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介绍了油井管用镍基耐蚀合金G-3的国内外研究现状,并进一步研究了该合金在750℃长期时效后的组织变化。结果表明,长期时效后G-3合金晶内会析出第二相,从而降低合金的耐腐蚀性能。采用数值模拟技术对G-3合金管材的热挤压成形过程进行了模拟分析。结果表明,最大挤压力随着挤压速度的增加先升后降、随着坯料预热温度的升高而逐渐降低;坯料最大温升随着挤压速度的增加而增加,随着坯料预热温度的升高而降低。
This paper introduces the domestic and foreign research status of Ni-based corrosion resistant alloy G-3 for oil well, and further studies the microstructure of the alloy after long-term aging at 750 ℃. The results show that the second phase precipitates in the G-3 alloy after aging, reducing the corrosion resistance of the alloy. The hot extrusion forming process of G-3 alloy pipe was simulated by numerical simulation. The results show that the maximum extrusion pressure increases first and then decreases with the increase of extrusion rate and decreases with the increase of preheating temperature. The maximum temperature rise of blank increases with extrusion speed. With the increase of extrusion speed, Reduced heat temperature.