冷拉减面率对C形环用Inconel X-750丝材组织性能的影响

文章通过冷拉拔加工制备减面率为0%、30%、60%的Inconel X-750丝材,分别在650℃、730℃、810℃下时效处理16h,研究冷拉减面率对X-750合金组织性能的影响,特别是减面率对γ′相形状、分布、数量及尺寸的影响。经定量分析,增大冷拉减面率除了有细化晶粒的作用外,还能一定程度地增加γ′相析出的颗粒数量及体积分数,减小γ′相尺寸,进一步加强沉淀强化的作用。时效温度对X-750丝材的晶粒尺寸没有明显影响,对γ′相的数量、尺寸及形状影响较大。采用730℃时效处理16h的标准工艺制备的X-750丝材,经加工为弹簧后制造成金属C形密封环,其回弹量及泄漏率均满足要求,实验条件下密封性能良好。

Effect of Cold Drawn Area Reduction on Microstructure and Properties of Inconel X-750 Wire Used for C Ring

In order to study the effect of cold drawn area reduction ratio on microstructure and properties of Inconel X-750 alloy ,especially the effect on the shape ,distribution ,quantity and size of γ′ phase ,the X-750 wires which had 0% ,30% ,60%cross section reduction rate (CSRR) were prepared and subsequently aging-treated at 650 ℃ ,730 ℃ ,810 ℃ ,respectively .With the quantitative analysis ,aging temperature had little effect on grain size but great effect on the quantity ,size and shape of γ′ phase . Nevertheless ,CSRR had significant influence on the grain size of X-750 wires ,and it played a major role in fine grain strengthening . The quantity and volume fraction of γ′precipitate could be improved to some extent ,and the size could be diminished by increasing CSRR ,which resulted in enhancing further precipitation strengthening effect .The X-750 wires were aging-treated at 730 ℃ for 16 hours by standard process ,then after being processed into springs ,they were made into some C-rings finally .Under the given experimental conditions ,it was proved that both the rebound amount and leakage rate met the requirements and the sealing performance was favorable .