Effect of microstructure on mechanical properties of C-Mn high strength hot rolled sheet steel.

This study deals with a relationship between strength and coiling temperature of high strength hot-rolled sheet steels consisting of ferrite and nanometer-sized carbides in order to evaluate the stability of the strength against the variation of the coiling temperature. Ti-Mo-bearing and Ti-bearing steels were prepared to form (Ti,Mo)C and TiC in ferrite matrix, respectively. Ti-Mo-bearing steel exhibited the high strength even under the high temperature coiling while the strength of Ti-bearing steel decreased significantly. Ti-bearing steel just after transforming at 923K had the same hardness as that at 898K. In addition, hardness of Ti-bearing steel coiled at 898K decreased significantly by holding at 923K for 8.64ks while Ti-Mo-bearing steel did not represent a large change in hardness. These results confirm that (Ti,Mo)C is not coarsened easily by Ostwald ripening at the high coiling temperature unlike TiC. Consequently the retardation of Ostwald ripening of (Ti,Mo)C is attributed to the small amount of titanium in solution in Ti-Mo-bearing steel.

Download Full-text

MATHEMATICAL DEPENDENCES BETWEEN THE MECHANICAL PROPERTIES OF HIGH-STRENGTH ROLLED SHEET STEEL AND ITS CHEMICAL COMPOSITION AND HEAT TREATMENT CONDITIONS

Vestnik of Nosov Magnitogorsk State Technical University ◽

10.18503/1995-2732-2016-14-4-72-75 ◽

2016 ◽

Vol 14 (4) ◽

pp. 72-75

Author(s):

Mikhail V. Chukin ◽

◽

Pavel P. Poletskov ◽

Dmitry G. Nabatchikov ◽

Marina S. Gushchina ◽

...

Keyword(s):

Mechanical Properties ◽

Heat Treatment ◽

Chemical Composition ◽

Sheet Steel ◽

High Strength ◽

Rolled Sheet ◽

Treatment Conditions

Download Full-text

Precipitation behavior and mechanical properties of hot-rolled high strength Ti–Mo-bearing ferritic sheet steel: The great potential of nanometer-sized (Ti, Mo)C carbide

Journal of Materials Research ◽

10.1557/jmr.2016.154 ◽

2016 ◽

Vol 31 (9) ◽

pp. 1254-1263 ◽

Cited By ~ 11

Author(s):

Ke Zhang ◽

Zhaodong Li ◽

Zhenqiang Wang ◽

Xinjun Sun ◽

Qilong Yong

Keyword(s):

Mechanical Properties ◽

Sheet Steel ◽

High Strength ◽

Precipitation Behavior ◽

Image Position ◽

Hot Rolled

Abstract

Download Full-text

Niobium Bearing Ferrite-Bainite High Strength Hot-rolled Sheet Steel with Improved Formability

Transactions of the Iron and Steel Institute of Japan ◽

10.2355/isijinternational1966.23.303 ◽

1983 ◽

Vol 23 (4) ◽

pp. 303-311 ◽

Cited By ~ 52

Author(s):

Masatoshi SUDO ◽

Shun-ichi HASHIMOTO ◽

Shoji KAMBE

Keyword(s):

Sheet Steel ◽

High Strength ◽

Rolled Sheet ◽

Hot Rolled

Download Full-text

Effect of Reduction in Thickness and Rolling Conditions on Mechanical Properties and Microstructure of Rolled Mg-8Al-1Zn-1Ca Alloy

Advances in Materials Science and Engineering ◽

10.1155/2017/4065434 ◽

2017 ◽

Vol 2017 ◽

pp. 1-9 ◽

Cited By ~ 2

Author(s):

Yuta Fukuda ◽

Masafumi Noda ◽

Tomomi Ito ◽

Kazutaka Suzuki ◽

Naobumi Saito ◽

...

Keyword(s):

Mechanical Properties ◽

Grain Size ◽

High Strength ◽

Rolling Process ◽

Rolled Sheet ◽

Roll Temperature ◽

Mean Grain Size ◽

Thick Rolled Sheet ◽

Hot Rolled ◽

Strength And Ductility

A cast Mg-8Al-1Zn-1Ca magnesium alloy was multipass hot rolled at different sample and roll temperatures. The effect of the rolling conditions and reduction in thickness on the microstructure and mechanical properties was investigated. The optimal combination of the ultimate tensile strength, 351 MPa, yield strength, 304 MPa, and ductility, 12.2%, was obtained with the 3 mm thick Mg-8Al-1Zn-1Ca rolled sheet, which was produced with a roll temperature of 80°C and sample temperature of 430°C. This rolling process resulted in the formation of a bimodal structure in the α-Mg matrix, which consequently led to good ductility and high strength, exclusively by the hot rolling process. The 3 mm thick rolled sheet exhibited fine (mean grain size of 2.7 μm) and coarse grain regions (mean grain size of 13.6 μm) with area fractions of 29% and 71%, respectively. In summary, the balance between the strength and ductility was enhanced by the grain refinement of the α-Mg matrix and by controlling the frequency and orientation of the grains.

Download Full-text