scholarly journals Effects of Nb and Mo Addition to 0.2%C-1.5%Si-1.5%Mn Steel on Mechanical Properties of Hot Rolled TRIP-aided Steel Sheets

2004 ◽  
Vol 44 (9) ◽  
pp. 1590-1598 ◽  
Author(s):  
Shunichi Hashimoto ◽  
Shushi Ikeda ◽  
Koh-ichi Sugimoto ◽  
Syugo Miyake
Keyword(s):  
Mechanical Properties ◽  
Steel Sheets ◽  
Hot Rolled ◽  
Mn Steel

scholarly journals Mechanism of Microstructural Control and Mechanical Properties in Hot Rolled Plain C–Mn Steel during Controlled Cooling

2015 ◽  
Vol 55 (8) ◽  
pp. 1721-1729 ◽  
Author(s):  
Chengning Li ◽  
Guo Yuan ◽  
Fengqin Ji ◽  
Jian Kang ◽  
Devesh Misra ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Controlled Cooling ◽  
Hot Rolled ◽  
Mn Steel ◽  
Microstructural Control

scholarly journals Effect of Niobium or Vanadium on Mechanical Properties of Hot Rolled High Strength Steel Sheets for Automotive Use

2007 ◽  
Vol 93 (6) ◽  
pp. 451-458 ◽  
Author(s):  
Daisuke KONDO ◽  
Kazutoshi KUNISHIGE ◽  
Rintaro UEJI ◽  
Shunichi HASHIMOTO
Keyword(s):  
Mechanical Properties ◽  
High Strength Steel ◽  
High Strength ◽  
Steel Sheets ◽  
Hot Rolled

Effect of Finishing Temperature on Mechanical Properties of a Nb-Microalloyed Steel Sheet

2010 ◽  
Vol 129-131 ◽  
pp. 1022-1028
Author(s):  
Daavood Mirahmadi Khaki ◽  
A. Akbarzadeh ◽  
Amir Abedi
Keyword(s):  
Mechanical Properties ◽  
Microalloyed Steel ◽  
Total Elongation ◽  
Controlled Rolling ◽  
Recrystallization Temperature ◽  
Effective Parameters ◽  
Steel Sheets ◽  
Intercritical Range ◽  
Nb Microalloyed Steel ◽  
Hot Rolled

Thermo mechanical processing and controlled rolling of microalloyed steel sheets are affected by several factors. In this investigation, finishing temperature of rolling which is considered as the most effective parameters on the final mechanical properties of hot rolled products has been studied. For this purpose, three different finishing temperatures of 950, 900 and 850 °C below the non-recrystallization temperature and one temperature of 800 °C in the intercritical range were chosen. It is observed that decreasing the finishing temperature causes increase of strength and decrease of total elongation. This is accompanied by more grain refinement of microstructure and the morphology was changed from polygonal ferrite to acicular one. Findings of this research provide suitable connection among finishing temperature, microstructural features, and mechanical properties of hot rolled Nb-microalloyed steel sheets.

Influence of Initial Microstructure on Mechanical Properties of Cu Bearing Extra Low Carbon Steel Sheets

2010 ◽  
Vol 654-656 ◽  
pp. 306-309
Author(s):  
Sim Kun Min ◽  
Sung Il Kim ◽  
Jong Sang Kim ◽  
Moon Hi Hong
Keyword(s):  
Mechanical Properties ◽  
Hot Rolling ◽  
Low Carbon Steel ◽  
Onset Time ◽  
Continuous Annealing ◽  
Low Carbon ◽  
Initial Microstructure ◽  
Steel Sheets ◽  
Axial Tensile ◽  
Hot Rolled

This paper examines the effect of initial microstructure after hot rolling on the final microstructure and mechanical properties for Cu bearing Extra Low Carbon(ELC) Steel Sheets. For this purpose, two ELC steels having different initial microstructures due to different onset time of cooling after pilot hot rolling (0.4 and 1.2 second) were selected. Mechanical properties and microstructures were analyzed as well using uni-axial tensile test, electron back-scattered diffraction (EBSD) technique following pilot rolling and continuous annealing. It has been found that the reduction of onset time of cooling gives rise to the grain refinement in hot rolled sheets. The average grain sizes of hot rolled sheetss at the onset time of 0.4 and 1.2 second are 16.7μm and 20.8 μm, respectively. In addition, the planar anisotropy of the Cu bearing ELC steel sheets has improved with reducing onset time of cooling after hot rolling. However, other mechanical properties such as strength and elongation of annealed steel are similar to both cooling condition.

scholarly journals Production Technology and Mechanical Properties of High Strength Hot Rolled Steel Sheets

1982 ◽  
Vol 68 (9) ◽  
pp. 1290-1296
Author(s):  
Isao TAKAHASHI ◽  
Nobuo AOYAGI ◽  
Shoichi TAKIZAWA ◽  
Masayoshi KUWAGATA ◽  
Minoru NISHIDA ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Production Technology ◽  
High Strength ◽  
Rolled Steel ◽  
Steel Sheets ◽  
Hot Rolled ◽  
Hot Rolled Steel

Cold Rolling Effect on Microstructure and Mechanical Properties of Low Carbon Al-Killed Steels

2015 ◽  
Vol 812 ◽  
pp. 315-320
Author(s):  
Enikö Réka Fábián ◽  
Áron Kótai
Keyword(s):  
Mechanical Properties ◽  
Cold Rolling ◽  
Low Carbon Steel ◽  
Optical Microscope ◽  
Low Carbon ◽  
Coiling Temperature ◽  
Steel Sheets ◽  
Hot Rolled ◽  
Ebsd Method ◽  
Scanning Electron

It have been studied the cold rolling effects on the microstructure of samples prepared from Al-killed low carbon steel sheets with high coiling temperatures. The microstructure of the hot rolled steels sheet is formed from ferrite and large carbides when the coiling temperature is high. The cold rolling affects the steel mechanical and electrochemical properties due to microstructural changes. We have studied the microstructure by optical microscope and scanning electron microscope. Low angles grain boundaries and the texture of samples were studied by EBSD method.

Development of an Ultrafine Grained Ferrite in a Low C-Mn Steel Intensely Deformed under Hot Torsion

2004 ◽  
Vol 467-470 ◽  
pp. 1271-1276
Author(s):  
G. Azevedo ◽  
Ronaldo Barbosa ◽  
Dagoberto Brandão Santos
Keyword(s):  
Mechanical Properties ◽  
Grain Sizes ◽  
Dynamic Transformation ◽  
Ultrafine Grained ◽  
Size And Morphology ◽  
Hot Torsion ◽  
Hot Rolled ◽  
Mn Steel ◽  
Ferrite Grain Size ◽  
Torsion Deformation

In the last years, several studies concerning ultra refinement of ferrite grains have been conducted using different experimental techniques (ECAP, ARB, HPT). The aim of all investigations was to provide an optmized relationship between mechanical properties and microstructure of steels. The present work, likewise, deals with strain induced dynamic transformation of ferrite. Samples of low C-Mn steel were intensely deformed in hot torsion aiming at the production of ultrafine grains of ferrite thereby enhancing the mechanical properties when compared to hot rolled products. After soaking during 5min at 900°C, the samples were quenched and then reheated and submitted to hot torsion deformation at temperatures of 700 and 740°C. The torsion schedule consisted of 7 isothermal passes leading to a total strain of ≈1, generating an ultrafine microstructure with grain sizes of the order of 1µm. The shape of stress-strain curves so obtained suggested that ferrite refinement occurred by dynamic recrystallization. The various constituents present in the microstructure as well as ferrite grain size and morphology were examined by optical and scanning electron microscopy. Microhardness tests were performed to evaluate mechanical properties.

Effect of Al on the Microstructure and Mechanical Properties of Hot-Rolled Medium-Mn Steel

2018 ◽  
Vol 941 ◽  
pp. 292-298 ◽  
Author(s):  
Ding Ting Han ◽  
Yun Bo Xu ◽  
Ying Zou ◽  
Zhi Ping Hu ◽  
Shu Qing Chen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Trip Steel ◽  
Retained Austenite ◽  
Mechanical Stability ◽  
Volume Fraction ◽  
Microstructure And Mechanical Properties ◽  
Medium Mn Steel ◽  
Hot Rolled ◽  
Mn Steel

The present investigation was made to study the effect of Al on the microstructure and mechanical properties of hot-rolled medium-Mn TRIP steel (abbreviated as Al-TRIP). As a contrast, a Si-added medium-Mn TRIP steel (abbreviated as Si-TRIP) was also studied. Addition Al in medium-Mn steel can raise Ac3 temperature, which will restrain austenite transformation and expand the two-phase region, promoting Mn and C elements enriched in austenite. In-depth microstructure and mechanical properties analysis were carried out for the hot-rolled Al-TRIP and Si-TRIP steels in this study. The microstructure was characterized by scanning electron microscope (SEM) and electron probe microanalyzer (EPMA). Volume fraction of retained austenite was measured by D/max2400 X-ray diffractometer (XRD). A dual-phase microstructure consisting of ultra-fine grained intercritical ferrite (IF) and lath-like retained austenite (RA) with high mechanical stability was obtained after annealing at 630°C for 2h for Al-TRIP steel. As prolonging the intercritical annealing time, the stability of RA decreased primarily due to the increase of grain size. The tensile test results indicated that the Al-TRIP steel possessed a better combination of tensile strength and elongation compared to Si-TRIP steel. Excellent mechanical properties with yield strength of 790MPa, tensile strength of 1050MPa, total elongation of 35% and UTS×TEL of 39GPa·% was obtained for the Al-TRIP steel.

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