文章信息/Info

Title:

Custom-Designed Heat Treatment for 3D-Printed Single-Crystal Ni-Based Superalloys

文章編號:

1674-3962(2025)04-0380-07

作者:

林弈安; 王兆偉; 何衛鋒; 羅思海; 陳凱

1. 西安交通大學材料科學與工程學院，陜西 西安 710049 2. 空軍工程大學 航空動力系統與等離子體技術全國重點實驗室，陜西 西安 710038

Author(s):

LIN Yian;  WANG Zhaowei;  HE Weifeng;  LUO Sihai;  CHEN Kai

1. State Key Laboratory for Mechanical Behavior of Materials, Xi�餫n Jiaotong University, Xi’an 710049, China 2. National Key Lab of Aerospace Power System and Plasma Technology, Air Force Engineering University,Xi’an 710038, China

關鍵詞:

鎳基單晶高溫合金; 增材制造; 熱處理; 回復; 亞固相線固溶

Keywords:

single-crystal Ni-based superalloys;  additive manufacturing;  heat treatment;  recovery;  sub-solvus solutionizing

分類號:

TG132.3;TG665

DOI:

10.7502/j.issn.1674-3962.202309007

文獻標志碼:

A

摘要:

增材制造（3D打印）技術在鎳基高溫合金單晶葉片的修復領域展現出重要應用前景。該技術具有溫度梯度大、冷卻速度快等特點，有利于促進枝晶定向生長、實現枝晶組織細化，但是同時也容易產生高殘余應力、高位錯密度，從而在后續熱處理與高溫服役過程中引發再結晶、開裂等問題，造成極大的安全隱患。因此，需要對增材修復的鎳基高溫合金單晶開發定制化熱處理研究。高溫合金的標準熱處理一般由超固相線固溶、時效等步驟組成。以增材修復高溫合金單晶特有的微觀組織為出發點，提出“筏化�不貜汀奔啊皝喒滔嗑�固溶”策略，有效抑制再結晶及3D打印產生的雜晶晶粒生長，同時有效降低位錯密度、釋放應力、調控沉淀強化相組織，為實現單晶渦輪葉片的增材修復提供保障。

Abstract:

Additive manufacturing (3D printing) is a promising route to repair damaged Ni0based superalloy single crystal blades. This technology is featured by steep temperature gradient and high cooling rate. The characteristics favor the directional growth of dendrites and realise microstructure refinement. However, additive manufacturing process also produce high residual stress and high microstructural defect density, which will trigger disastrous recrystallization and cracking in the subsequent heat treatment and/or high temperature service process. Therefore, customized heat treatment is demanded for the 3D�瞤rinting repaired Ni0based superalloy single crystals. The standard heat treatment of superalloy generally consists of the steps of super0solvus solution and aging. Considering the unique microstructure of as0printed single crystal superalloys, the strategies of rafting0enabled recovery and sub0solvus solutionizing are demonstrated in this work, which effectively prevent recrystallization and stray grain growth, reduce dislocation density, release stress, and optimize γ′ morphology and volume fraction. Our study paves the way for the 3D0printing repair of damaged Ni0based superalloy single crystal turbine blades.