Phosphorus Segregation in Meta-Rapidly Solidified Carbon Steels

2017 ◽  
Vol 36 (9) ◽  
pp. 905-912
Author(s):  
Na Li ◽  
Jun Qiao ◽  
Junwei Zhang ◽  
Minghong Sha ◽  
Shengli Li
Keyword(s):  
Rolling Force ◽  
Solidification Process ◽  
Carbon Steels ◽  
Phosphorus Segregation ◽  
Negative Segregation ◽  
Roll Casting ◽  
Segregation Of Alloying Elements ◽  
Solidification Speed ◽  
Roll Separating Force ◽  
Twin Roll

AbstractTwin-roll strip casters for near-net-shape manufacture of steels have received increased attention in the steel industry. Although negative segregation of phosphorus occurred in twin-roll strip casting (TRSC) steels in our prior work, its mechanism is still unclear. In this work, V-shaped molds were designed and used to simulate a meta-rapid solidification process without roll separating force during twin roll casting of carbon steels. Experimental results show that no obvious phosphorus segregation exist in the V-shaped mold casting (VMC) steels. By comparing TRSC and the VMC, it is proposed that the negative phosphorus segregation during TRSC results from phosphorus redistribution driven by recirculating and vortex flow in the molten pool. Meanwhile, solute atoms near the advancing interface are overtaken and incorporated into the solid because of the high solidification speed. The high rolling force could promote the negative segregation of alloying elements in TRSC.

Strip properties and processing in twin roll casting of stainless and low carbon steels

2001 ◽  
Vol 72 (11-12) ◽  
pp. 490-495 ◽  
Author(s):  
Hans-Ulrich Lindenberg ◽  
Gabriele Brückner ◽  
Karl-Heinz Tacke
Keyword(s):  
Carbon Steels ◽  
Low Carbon ◽  
Low Carbon Steels ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Twin Roll

scholarly journals Simulation of Solidified Microstructure and Experimental Comparative Study of Twin-Roll Casting Aluminum Alloys

2017 ◽  
Vol 2017 ◽  
pp. 1-7
Author(s):  
Teng Ma ◽  
Junting Zhang ◽  
Xiaochao Cui ◽  
Xiaosi Sun
Keyword(s):  
Aluminum Alloys ◽  
Solidification Process ◽  
Tensile Tests ◽  
Metallographic Examination ◽  
Twin Roll Casting ◽  
Dendrite Arm Spacing ◽  
Roll Casting ◽  
Cellular Automaton Method ◽  
Casting Aluminum ◽  
Twin Roll

A coupled macro-micro mathematical model of twin-roll casting was established in the study. The continuous solidification process of Al-10Mg aluminum alloys in front of the nip point was numerically simulated by the cellular automaton method and the solidification microstructure, dendritic grain radius, and secondary dendrite arm spacing were obtained through simulation to predict the mechanical property of wedge strips. In order to verify the reliability of the simulation results, the metallographic examination and tensile tests were performed with the as-cast specimens. The results showed that the gain size, the distribution characteristics of various grain regions, dendrite arm spacing, and the yield strengths obtained from simulation were consistent with experimental results.

scholarly journals Role of Roll Separating Force in High-Speed Twin-Roll Casting of Aluminum Alloys

Metals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 645 ◽  
Author(s):  
Min-Seok Kim ◽  
Hyoung-Wook Kim ◽  
Su-Hyeon Kim ◽  
Shinji Kumai
Keyword(s):  
Aluminum Alloys ◽  
Casting Speed ◽  
High Speed ◽  
Rolling Texture ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Fine Microstructure ◽  
Roll Separating Force ◽  
Twin Roll

The role of the roll separating force in the high-speed twin-roll casting of aluminum alloys was examined. In horizontal-type twin-roll casting, as the casting speed increased upon decreasing the roll separating force, the strip texture changed from a shear and rolling texture to a random texture. Direct temperature measurements during high-speed twin-roll casting showed that the roll separating force played a significant role in maintaining a good contact between the strip and the roll surface. This resulted in a high cooling rate around the roll nip and enabled the fabrication of a sound strip with a fine microstructure. Moreover, the high casting speed and lowered roll separating force gave a band structure consisting of fine globular grains in the mid-thickness region of the strip, which could be considered beneficial in the formation of a well-dispersed center segregation.

A Versatile Thermal-Mechanical Model for Twin-Roll Casting

1999 ◽  
Author(s):  
A. A. Tseng ◽  
C. Chaidilokpattanakul ◽  
J. S.-J. Chen
Keyword(s):  
Experimental Data ◽  
Material Properties ◽  
Mechanical Model ◽  
Strip Thickness ◽  
Operating Conditions ◽  
Twin Roll Casting ◽  
Roll Pressure ◽  
Roll Casting ◽  
Roll Separating Force ◽  
Twin Roll

Abstract Twin-roll casting has been widely used for producing thin strips and sheets. In twin-roll casting, molten metal is fed into the gap of a pair of counter-rotating, water-cooled rolls. In this paper, the development of a semi-analytical model of the thermal-mechanical behavior is presented. A mechanical model is coupled with thermal models to predict roll pressure distribution and roll separating force. To demonstrate its versatility and reliability, the results predicted by this model are compared with experimental data available in the literature and good agreements have been found between this modeling results and experimental observation. Also, for given operating conditions and material properties, the closed-form relationship between productivity and strip thickness has been established.

scholarly journals Study on Development of Novel Mg-Based Alloys by Rapid Solidification Technology of Twin Roll Casting

2019 ◽  
Vol 804 ◽  
pp. 23-27
Author(s):  
Hai Jian Wang ◽  
Zhi Pu Pei ◽  
Dong Ying Ju
Keyword(s):  
Electron Microscope ◽  
Rapid Solidification ◽  
Amorphous Phase ◽  
Solidification Process ◽  
Element Distribution ◽  
High Concentration ◽  
Cooperative Research ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Twin Roll

In this study, Mg-based alloys were prepared by rapid solidification of twin roll casting (TRC), then microstructure and element distribution were investigated respectively with Scanning Electron Microscope (SEM) and Electron Probe Micro Analyzer (EPMA). What’s more, in order to analyze microstructure and crystal structure of Mg-based alloys, experiments on specimens with the usage of X-ray diffraction (XRD) and Transmission Electron Microscope (TEM) were also carried out. At last, the designed Mg-Re magnesium alloy with quasi-amorphous phase plus fine crystalline phase dual phase microstructure produced with our rapid solidification of TRC process. The rapid solidification process realized with a faster casting speed and a thinner roll gap that does not need any anther additional devices and vacuum environment. EPMA results and TEM analyses show that the quasi-amorphous phase has a high concentration in Al and RE element. There are quasi-amorphous phase in the middle of Mg-Re alloy cross section surrounded by dendrites phase and normal crystals. Acknowledgement. This work was supported by Cooperative Research and Development Center for Advanced Materials (CRDAM) funded by the Institute for Materials Research (IMR), Tohoku University (Project Number 18G0042).

Study of the Structural Properties and Segregation of Alloying Elements in Strips from the TRC Line

2016 ◽  
Vol 682 ◽  
pp. 38-45
Author(s):  
Wojciech Ściężor ◽  
Andrzej Mamala ◽  
Paweł Kwaśniewski ◽  
Radosław Kowal ◽  
Justyna Grzebinoga
Keyword(s):  
Cold Rolling ◽  
Structural Properties ◽  
Electric Properties ◽  
Alloying Elements ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Segregation Of Alloying Elements ◽  
Twin Roll ◽  
To Receive

Twin roll casting (TRC) technology is becoming increasingly popular because of the opportunity to receive aluminum strips which may serve as input for direct cold rolling processes. Furthermore, these strips have a favourable combination of mechanical and electric properties as well as dimensional tolerances. TRC line strips show segregation of alloying elements and structure providing a combination of casting structure and wrought alloy. As part of this study, the structure of the strips from the TRC line has been analyzed as well as the segregation of the alloying elements.

Sign in / Sign up

Export Citation Format

Share Document