南京工业大学学报（自然科学版）2025，Vol.47Issue(3)：244-250,278,8.DOI:10.3969/j.issn.1671-7627.2025.03.003
晶粒尺寸对GH4169合金室温和高温力学性能的影响
Effects of grain size on mechanical properties of GH4169 alloy at room temperature and high temperature
摘要
Abstract
The effect of grain size on the mechanical properties of GH4169 alloy was investigated through tensile tests at both room temperature and high temperature.The results showed that both strength and ductility of GH4169 alloy decreased with increasing grain size at room temperature and high temperature.At room temperature,the grain boundary strength of GH4169 alloy exceeded its intragranular strength,indicating significant grain boundary strengthening.The fracture mode was characterized by transgranular ductile fracture,with yield strength,tensile strength,and elongation all following the Hall-Petch relationship.At high temperature,as the grain size increased,the fracture surfaces exhibited distinct intergranular characteristics,and the fracture mode transitioned from transgranular ductile fracture to intergranular brittle fracture.In this case,the mechanical properties did not conform to the Hall-Petch relationship.关键词
GH4169合金/晶粒尺寸/力学性能/Hall-Petch关系/韧性断裂/脆性断裂Key words
GH4169 alloy/grain size/mechanical properties/Hall-Petch relationship/ductile fracture/brittle fracture分类
金属材料引用本文复制引用
吴志伟,姜勇,巩建鸣..晶粒尺寸对GH4169合金室温和高温力学性能的影响[J].南京工业大学学报（自然科学版）,2025,47(3):244-250,278,8.基金项目
国家重点研发计划(2022YFF0605600) （2022YFF0605600）
