Workability of commercial-purity titanium and 4340 steel during equal channel angular extrusion at cold-working temperatures
Workability of commercial-purity titanium and 4340 steel during equal channel angular extrusion at cold-working temperatures
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DOI：
10.1007/s11661-999-0290-7
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发表时间：
1999-05
期刊：
影响因子：
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通讯作者：
S. Semiatin;D. P. Delo;V. Segal;R. Goforth;N. Frey
中科院分区：
文献类型：
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作者：
S. Semiatin;D. P. Delo;V. Segal;R. Goforth;N. Frey
在25 °C和325 °C之间的温度和0.002和2.0 s-1之间的有效应变速率下，测定了商业纯度（CP）钛（2级）和AISI 4340钢（回火至Rc 35）在等通道转角挤压过程中的变形和失效。CP钛合金在除低应变率和高温外的所有条件下均发生分段失效。相比之下，4340钢变形均匀，除了在最高温度和应变速率下，它也表现出分段故障。使用单轴压缩和拉伸试验的流动曲线和断裂数据，进行工作性分析，以确定断裂发生前的流动局部化导致的失效。这一结论得到了失败的挤压试样的金相检查证实。
The deformation and failure of commercial-purity (CP) titanium (grade 2) and AISI 4340 steel (tempered toRc35) during equal channel angular extrusion were determined at temperatures between 25 °C and 325 °C and effective strain rates between 0.002 and 2.0 s−1. The CP titanium alloy underwent segmented failure under all conditions except at low strain rates and high temperatures. By contrast, the 4340 steel deformed uniformly except at the highest temperature and strain rate, at which it also exhibited segmented failure. Using flow curves and fracture data from uniaxial compression and tension tests, workability analysis was conducted to establish that the failures were a result of flow localization prior to the onset of fracture. This conclusion was confirmed by metallographic examination of the failed extrusion specimens.