Optimizing a Solution Heat Treatment by Increasing the Cooling Rate of Directional Solidification for Ni-Based Superalloys

被引：4

作者：

Zhang, Yanbin ^{[1
,2
]}

Qin, Ling ^{[3
]}

Zhu, Bin ^{[2
]}

Jiang, Haijun ^{[2
]}

Tan, Li ^{[1
]}

Huang, Taiwen ^{[4
]}

Gan, Bin ^{[5
]}

Jie, Ziqi ^{[6
]}

Liu, Lin ^{[4
]}

机构：

[1] Chongqing Univ Technol, Coll Mat Sci & Engn, Chongqing 400054, Peoples R China

[2] Chongqing Iron & Steel Res Inst Co Ltd, Chongqing 400050, Peoples R China

[3] Univ Wyoming, Dept Petr Engn, Laramie, WY 82071 USA

[4] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China

[5] Cent Iron & Steel Res Inst, Beijing Key Lab Adv High Temp Mat, Beijing 100081, Peoples R China

[6] Xian Technol Univ, Sch Mat Sci & Chem Engn, Xian 710021, Peoples R China

来源：

MATERIALS | 2023年 / 16卷 / 09期

基金：

中国国家自然科学基金;

关键词：

Ni-based superalloy; solution heat treatment; solidification cooling rate; residual segregation; SINGLE-CRYSTAL SUPERALLOY; MICROSTRUCTURE; CREEP; HOMOGENIZATION; OPTIMIZATION; PHASE;

D O I：

10.3390/ma16093433

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The solution heat treatment (SHT) of the third generation of single crystal (SC) Ni-based superalloys required up to 45 h and was expensive. In this study, SHT based on liquid metal cooling (LMC) was optimized to greatly reduce processing time. The experimental and simulation results showed that residual segregation was evidently reduced, e.g., from 2.12 to 1.22 for the most heavily segregated Re. This led to a 16.7% increase in creep life, more uniform microstructures, and a decrease in solidification and homogenization porosity by a factor of 3.4. Structural refinement, approximately 0.32 times, served as the underlying mechanism for this optimization, which reduced diffusion distance and increased homogenization efficiency during SHT.

引用

页数：9

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