scholarly journals Influence of cooling intensity on the structure formation in stripe steel by thermomechanical treatment

2004 ◽  
Vol 40 (1) ◽  
pp. 75-88 ◽  
Author(s):  
V. Goryany ◽  
T. Khlyntseva ◽  
I. Mamuzic ◽  
V. Radsinsky
Keyword(s):  
Mechanical Properties ◽  
Carbon Steel ◽  
Cross Section ◽  
Low Carbon Steel ◽  
Accelerated Cooling ◽  
Rolled Strip ◽  
Rolled Steel ◽  
Low Carbon ◽  
Cooling Intensity ◽  
High Level

The results of research of microstructure of the strips from low carbon steel 45x6 and 30x8 mm in hot-rolling condition and after accelerated cooling of different intencity and schemes of the coolers movement in the cooling chambers are shown. The strengthening layer is spread unevenly along the perimeter of the rolled steel. The formation character of the structure and its spreading along the cross-section depends on intensity of cooling and the ratio of the width of the stripe to its thickness. Regimes, that provide the high level of steel?s strength with the smallest changing of the mechanical properties by the length of the rolled strip were defined.

scholarly journals The study of the microstructure and mechanical properties of low carbon steel, microalloying by boron

2019 ◽  
Vol 57 (1) ◽  
pp. 143-148
Author(s):  
Anatoly A. Babenko ◽  
◽  
Natalia I. Selmensky ◽  
Alena G. Upolovnikova ◽  
◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Steel ◽  
Nonmetallic Inclusions ◽  
Volume Fraction ◽  
Low Carbon Steel ◽  
Strength Properties ◽  
Rolled Steel ◽  
Low Carbon ◽  
Bainite Structure ◽  
Temporary Resistance

The paper presents the results of the study of non-metallic inclusions, the structure and mechanical properties of low carbon steel, microalloying by boron. The study of the amount and composition of nonmetallic inclusions showed that with the introduction of boron the volume fraction of oxide and oxysulfide inclusions increases and the volume fraction of sulfide inclusions significantly decreases. At the same time, the alloying of steel with boron increases to 99.7% the proportion of inclusions with a size of no more than 5 microns against 80.6% in the metal without boron. In the metal with boron, nonmetallic inclusions larger than 10 μm are absent, while in the metal without boron their share is 13.6%. Studies have shown that in a metal containing 0.011% boron, independent boron-containing inclusions were not detected. Boron was not detected in the composition of the studied nonmetallic inclusions. In all samples, steel nonmetallic inclusions are represented mainly by oxide, oxysulfide and sulfide inclusions. In the boron-free steel, a small amount of perlite is present along with the ferritic phase. Steel microalloying by boron is accompanied by the formation of a dispersed ferrite-bainite structure, which consists of fine-grained ferrite with bainite sites with a tendency to form bainite strips along the rolling direction. The microhardness of ferrite and perlite in steel without boron does not exceed an average of 180 and 214 HV10, respectively. It is noted that the presence of boron in steel in an amount of 0.011% increases the microhardness of ferrite to 260 HV10 and bainite to 335 HV10. The mechanical properties of hot-rolled steel with a thickness of 10 mm from boron-containing low-alloyed steel, due to the predominant formation of small rounded inclusions with a size of no more than 5 microns and the formation of a fine ferrite-bainite structure, are characterized by enhanced strength properties with preservation of plastic characteristics. The absolute values of the yield strength and temporary resistance of steel with boron reach 575 and 650 MPa, respectively. With such strength properties of metal, high plastic characteristics are preserved. Rolled steel without boron is characterized by reduced to 540 and 610 MPa tensile strength and temporary resistance, respectively.

Influence of laser surface hardened layer on mechanical properties of re-engineered low carbon steel sheet

2017 ◽  
Vol 685 ◽  
pp. 168-177 ◽  
Author(s):  
Badirujjaman Syed ◽  
Sulthan Mohiddin Shariff ◽  
Gadhe Padmanabham ◽  
Shaumik Lenka ◽  
Basudev Bhattacharya ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Steel ◽  
Steel Sheet ◽  
Low Carbon Steel ◽  
Hardened Layer ◽  
Laser Surface ◽  
Low Carbon ◽  
Carbon Steel Sheet ◽  
Surface Hardened Layer

Microstructure and Mechanical Properties of a Low-Carbon Steel Treated by One-Step Quenching and Partitioning Process

2014 ◽  
Vol 1082 ◽  
pp. 202-207 ◽  
Author(s):  
Shu Yan ◽  
Xiang Hua Liu
Keyword(s):  
Mechanical Properties ◽  
Carbon Steel ◽  
Microstructural Evolution ◽  
Retained Austenite ◽  
Uniform Elongation ◽  
Low Carbon Steel ◽  
Total Elongation ◽  
Low Carbon ◽  
Quenching And Partitioning ◽  
Partitioning Time

A low carbon steel was treated by quenching and partitioning (Q&P) process, and a detailed characterization of the microstructural evolution and testing of mechanical properties were carried out. The resulted mechanical properties indicate that with the partitioning time increasing, the tensile strength decreases rapidly first and then remains stable, and the total elongation increases first then decreases. The investigated steel subjected to Q&P process exhibits excellent products of strength and elongation (17.8-20.6 GPa•%). The microstructural evolution of martensite matrix during the partitioning step was observed, and the morphology and content of retained austenite were characterized. The working hardening behavior of the samples was analyzed, and the retained austenite with higher carbon content contributes to the uniform elongation more effectively.

Microstructures and mechanical properties of equal-channel angular pressed low carbon steel

2000 ◽  
Vol 42 (7) ◽  
pp. 695-699 ◽  
Author(s):  
Dong Hyuk Shin ◽  
Chang Woo Seo ◽  
Jongryoul Kim ◽  
Kyung-Tae Park ◽  
Wung Young Choo
Keyword(s):  
Mechanical Properties ◽  
Carbon Steel ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Microstructures And Mechanical Properties
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