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Inconel 718合金经过热锻、δ相析出处理及再结晶热处理后,分别采用最大m值法和基于最大m值的应变诱发超塑性法进行高温拉伸试验,研究形变热处理及拉伸工艺对材料超塑性能的影响。结果表明,经过热变形、δ相析出及再结晶退火处理后,有效细化了Inconel 718合金的组织。析出的δ相可以在再结晶退火及热变形中起到控制晶界的作用。在950℃变形,采用上述两种方法拉伸变形得到的延伸率分别为566%和340%,说明基于最大m值的形变诱发超塑法可以进一步提高Inconel 718合金的延伸率。
Inconel 718 alloy after hot forging, δ precipitation and recrystallization heat treatment, respectively, using the maximum m value method and strain-induced superplasticity method based on the maximum m value for high temperature tensile test to study the effects of deformation heat treatment and drawing on the material super Effect of plastic properties. The results show that the microstructure of Inconel 718 alloy is effectively refined after hot deformation, δ phase precipitation and recrystallization annealing. The precipitated δ phase can play the role of grain boundary control in recrystallization annealing and thermal deformation. After deformation at 950 ℃, the tensile elongation obtained by the above two methods is 566% and 340%, respectively. This shows that the deformation induced superplasticity method based on maximum m can further improve the elongation of Inconel 718 alloy.