The effect of finish rolling temperature and tempering on the microstructure, mechanical properties and dislocation density of direct-quenched steel

2018 ◽  
Vol 139 ◽  
pp. 1-10 ◽  
Author(s):  
Ari Saastamoinen ◽  
Antti Kaijalainen ◽  
David Porter ◽  
Pasi Suikkanen ◽  
Jer-Ren Yang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Dislocation Density ◽  
Rolling Temperature ◽  
Finish Rolling Temperature ◽  
Finish Rolling ◽  
Quenched Steel

Influence of Finish-Rolling Conditions on Microstructure and Mechanical Properties of Low-Alloy Mn-Ni-Cr-Mo Steel Grade

2011 ◽  
Vol 465 ◽  
pp. 386-389
Author(s):  
Petr Kawulok ◽  
Rostislav Kawulok ◽  
Ivo Schindler ◽  
Jaroslav Sojka ◽  
Martin Kraus ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Physical Simulation ◽  
Thermomechanical Processing ◽  
Tensile Tests ◽  
Ultimate Tensile Stress ◽  
Rolling Temperature ◽  
Air Cooling ◽  
Slow Cooling ◽  
Finish Rolling Temperature ◽  
Finish Rolling

A physical simulation of the thermomechanical processing of the Mn-Ni-Cr-Mo low-alloy steel was performed in the laboratory rolling mill Tandem in the Institute of Modelling and Control of Forming Processes at VŠB – Technical University of Ostrava. The task was to determine the influence of the finish rolling temperature on the structural and mechanical properties of the rolled products. After different modes of rolling and slow cooling in the furnace, the final structure of the tested samples was in all cases composed of ferrite, bainite and islands of martensite. The finish rolling temperature markedly influenced a part by volume of the individual phases as well as the structure homogeneity. The results of the tensile tests at room temperature indicated that the studied steel did not show any pronounced dependence of the yield stress on the finish rolling temperature in the investigated range of values (750 – 1000 °C). On the other hand, the closely corresponding dependences of the ultimate tensile stress and elongation exhibited a considerable and very complex course, which can be explained mainly by the martensite fraction originating during the last stage of the final air cooling from temperature 600 °C.

The Effect of Finish Rolling Temperature on Microstructure and Mechanical Properties of Vanadium Containing Ferritic Stainless Steel

2013 ◽  
Vol 690-693 ◽  
pp. 176-181
Author(s):  
Si Yue Chen ◽  
Jing Xu ◽  
Xin Zhang ◽  
Yi Tao Yang
Keyword(s):  
Mechanical Properties ◽  
Adverse Effect ◽  
Tensile Strength ◽  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
Rolling Temperature ◽  
Wrinkle Resistance ◽  
Finish Rolling Temperature ◽  
Microstructure And Mechanical Properties ◽  
Finish Rolling

In this paper, the influence of finish rolling temperature during hot rolling on microstructure and mechanical properties of ferritic stainless steel containing vanadium was investigated. It showed that with the rolling temperature increasing, the tensile strength and hardness value fell down, while the value of ductility rising and less precipitates appearing. If the finish rolling temperature was set too high, the grain would get coarsened and the α-fiber get strengthened, which had an adverse effect on the formability and wrinkle resistance of the production sheet. 850°C was a reasonable finish rolling temperature.

Effects of the Finish Rolling Temperature on Mechanical Properties and Microstructure Evolution of Line Pipe Steel

2005 ◽  
Vol 475-479 ◽  
pp. 89-92
Author(s):  
Kee Hyun Kim ◽  
Nong Moon Hwang ◽  
Byeong Joo Lee ◽  
Jong Kyu Yoon
Keyword(s):  
Mechanical Properties ◽  
Rolling Temperature ◽  
Cold Climate ◽  
Pipe Steels ◽  
Line Pipe ◽  
Finish Rolling Temperature ◽  
Finish Rolling ◽  
The Matrix ◽  
Proeutectoid Ferrite ◽  
Line Pipe Steel

Mechanical properties of line pipe steels used in the deep sea or in the severe cold climate depend on alloying elements and manufacturing processes and many efforts have been made to enhance the properties of the line pipe steels. In this study, for systematic approaches to the process design of line pipe steels, its phase diagram was calculated using a Thermo-CalcTM program. The calculations indicated that A3 is around 840oC. Setting the FRT(Finish Rolling Temperature) above A3 appears to be critical to the increase of strength and toughness of line pipe steels by increasing the amounts of acicular ferrite and at the same time by decreasing the precipitation of proeutectoid ferrite. In the case of the FRT below A3, relatively large amounts of proeutectoid ferrite are precipitated from the matrix with the carbon contents of the austenite phase around ferrite being enriched.

Microstructure Influenced by Controlled Rolling, Cooling and Thermal Processing of Seamless Tubes Made of Steel 25CrMo4

2020 ◽  
Vol 405 ◽  
pp. 121-126
Author(s):  
Petr Kawulok ◽  
Ivo Schindler ◽  
Stanislav Rusz ◽  
Rostislav Kawulok ◽  
Petr Opěla ◽  
...  
Keyword(s):  
Wall Thickness ◽  
Controlled Rolling ◽  
Rolling Temperature ◽  
Compression Tests ◽  
Structural Variations ◽  
Finish Rolling Temperature ◽  
Finish Rolling ◽  
Physical Simulations ◽  
Plain Strain ◽  
Quenching And Tempering

By use of physical simulations, it was studied the influence of finish rolling temperature (from 820 °C to 970 °C) on the microstructural and mechanical properties of seamless tubes with a different wall thickness (from 6.3 to 40 mm) – in the state after rolling as well as after quenching and tempering. In laboratory conditions, by use of the Simulator HDS-20, the bloom piercing and rolling of the seamless tubes from 25CrMo4 low-alloy steel in a pilger mill were in a simplified way simulated. The wall thickness of the tube influenced the total deformation of specimens at anisothermal multi-pass plain-strain compression tests as well as the final cooling rate. The quenching and tempering of the deformed specimens was subsequently performed with use of the electric resistance furnaces. The finish rolling temperature had only insignificant effect on the resulting properties. Markedly lower hardness was obtained only after the simulation of tube production with the wall thickness of 40 mm contrary to the wall thickness of 6.3 and 20 mm. Structural variations of the specimens after rolling simulations were more or less overlapped by the subsequent quenching from the temperature of 850 °C and tempering at the temperature of 680 °C.

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