  
Quenching Temperature ◽  
Offset Yield Strength ◽  
Martensite Structure

In this article, the authors have analysed the influence of quenching temperature (TQ) on the mechanical properties of a dual-phase steel with 0.094 % C and 0.53% Mn. In order to obtain a ferrite-martensite structure, specimens of this material have been the subjected to intercritical quenching that consisted of heating at 750, 770, 790, 810 and 830 °C, maintaining for 30 minutes and cooling in water. These specimens have then been subjected to metallographic analysis and tensile test in order to determine the volume fraction of martensite (VM) in the structure, ultimate tensile strength (Rm), the 0.2% offset yield strength (Rp0.2), the total elongation (A5) and the Rp0.2/Rm ratio.

Effect of Sub-Temperature Quenching Temperature on Microstructure and Property of 35CrMo Steel

2012 ◽  
Vol 490-495 ◽  
pp. 3257-3261
Author(s):  
An Ming Li ◽  
Meng Juan Hu
Keyword(s):  
Tensile Strength ◽  
Impact Toughness ◽  
Lath Martensite ◽  
Duplex Microstructure ◽  
Temperature Quenching ◽  
Quenching Temperature ◽  
Microstructure Characteristics ◽  
35Crmo Steel ◽  
The Impact ◽  
Better Than

Influence of sub-temperature quenching temperature on the tensile strength, hardness and toughness of 35CrMo steel was studied. The microstructure characteristics of this steel after sub-temperature quenching were analyzed. The results showed in the range of 780~810°C the strength and hardness of the 35CrMo steel sub-temperature quenched increased with quenching temperature increasing, reached the highest strength and hardness at 800°C quenching and then began to decrease, while its elongation decreased with the quenching temperature increasing. The duplex microstructure of martensite and ferrite was obtained by sub-temperature quenching of 35CrMo steel. With the quenching temperature increasing, the ferrite content decreased and the distribution of ferrite morphology was changed. A small amount of strip ferrite existed in lath martensite lamellar when quenching temperature was 800°C and the impact toughness of 35CrMo steel was better than that of conventional samples 850°C completely quenched.

scholarly journals Microstructural and Mechanical Characterization of Shielded Metal Arc Welded Dual Phase Steel Joints

2020 ◽  
Vol 44 (6) ◽  
pp. 381-386
Author(s):  
Walid Laroui ◽  
Redouane Chegroune ◽  
Şükrü Talaş ◽  
Mourad Keddam ◽  
Riad Badji
Keyword(s):  
Mechanical Properties ◽  
Dual Phase Steel ◽  
Volume Fraction ◽  
Plain Carbon Steel ◽  
Welding Parameters ◽  
Dual Phase ◽  
Shielded Metal Arc Welding ◽  
Dual Phase Steels ◽  
Quenching Temperature ◽  
Metal Arc Welding

Dual Phase steels are widely used in industry for various reasons for their improved mechanical properties owing to their ferrite and martensite contents in microstructure and good formability at industrial scale to achieve final shape with good ductility. In this study, shielded metal arc welding experiments were performed in order to evaluate the metallurgically and mechanically the properties of Dual Phase steels obtained from plain carbon steel AISI 1010 by water quenching at intercritical temperatures. Martensite volume fraction (MVF) was related to the intercritical quenching temperature which defines the mechanical properties of Dual Phase steel. All the welding parameters were kept constant in order to get a value of heat input equals 1.37 KJ/mm for all weldments. Martensite was found to be predominated in the fusion zone and its hardness was the highest compared to base metal (BM) and heat affected zone (HAZ). The extent of ductile zone was found to be dependent on the MVF and reached over 1.2 mm wide. Tensile properties of weldments were deteriorated by 35% in ultimate tensile strength (UTS) and by 15% in elongation. The failure of all the welded joints was occurred in the SC zone, with the fractured surfaces of a dimple feature.

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