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Effect and mechanism of process parameters on microstructure and properties of Cu-Ni-Si alloy prepared by temperature controlled mold continuous casting

机译：工艺参数对温度控制模具连续铸造Cu-Ni-Si合金微观结构和性能的影响及机理

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摘要

C70250 copper alloy rod billets with O20mm were prepared by a self-developed temperature controlled mold continuous casting (TCMCC) technique. The evolution of microstructure and mechanical properties of rod billet at different casting speeds and mold temperatures was investigated. The influence mechanism of different process parameters on microstructure and properties of rod billet was revealed. The results show that C70250 copper alloy rod billets with / shape inclined columnar grains and equiaxed grains mixed structure are prepared when the melt temperature is 1200 degrees C, the cooling water temperature is 20 degrees C, cooling water flow rate is 400Lh(-1), the casting speed is 10 approximate to 50mm/min and the mold temperature is 1050 approximate to 1090 degrees C. When the casting speed increases from 10mm/min to 50mm/min, the average grain size of columnar grains increases from 0.72mm to 1.43mm gradually, and the number of equiaxed grains decreases gradually. Besides, the tensile strength of the rod billet decreases from 305MPa to 252MPa, and the elongation increases from 33.5% to 42.1%. When the mold temperature increases from 1050 degrees C to 1090 degrees C, the average grain diameter of columnar grains increases from 0.72mm to 1.43mm gradually, and the number of equiaxed grains reduces gradually. Besides, the tensile strength of the rod billet decreases from 326MPa to 275MPa, and the elongation increases from 31.2% to 41.2%. With the increase of casting speed and mold temperature, the number of nucleation on the mold wall reduces, and the average grain diameter of columnar grains increases, which reduces the number of grain boundaries per unit area. Therefore, the tensile strength of C70250 copper alloy increases and the elongation decreases.
机译：C70250通过自发温控模具连续铸造（TCMCC）技术制备具有O20mm的C70250铜合金棒坯。研究了在不同浇铸速度下杆坯组织和力学性能的演化和模具温度。揭示了不同工艺参数对钢坯微观结构和性能的影响机理。结果表明，当熔体温度为1200摄氏度时，制备C70250铜合金棒坯和等轴晶粒和等轴晶粒混合结构，冷却水温度为20℃，冷却水流速为400LH（-1 ），铸造速度为10近似为50mm / min，模具温度为1050°近似为1090℃。当铸造速度从10mm / min增加至50mm / min时，柱状晶粒的平均晶粒尺寸从0.72mm增加到1.43mm逐渐，等轴晶粒的数量逐渐降低。此外，杆坯料的拉伸强度从305MPa降至252MPa，伸长率从33.5％增加到42.1％。当模具温度从1050℃升高至1090℃时，柱状晶粒的平均粒径逐渐增加至1.43mm，并且等轴晶粒的数量逐渐减少。此外，杆坯料的拉伸强度从326MPa降至275MPa，伸长率从31.2％增加到41.2％。随着铸造速度和模具温度的增加，模具壁上的成核数量减少，柱状晶粒的平均粒径增加，这减少了每单位面积的晶界数。因此，C70250铜合金的拉伸强度增加，伸长率降低。

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