冷轧加工不仅可以实现小规格丝材尺寸的高精度控制,也可以满足对组织和性能有特殊要求的丝材加工.通过对比分析冷连轧和热拉拔两种加工方式制备出的TC16钛合金丝材的性能和组织,研究了冷连轧工艺对TC16钛合金丝材退火态和固溶时效态性能的影响.结果表明,冷连轧获得的TC16钛合金丝材经退火后的抗拉强度比热拉拔加工丝材低,但是塑性较高,更有利于后续TC16钛合金紧固件的冷镦制成形;经过热处理强化后,冷连轧获得的TC16钛合金丝材强化效果明显,抗拉强度提高和塑性降低程度更为显著.相比热拉拔加工,冷连轧可有效破碎纵向长条α相并储存更多的加工畸变能,是获得优良退火态塑性和增强热处理强化作用的主要原因.
TC16 Alloy wire which has high-precision dimension controlling and meets the special requirement of microstructures and mechanical properties was obtained by cold rolling.In this paper, the effects of cold tandem rolling on M and STA mechanical of TC16 alloy wire were investigated through comparative study of TC16 alloy wire prepared by cold tandem rolling and hot-draw.The results show that the M state tensile and yield strength of TC16 alloy wire obtained by cold tandem were lower, while the ductility was higher, and this benefits the subsequent cold heading formability.The result of solid solution for TC16 Alloy wire prepared by cold tandem rolling was evidenced, the tensile strength has been increased and the ductility has been reduced more drastically.Because the cold tandem rolling can break down elongated phase α of vertical microstructure and store more machining deformation, it makes significant contributions to ductility by annealed and solution strengthening by thermal treatment.
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