Ultrafine Grained Steels with Improved Ductility Fabricated by Repetitive Thermo‐Mechanical Processing

Lan, Huifang; Du, Linxiu; Wang, Xiaonan; Li, Xianghua

doi:10.1002/srin.201100169

Cited by 3 publications

(1 citation statement)

References 15 publications

(15 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Meanwhile, the TMCP principle to get fine microstructures has also been used for low and medium carbon bainitic steels, high strength bainitic steel, Dual Phase steel, precipitation hardened ferritic‐pearlitic steel, TRIP‐Steel, medium carbon steels, Spring steels, eutectoid and bearing steels, Mn‐Hadfield‐steel, over‐eutectoid steel, Creep resistant 9%Cr‐steel, and stainless steels . Automotive sheet metals are also TM‐rolled to obtain fine microstructures before cold rolling and annealing, but they will be treated in another paper of this issue.…”

Section: Successful Tmcp Applications For Flat Productsmentioning

confidence: 99%

Thermomechanical Treatment of Steels - A Real Disruptive Technology Since Decades

Buchmayr

2017

steel research int.

View full text Add to dashboard Cite

The basic concept of thermomechanical treatment (TMT) or thermomechanical controlled processing (TMCP) is responsible for the development of many advanced steel grades with improved mechanical properties during the last 50 years. A retroperspective view, an explanation of the most important influencing factors and a presentation of the enormous benefits for the costumer are given in this review. A sound knowledge on the synergism of recrystallization, precipitation, and transformation phenomena forms the basis to produce fine, homogeneous microstructures with improved properties. Starting from structural steels, improvements can be achieved with respect to higher strength and toughness values combined with better weldability and formability, mainly based on reduction of carbon content and finer grain sizes. The benefits in the application areas are described in detail. TMCP is not only used for flat products, but also for long products and forgings of different steel grades. Physical simulation and modeling contribute significantly to these developments, which also form the basis for computer-aided control or real-time online-models. In the next years, a complete shift to cyber physical systems (CPS) is predicted, which needs an aligned education effort. REVIEW A Brief Historical ReviewSince the mid-sixties, steel mills began to produce fine grained structural steels by lowering the final rolling temperature. Based on fundamental research in Germany, USA, UK, Germany, and Japan, the fundamental understanding was further developed in metallurgical laboratories. Pioneers at that time were Haneke, [10] Schmidtmann, [11,12] Meyer, [13,14] Kaspar, [15][16][17][18][19][20][21][22][23][24] Streißelberger, [9,15,[25][26][27] DeArdo, [28,29] Jonas, [30][31][32][33] Sellars, [34][35][36][37] Hodgson, [38][39][40][41][42] Tamura und Tanaka, [43] Saito, [44] Ouchi, [45] Militzer, [46,47] and many others. The basic idea was to improve the strength and toughness behavior of structural steels by grain refining. Compared to conventional hot rolling at high rolling temperatures, the new steels were rolled at lower final rolling temperature. It was found that repeated recrystallization of the austenite structures leads to a decrease of grain size, but there is a limit, which is difficult to overcome. Deformation at temperatures, where no recrystallization takes place was successful in the conditioning of austenite having a dense population of glide planes, high dislocation density, and a high intrinsic energy, which provided a high density of nucleation sites for the transformation products of austenite.At the beginning, mainly ferrite plus pearlite microstructures were considered and later the role of rapid cooling became an additional opportunity to increase the strength level.Higher cooling rates or higher undercooling increase the driving force and with a lower diffusivity a finer microstructure like bainite and martensite can be reached.A comparison of the contributions of the strengthening mechanism in a commercial hot rolle...

show abstract

Section: Successful Tmcp Applications For Flat Productsmentioning

confidence: 99%

Thermomechanical Treatment of Steels - A Real Disruptive Technology Since Decades

Buchmayr

2017

steel research int.

View full text Add to dashboard Cite

show abstract

Microstructure and mechanical properties of stainless steel 316L vertical struts manufactured by laser powder bed fusion process

Wang

Muñiz-Lerma

Sánchez-Mata

et al. 2018

Materials Science and Engineering: A

144

View full text Add to dashboard Cite

Flatness Feed-Forward Control Model Based on Neural Networks

Zhu

Zhang

et al. 2014

AMR

View full text Add to dashboard Cite

The influence on the shape of the strip from rolling force fluctuations has been analyzed. The combination of intermediate roll bending and work roll bending has been adopted. The principle of rolling force feed-forward control has been analyzed. The feed-forward control model has been established on the basis of neural networks. The model has been successfully applied to a rolling mill and a good effect has been achieved.

show abstract

Ultrafine Grained Steels with Improved Ductility Fabricated by Repetitive Thermo‐Mechanical Processing

Cited by 3 publications

References 15 publications

Thermomechanical Treatment of Steels - A Real Disruptive Technology Since Decades

Thermomechanical Treatment of Steels - A Real Disruptive Technology Since Decades

Microstructure and mechanical properties of stainless steel 316L vertical struts manufactured by laser powder bed fusion process

Flatness Feed-Forward Control Model Based on Neural Networks

Contact Info

Product

Resources

About