文章信息/Info

Title:

The Effect of Aging Treatment Temperature on Microstructure and Stress-Rupture Properties of a Fourth Generation Ni-Based Single Crystal Superalloy

文章編號:

1674-3962(2025)06-0561-07

作者:

李遠; 趙云松; 郭媛媛; 張劍; 楊振宇; 鄭帥; 劉晨光; 唐定中

北京航空材料研究院先進高溫結(jié)構(gòu)材料重點實驗室，北京，100095

Author(s):

LI Yuan;  ZHAO Yunsong;  GUO Yuanyuan;  ZHANG Jian;  YANG Zhenyu;  ZHENG Shuai;  LIU Chenguang;  TANG Dingzhong

Science and Technology on Advanced High Temperature Structural Materials laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China

關鍵詞:

鎳基單晶高溫合金; 時效處理; 顯微組織; 高溫持久性能; 斷口形貌

Keywords:

Ni-based single crystal superalloy;  aging treatment;  microstructure;  high temperature stress-rupture property;  fracture morphology

分類號:

TG132.3+2；TG156.92

DOI:

10.7502/j.issn.1674-3962.202310003

文獻標志碼:

A

摘要:

為探究一次時效溫度對一種第四代鎳基單晶高溫合金顯微組織和高溫持久性能的影響，使用高分辨率場發(fā)射掃描電鏡和金相顯微鏡對合金熱處理前后顯微組織、高溫持久斷口形貌和斷后剖面顯微組織進行觀察。結(jié)果表明：固溶處理可以使（γ+γ′）共晶組織基本消除，合金元素的偏析程度明顯減輕。一次時效處理改變γ′相尺寸與形貌，一次時效溫度升高使枝晶干γ′相尺寸增加、立方度降低，γ基體通道寬度增加。隨著一次時效溫度升高，合金在1120 ℃/137 MPa條件下的持久壽命降低。合金持久性能與γ′相形貌尺寸、體積分數(shù)及γ基體通道寬度密切相關。尺寸合適且立方度高的γ′相對位錯有較強阻礙作用，且位錯在γ基體通道內(nèi)滑移所需的Orowan應力與基體通道寬度呈反比。通過綜合對比評估，確定了該合金最佳一次時效溫度為1140 ℃。

Abstract:

To investigate the influence of primary aging temperature on the microstructure and stress-rupture properties of a fourth-generation Ni-based single-crystal superalloy, high-resolution field emission scanning electron microscopy and optical microscopy were employed to characterize microstructural evolution during heat treatment, high-temperature stress�瞨upture fracture morphology and microstructure of cross-sections. The results revealed that solution treatment effectively eliminated (γ+γ′) eutectic structures and substantially reduced elemental segregation. Primary aging modified γ′ precipitate size and morphology, where increasing temperature promoted γ′ coarsening in dendritic areas, diminished cuboidal integrity and widened γ matrix channels. Consequently, elevated primary aging temperatures reduced the stress-rupture life at 1120 ℃/137 MPa. The stress�瞨upture performance exhibited critical dependence on γ′ precipitate morphology, size, volume fraction and γ channel width. Optimally sized, highly cuboidal γ′ precipitates strongly impeded dislocation motion, while the Orowan stress for dislocation glide within γ channels demonstrated inverse proportionality to channel width. Comprehensive evaluation established 1140 ℃ as the optimal primary aging temperature for this alloy.