利用成分不良的TC4钛合金铸锭制备合格板材的工艺研究

Research on the Preparation of TC4 Titanium Alloy Plate by the Ingot with Bad Composition

为了充分利用某批因添加回收料较多而造成O含量较高或不均匀的TC4钛合金铸锭,以该批铸锭为研究对象,研究了不同锻造工艺对锻坯组织及成品板材力学性能的影响。结果表明:经三火次锻造获得的7 mm厚热轧板材的力学性能不稳定且有较多不合格;经六火次锻造可获得以等轴和短棒状α相为主的双态组织,轧制后得到的4.5mm厚成品板材的伸长率可达12.5%~19%,且强度较高;经四火次锻造可获得以长条状α相为主的组织,轧制后得到的4.5 mm厚成品板材性能合格,伸长率为12.5%~17%。综合分析知,通过四火次锻造加三火轧制可得到组织均匀、性能稳定的TC4钛合金成品板材,实现对O含量较高或波动较大的TC4钛合金铸锭的应用,且生产成本较低。

In order to obtain eligible TC4 titanium alloy plate by the ingot with high O content or inhomogenous composition, the effects of forging method on the microstructure and mechanical properties were investigated. The results show that the mechanical properties of 7 ram TC4 titanium alloy plate obtained by three-circle forging are unstability and more unqualified; the duplex microstructure including equiaxed and claviform alpha phases is obtained after six-circle forging, and the as-roiled 4.5 mm TC4 titanium alloy plate has high prolongation rate of 12. 5% - 19% and high strength; many stick alpha phases are obtained after four-circle forging, and the as-rolled 4.5 mm TC4 titanium alloy plate has prolongation rate of 12.5% - 17%, and the mechanical properties are application of TCA titanium alloy ingot with high O content or inhomogenous composition and three fire rolling can be used. By this technology, the TC4 titanium alloy plate stable mechanical performance can be get.