K417G高温合金中Mn的存在形式和分布及Mn含量对高温持久性能的影响  

Existence Form and Distribution of Mn and the Effect of Mn Content on High-Temperature Stress Rupture Properties of K417G Superalloy

作　　者：杨亚倩 邢炜伟 陈伟亮[2] 陈波[1] 马颖澈[1] 刘奎[1] Yang Yaqian;Xing Weiwei;Chen Weiliang;Chen Bo;Ma Yingche;Liu Kui(Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;Northeastern University,Shenyang 110819,China)

机构地区：[1]中国科学院金属研究所师昌绪先进材料创新中心,辽宁沈阳110016 [2]东北大学,辽宁沈阳110819

出　　处：《稀有金属材料与工程》2021年第10期3470-3476,共7页Rare Metal Materials and Engineering

摘　　要：研究了Mn含量在0.09%~0.35%(质量分数)范围内变化对K417G高温合金的高温持久性能的影响,并且探究了Mn的存在形式和分布情况。结果表明,Mn固溶于γ基体中,并偏聚于γ+γ’共晶帽前沿的γ’贫化区的基体中。Mn元素促进了Al和Ti元素向枝晶间区域的偏析,从而增加了枝晶间区域γ+γ’共晶的体积分数,减小了枝晶干中γ’相的尺寸。随着Mn含量的增加,在950℃/235 MPa的条件下,合金的持久寿命和塑性均大大降低。Mn含量最小的合金具有最佳的高温持久性能。The high-temperature stress rupture properties of K417 G superalloy with various Mn contents(0.09 wt%-0.35 wt%)were studied and the existence form and distribution of Mn were evaluated as well.The results show that Mn is solid-dissolved inγmatrix and enriched inγ’-depleted matrix in front ofγ+γ’eutectic cap.Mn elements promote the segregation of Al and Ti to interdendrite zone,thus increasing the volume fraction ofγ+γ’eutectic in interdendrite zone and decreasing the size ofγ’phase in dendrite core.With the increase of Mn content,the stress rupture life and the plasticity decrease greatly under the condition of 950℃/235 MPa.The alloy with the minimal Mn content shows the optimal high-temperature stress rupture properties.

关 键 词：MN含量 显微偏析 持久性能 存在形式 K417G 

分 类 号：V263[航空宇航科学与技术—航空宇航制造工程] TG132.3[一般工业技术—材料科学与工程]