文章信息/Info

Title:

Study on Creep Deformation and Fracture Mechanism of GH3230 Alloy

文章編號(hào):

1674-3962(2025)04-0395-07

作者:

任曉東; 侯成; 許琦鵬; 周芳菁; 曾嘉迅; 楊思遠(yuǎn); 范學(xué)領(lǐng)

1. 西安交通大學(xué)航天航空學(xué)院 西安市極端環(huán)境服役性能與防護(hù)技術(shù)重點(diǎn)實(shí)驗(yàn)室，陜西 西安 710049 2. 中國(guó)航發(fā)湖南動(dòng)力機(jī)械研究所，湖南 株洲 412002

Author(s):

REN Xiaodong;  HOU Cheng;  XU Qipeng;  ZHOU Fangjing; ZENG Jiaxun;  YANG Siyuan;  FAN Xueling

1. Xi’an Key Laboratory of Extreme Environment and Protection Technology, School of Aerospace Engineering, Xi’an Jiaotong University, Xi’an 710049, China 2. AECC Hunan Aviation Powerplant Research Institute, Zhuzhou 412002, China

關(guān)鍵詞:

GH3230; 鎳基高溫合金; 修正θ參數(shù)法; 復(fù)合時(shí)間硬化模型; 蠕變變形

Keywords:

GH3230;  nickel-based superalloy;  modified θ parameter method;  composite time-hardening model;  creep deformation

分類號(hào):

TG132.3

DOI:

10.7502/j.issn.1674-3962.202310026

文獻(xiàn)標(biāo)志碼:

A

摘要:

作為新一代火焰筒材料，GH3230鎳基高溫合金在極端高溫高壓環(huán)境中服役時(shí)的蠕變性能尤其重要。開展了GH3230高溫合金在不同應(yīng)力、不同溫度（800，900和1000 ℃）下的蠕變實(shí)驗(yàn)，基于修正θ參數(shù)法和復(fù)合時(shí)間硬化模型對(duì)GH3230合金的蠕變變形進(jìn)行了預(yù)測(cè)分析，并對(duì)其高溫蠕變斷裂機(jī)理進(jìn)行了闡釋。結(jié)果表明，GH3230合金的蠕變壽命與溫度和應(yīng)力有關(guān)。溫度越高、應(yīng)力越大，合金的蠕變壽命越短。修正θ參數(shù)法在溫度和應(yīng)力均較高時(shí)能較好地預(yù)測(cè)蠕變變形，而復(fù)合時(shí)間硬化模型在溫度和應(yīng)力均較低時(shí)能較好地預(yù)測(cè)蠕變變形。GH3230合金的蠕變斷裂為孔洞聚集型的解理斷裂，斷裂路徑表明主要由晶界遷移主導(dǎo)，且蠕變溫度越高斷口韌窩尺寸越大。

Abstract:

As a new generation burner inner liner material, the creep properties of GH3230 nickel-based superalloy are particularly important when serving in extreme high temperature and high pressure environments. In this paper, the creep experiments of GH3230 superalloy under different stresses and temperatures(800, 900 and 1000 ℃) were conducted. The creep deformation of GH3230 alloy was predicted based on the modified θ parameter method and composite time-hardening model, and the high temperature creep fracture mechanism was explained. The results show that the creep deformation of GH3230 alloy is closely related to temperature and stress. The higher the temperature and stress, the shorter the creep life. The modified θ parameter method can predict the creep deformation better when the temperature and stress are high, while the composite time-hardening model can predict the creep deformation better when the temperature and stress are low. The creep fracture of GH3230 alloy is a cavity aggregation cleavage fracture, and the fracture path shows that it is mainly dominated by grain boundary migration, and the higher the creep temperature, the larger the fracture dimple size.