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摘要：
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对IN718合金进行近等温锻造实验。结果表明:近等温锻造IN718合金微观组织和拉伸性能对温度场敏感,对变形量和应变速率不敏感,有利于IN718合金近等温加工成形。当成形温度较低时(980℃),晶粒细小,间隙相以短棒状析出,分散程度高,塑性性能高,但是屈服强度低;当成形温度较高时(1060℃),晶粒粗大,仅在晶界处有间隙相以针状析出,塑性性能较低,但是屈服强度好转;在1020℃近等温锻造IN718合金,晶粒细小,短棒状间隙相在晶内析出、针状间隙相在晶界处析出,拉伸性能优越,针状间隙相对屈服强度贡献显著。
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Near isothermal forging holding in homogeneous temperature pattern from specimen to die was proposed for the economic production of complex-shaped components.The results indicate that microstructure and tensile properties are sensitive to the temperature pattern,and low sensitization of microstructure and tensile properties to deformation and strain rate is benefit to NIF of IN718 alloy.Fine microstructure and stick interstitial phase at high dispersion processed contribute to the excellent plasticity under SIF at low temperature(at 980℃).Coarse microstructure with interstitial phase precipitated as acerose in boundaries improves the yield strength obviously processed under SIF at high temperature(at 1060℃).Tensile properties of the IN718 alloy processed under NIF at 1020℃and heat treated condition are significantly improved with grain size ASTM 10.
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参考文献：
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