GH4151合金热变形过程中裂纹的扩展

兰州理工大学学报 ›› 2023, Vol. 49 ›› Issue (6): 28-32.

GH4151合金热变形过程中裂纹的扩展

刘建军¹, 魏保林¹, 贾智^1,2, 丁雨田^*1,2

1.兰州理工大学材料科学与工程学院, 甘肃兰州 730050;
2.兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室, 甘肃兰州 730050

收稿日期:2023-04-10 出版日期:2023-12-28 发布日期:2024-01-05
通讯作者: 丁雨田(1962-),男,甘肃榆中人,博士,教授.Email:dingyt@lut.edu.cn
基金资助:
国家自然科学基金(52265049),甘肃省高等学校产业支撑计划(2022CYZC-26)

Crack propagation in GH4151 alloy during hot deformation

LIU Jian-jun¹, WEI Bao-lin¹, JIA Zhi^1,2, DING Yu-tian^1,2

1. School of Materials Science and Engineering, Lanzhou Univ. of Tech., Lanzhou 730050, China;
2. State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou Univ. of Tech., Lanzhou 730050, China

Received:2023-04-10 Online:2023-12-28 Published:2024-01-05

摘要/Abstract

摘要： GH4151合金是一种服役于800 ℃以上的新型难变形镍基高温合金.由于铸态GH4151合金化程度高,晶粒尺寸大,在热变形过程中容易出现裂纹而无法进行开坯等变形.采用Gleeble-3500热模拟试验机对GH4151合金进行不同温度和应变速率下的热变形试验.利用电子背散射衍射(EBSD)和扫描电子显微镜(SEM)对其典型裂纹区域进行表征,分析了晶粒取向、再结晶、低能晶界以及固溶相对裂纹扩展的影响.结果表明:取向为〈101〉的晶粒相比于〈001〉和〈111〉取向晶粒能有效阻碍裂纹的扩展.再结晶晶粒的形成降低了合金中的应力,从而降低了裂纹扩展速率.低能晶界比随机晶界对裂纹的扩展具有更强的阻碍作用,并且在三叉晶界处低能晶界数量越多,阻碍作用越强.具有脆性特征固溶相的形成促进了裂纹的扩展.

关键词: GH4151合金, 热变形, 裂纹, 扩展机制

Abstract: GH4151 alloy is a new type of nickel-base superalloy that is difficult to deform and can be used above 800 ℃. Due to the high alloying degree and large grain size of as-cast GH4151, it is easy to crack during hot deformation and can not be deformed such as cogging. The hot deformation behavior of GH4151 alloy at different temperatures and strain rates was investigated by the Gleeble-3500 thermal simulator. Electron backscatter diffraction (EBSD) and scanning electron microscopy (SEM) were used to characterize the typical crack area, and the effects of grain orientation, recrystallization, low energy grain boundary, and solid solution phase on the crack propagation were analyzed. The results showed that the grains with 〈101〉 orientation can effectively hinder crack propagation compared with the grains of 〈001〉 and 〈111〉. The formation of recrystallized grains reduces the stress in the alloy, thereby reducing the crack growth rate. Low-energy grain boundaries have stronger resistance to crack propagation than random grain boundaries, and the greater the number of low-energy grain boundaries at the trifurcate grain boundary, the stronger the resistance effect. The crack propagation is promoted by the formation of a solid solution phase with brittle characteristics.

Key words: GH4151 alloy, thermal deformation, crack, extension mechanism

中图分类号:

TG306

刘建军, 魏保林, 贾智, 丁雨田. GH4151合金热变形过程中裂纹的扩展[J]. 兰州理工大学学报, 2023, 49(6): 28-32.

LIU Jian-jun, WEI Bao-lin, JIA Zhi, DING Yu-tian. Crack propagation in GH4151 alloy during hot deformation[J]. Journal of Lanzhou University of Technology, 2023, 49(6): 28-32.

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