热处理工艺对Inconel718合金组织、力学性能及耐蚀性能的影响

对高含H2S/CO2酸性油气田封隔器材料-Inconel718镍基合金进行固溶处理和时效处理,研究不同热处理工艺条件下合金的组织、力学性能、耐蚀性能之间的关系。结果表明:随着固溶温度的升高,δ相不断溶入基体。材料经时效处理后析出第二相γ″相,硬度和强度明显高于固溶处理的样品,1000℃固溶+720℃×8h→50℃/h620℃×8h时效处理的样品硬度和强度达到最大值。高温高压H2S/CO2介质中挂片实验的结果表明,不同热处理的Inconel718合金均具有良好的耐腐蚀性能,经固溶处理的材料耐腐蚀性略优于经固溶+时效处理的材料。高温高压H2S/CO2应力腐蚀实验的结果表明,Inconel718没有发生应力腐蚀开裂迹象。综合考虑耐蚀性能和力学性能,确定Inconel718合金的最佳热处理工艺为:1000℃固溶1h+720℃×8h→50℃/h620℃×8h时效。

Effect of Heat Treatment Technology on Microstructure,Mechanical Property and Corrosion Resistance of Nickel-base Alloy Inconel718

Research on the microstructure,mechanical property and corrosion resistance of nickel-base alloy,Inconel718 after application of different heat treatment techniques was carried out.The result indicates that,as temperature increasing,the grain grows up and the phase δ dissolves into the matrix.After aging,the phase γ" precipitates from the alloy.The hardness of the alloy,as a result,becomes higher than that of the alloy after being subjected to the solid solution treatment.After the solid solution treatment at 1000℃ and aging,the hardness and yield strength reach the maximum.Corrosion test indicates that the nickel-base alloy,Inconel718 possesses excellent corrosion resistance regardless of heat treatment.The stress corrosion test under the atmosphere of H2S/CO2 at high temperature and pressure shows that there is no crack in the alloy Inconel718.