退火工艺对lnconel718合金组织及性能影响

打开文本图片集

Abstract：This article studies the influence of diferent annealing processes on the microstructure and properties of Inconel718alloy ingots through computational simulationcombined with experiments.Conductannealing treatment at 850°C ， 900°C ，and 950°C for 5 hours on as cast and forged samples，and analyze the microstructure evolution， residual stres，and hardness changes.Experiments havefound that afterannealing Inconel718alloy，the hardness gradually decreases with increasing annealing temperature. The precipitated phases（γ'，γ"， δ phase）of both cast and forged alloys undergo dissolution or transformation with increasing annealing temperature. The shape shows that at 850°C ，a large amount of γ′ phase dissolves，at 900°C ，a portion of γ" phase transforms into δ phase， and a large amount of δ phase precipitates and grows. At 950°C ，the γ" phase basically dissolves and the content of δ phase decreases.Residual stress testing shows that the 950∘C×5h process can effectively reduce residual stress and transform it into acompressive stresstate.Research has shown that precipitation is an important factor affecting residual stress，and controlling the content of γ′ phase，γ" phase，and δ phase through annealing treatment can weake dislocation pinning，eliminatedefect stressconcentration，effectively reduce residual stress，and avoid crack occurrence.This study provides experimental evidence for residual stress control of Inconel 718 aloy ingots.

Keywords： residual stress; nickel based aloys; annealing; precipitation phase; mechanical property

1 序言

Incone1718镍基高温合金作为一种时效强化型镍基变形高温合金[1]，凭借其卓越的高温力学性能与耐蚀性、优秀的焊接性能、良好的加工性能、出色的抗氧化性能，以及较低的膨胀系数，在航空航天、能源电力、石油天然气开采、汽车工业及模具制造等众多领域中得到了极为广泛的应用[2，3]。（剩余8634字）