High Temperature Flow Behavior, Microstructure and Properties of Twin-Roll Strip Casting CuCrZr Alloy AITranslate

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Basic Information:

DOI：10.13373/j.cnki.cjrm.XY25060002

Chinese Library Classification Number:TG3

Citation Information:

As a high-performance copper-based alloy, CuCrZr alloy is widely used in electronic information, rail transit, aerospace, and other fields due to its excellent mechanical and thermoelectric properties. However, traditional preparation processes such as casting and extrusion face urgent needs such as improving production efficiency, shortening process flow, and reducing production costs. Although additive manufacturing technology can achieve near-end forming at the component level, due to the high reflectivity and rapid heat dissipation characteristics of copper alloys to infrared lasers, the improvement of tissue density and process stability faces important challenges. The rapid solidification and plastic deformation in twin-roll casting technology are carried out simultaneously, which is helpful to realize the synergistic improvement of microstructure and properties, and has outstanding advantages such as high efficiency, short process, and low energy consumption. It can provide the possibility for high efficiency and a short process of continuous forming of CuCrZr alloy. However, the high temperature deformation behavior of CuCrZr alloy after solidification is still unclear, and there is a lack of theoretical guidance for equipment load evaluation and process parameter control. The twin-roll casting process has high temperature and low strain rate, but the existing research on the flow behavior of CuCrZr alloy mostly focuses on the high strain rate conditions below 850 ℃, where the flow stress close to the liquidus is small, and the test is very difficult. Based on the Arrhenius model, the functional relationship between the flow stress, strain rate, and deformation temperature of the material can be established, which can describe the flow behavior of the material during high temperature deformation. However, the material parameters α, n, Q, and lnA are simplified by the average value, and the variation with the deformation temperature and strain rate is not taken into account, which cannot meet the prediction requirements of the high temperature flow behavior of the near liquid phase. It is urgent to improve the accuracy of the constitutive model, guide the optimization of the roll-casting process window, and reduce the process exploration cycle. To explore the flow behavior of CuCrZr alloy under high temperature conditions, the high temperature compression properties of CuCrZr alloy were tested by Gleeble-3800 test equipment at deformation temperatures of 650~950 ℃ and strain rates of 0.01~10 s^-1. The activation energy and material parameters were regarded as functions of temperature and strain rate. The high temperature flow stress model of CuCrZr alloy based on parameter parameter-compensated Arrhenius equation was established. The predicted values of the model were in good agreement with the experimental values. The correlation coefficient r and the average absolute relative error（AARE）were 0.99617 and 4.2%, respectively. To explore the suitable twin-roll casting process window, the peak stress at the deformation temperature of 650~1050 ℃ was predicted based on the constitutive model. At the same time, based on the predicted peak stress, the change law of peak stress at different deformation temperatures and strain rates was compared and analyzed. In the twin-roll casting process, the molten pool was narrow and closed, accompanied by high-temperature solidification and plastic deformation, which made it difficult to detect the temperature of the casting zone. The outlet temperature of the casting zone was usually used as one of the key detection indicators. The cast-rolling zone's outlet temperature determined the material's deformation resistance, which ultimately affected the twin-roll casting process. Therefore, this paper used the outlet temperature of the hot rolling deformation zone as the key parameter for analysis. Based on the outlet temperature parameters of the hot rolling deformation zone, this paper calculated the variation law of rolling force corresponding to the outlet temperature under different parameters. Based on the above analysis, the variation law of the predicted deformation resistance was summarized. The results showed that when the deformation temperature was greater than 910 ℃, the change of the deformation resistance was relatively stable. When the deformation temperature was lower than 910 ℃, the deformation resistance would increase rapidly with the decrease of the deformation temperature and the increase of the strain rate. The law could provide a theoretical basis for the selection of mechanical parameters and process optimization of twin-roll casting equipment. Finally, CuCrZr alloy strip was successfully trial-produced based on Φ160 mm×150 mm twin-roll casting equipment. The grain distribution characteristics of the molten pool in the cast-rolling zone were obtained using an electronic universal material testing machine, Optical microscopy（OM）, Scanning electron microscopy（SEM）, and other characterization and testing methods. The tensile strength of CuCrZr alloy strip reached 431 MPa by room temperature tensile test, and the tensile strength met the medium evaluation of DIN 17666-1983 standard. The results showed that the microstructure and compactness of CuCrZr alloy strip by twin roll casting were good, which proved the feasibility of short process near net shape forming of CuCrZr alloy by twin roll casting technology.