摘要
对IN718合金进行近等温成形,研究了始锻温度、变形和应变速率对锻件拉伸性能的影响。结果表明:始锻温度对拉伸性能的影响最显著;随着始锻温度的升高合金的晶粒度水平降低。间隙相的形态和含量是影响拉伸性能的直接原因,含量适当的针状初生态间隙相对拉伸性能的提高十分有力,而短棒状长大后的间隙相对拉伸性能的作用较低。间隙相的长大与合金的位错密度和成形温度关系密切。在间隙相的完全析出条件下,即在能量和温度的公共作用下,针状初生相迅速长大成短棒状;而在不完全的间隙相析出条件下,间隙相仅在变形后期析出并且不发生长大,保持初生的针状形态。
Near-isothermal forging were carried out on IN718 alloy to study the effect of parameters,i.e.temperature,deformation and strain rate,on microstructure and mechanical properties.Mechanical properties were affected by the deformation temperature since the grain coarsening with increasing temperature.And it should be pointed that the mechanical property was significantly effected by the shape and volume of interstitial phase.Acerose phase with suitable in volume was contributed to optimal property.Growth up of the interstitial phase was related to dislocation density and temperature.Under full-precipitation condition,acerose phase grew up to short-stick-shape.But under non-full-precipitation condition,acerose phase only precipitated at the final stage of the deformation and reserved acerose shape.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2010年第11期1-4,共4页
Journal of Materials Engineering
关键词
近等温锻造
IN718合金
力学性能
间隙相
near-isothermal forging
IN718 alloy
mechanical properties
interstitial phase
