热加工对β-CEZ钛合金组织和力学性能的影响
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摘要
研究了镦拔工艺、挤压温度以及热处理对β-CEZ钛合金挤压管材显微组织和力学性能的影响,并讨论了热加工工艺与合金组织性能之间的联系规律。结果表明:多次镦拔细化了棒坯的显微组织,且相变点之下挤压获得的β-CEZ钛合金管材具有更好的强塑性匹配。随着固溶温度的升高,β-CEZ钛合金管材的强度增大、塑性降低,尤其断面收缩率下降明显;随着时效温度的升高,管材的强度降低,塑性增大。830℃挤压获得的β-CEZ钛合金管材经800℃×1 h/AC+600℃×8 h/AC热处理后,显微组织为细小均匀的等轴组织,且拉伸强度大于1 250 MPa,延伸率大于15%,强塑性匹配良好。
The effects of upsetting and drawing,extrusion temperature and heat treatment on the microstructure and mechanical properties of beta-CEZ titanium alloy tubes were studied by performance testing and microstructure observation,and with an emphasis on the relationship between the heat processing technique and microstructure and mechanical properties. The results show that the repeated upsetting and drawing can significantly refine the gains of beta-CEZ titanium alloy tube blank,and the mechanical properties of the titanium alloy tube which is extruded under phase transition temperature are much better than extruded above phase transition temperature. With the increase of solution temperature,the strength of tube increases and the plasticity decreases,especially the reduction of area; with the increase of aging temperature,the tensile strength and yield strength of tube decrease,while the elongation and reduction of area increase. Besides,by the heat treatment of 800 ℃ × 1 h/AC + 600 ℃ × 8 h/AC,the beta-CEZ titanium alloy tube extruded at 830 ℃ has a fine uniform equiaxed structure,the tensile strength is greater than 1 250 MPa,the elongation is greater than 15%,and the strength and plasticity are well matched.
The effects of upsetting and drawing,extrusion temperature and heat treatment on the microstructure and mechanical properties of beta-CEZ titanium alloy tubes were studied by performance testing and microstructure observation,and with an emphasis on the relationship between the heat processing technique and microstructure and mechanical properties. The results show that the repeated upsetting and drawing can significantly refine the gains of beta-CEZ titanium alloy tube blank,and the mechanical properties of the titanium alloy tube which is extruded under phase transition temperature are much better than extruded above phase transition temperature. With the increase of solution temperature,the strength of tube increases and the plasticity decreases,especially the reduction of area; with the increase of aging temperature,the tensile strength and yield strength of tube decrease,while the elongation and reduction of area increase. Besides,by the heat treatment of 800 ℃ × 1 h/AC + 600 ℃ × 8 h/AC,the beta-CEZ titanium alloy tube extruded at 830 ℃ has a fine uniform equiaxed structure,the tensile strength is greater than 1 250 MPa,the elongation is greater than 15%,and the strength and plasticity are well matched.
引文
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[14]尚秀丽,佟学文,晏小兵,等. TA15钛合金管材热加工工艺[J].中国有色金属学报,2010,20(专辑1):765-769.
[15]刘江林,曾卫东,杨建朝,等.冷轧工艺参数对TA18钛合金管材金属流动及成形载荷的影响规律[J].钛工业进展,2015,32(3):21-25.
[2]黄金昌.β-CEZ钛合金的加工性能和应用[J].钛工业进展,1996(5):34-37.
[3]张思远,毛小南,戚运莲,等.β-CEZ钛合金热变形本构关系的研究[J].热加工工艺,2016,45(1):108-112.
[4]Sukumar G,Bhav Singh B,Bhattacharjee A,et al. Ballistic impact behavior ofβ-CEZ Ti alloy against 7. 62 mm armour piercing projectiles[J]. International Journal of Impact Engineering,2013,54:149-160.
[5]Williams J C,Starke E A Jr. Process in structural materials for aerospace systems[J]. Acta Materialia,2003,51(19):5775-5799.
[6]江志强,杨合,詹梅,等.钛合金管材研制及其在航空领域应用的现状与前景[J].塑性工程学报,2009,16(4):44-50.
[7]王鼎春.高强钛合金的发展与应用[J].中国有色金属学报,2010,20(专辑1):958-963.
[8]汶建宏,杨冠军,葛鹏,等.β钛合金的研究进展[J].钛工业进展,2008,25(1):33-39.
[9]商国强,朱知寿,常辉,等.超高强度钛合金研究进展[J].稀有金属,2011,35(2):286-291.
[10]杜宇,刘伟,郭荻子,等. CT20钛合金挤压管坯冷轧过程中的组织演变[J].钛工业进展,2015,32(2):28-31.
[11]宁兴龙.钛合金管坯的斜轧穿孔[J].钛工业进展,1998(1):18-19.
[12]贾如雷,计波,吕维洁,等.钛材热挤压成形技术的研究与发展[J].中国有色金属学报,2010,20(1):897-901.
[13]张驰,曾卫东,李兴无,等.挤压参数对TC16合金紧固件冷挤压过程的影响[J].材料工程,2008,8:35-39.
[14]尚秀丽,佟学文,晏小兵,等. TA15钛合金管材热加工工艺[J].中国有色金属学报,2010,20(专辑1):765-769.
[15]刘江林,曾卫东,杨建朝,等.冷轧工艺参数对TA18钛合金管材金属流动及成形载荷的影响规律[J].钛工业进展,2015,32(3):21-25.