β相区热处理对TC4-DT合金板材组织和性能的影响
Effect of Heat Treatment in β Area on Microstructures and Properties of TC4-DT Alloy Sheet
叶红川1, 王彦皓1, 张雪华2, 曲恒磊1
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作者单位：(1. 西部钛业有限责任公司, 陕西 西安 710201; 2. 西部金属材料股份有限公司, 陕西 西安 710201)
中文关键字：热处理； 组织； 固溶； 性能
英文关键字：heat treatment; microstructure; solution; property
中文摘要：对TC4-DT合金板材在β相区热处理后的组织及性能进行了研究。结果表明：α相在晶内和晶界呈片状或针状析出，冷速越大，组织越细密，再经两相区处理后，组织趋于稳定化。随固溶时冷却速度的提高，合金板材室温强度逐渐提高，塑性变化不大。经990 ℃ × 45 min，WQ + 940 ℃ × 1 h，AC + 540 ℃ × 6 h，AC热处理得到的板材综合室温拉伸性能较好。
英文摘要：The microstructure and mechanical properties of TC4-DT alloy sheet heat-treated in β area were studied. The results show that a phase shows platelet or acicular inside the grain or at the grain boundary. The higher the cooling rate, the smaller the microstructure. And with the following α-β area heat treatment, the microstructure becomes stable. With the increase of cooling rate in solution treating, the tensile strength at room-temperature turns stronger, and the ductility doesn't changes obviously. The alloy sheet heat-treated at 990 ℃for 45 min, WQ and at 940 ℃ for 1 h，AC and then at 540 ℃for 6 h，AC has good room-temperature tensile property.