表面技术2016，Vol.45Issue(4)：110-115,6.DOI:10.16490/j.cnki.issn.1001-3660.2016.04.019
表面再结晶晶粒对涡轮叶片DZ4合金疲劳性能的影响
Effect of Surface Recrystallized Grains on the Fatigue Performance of Turbine Blade DZ4 Alloy
摘要
Abstract
Objective To understand the effect of recrystallization ( RX) on the fatigue failure mechanism of turbine blade DZ4 al-loy, so as to develop a method to improve the fatigue life. Methods The domestic turbine blade DZ4 alloy was used. DZ4 was shot peened under different pressures (0.1, 0.3, 0.5 MPa), and heat treated at 1220℃ to generate surface recrystallization. The micro-structure of surface recrystallization was characterized by scanning electronic microscope (SEM). Fatigue testing was conducted on the raw DZ4 and surface recrystallized DZ4 alloy. Results Under lower pressure (e. g. 0.1 MPa), recrystallization occurred in form of discrete recrystallized grains, which remarkably reduced the fatigue life of DZ4. Under higher peening pressures (0.3 MPa and 0. 5 MPa) , fully recrystallized grains were observed and the recrystallized thickness increased with peening pressure. The fatigue life of RX-0. 5 MPa sample could be longer than that of raw DZ4 alloy. Conclusion Recrystallization did not necessarily reduce the fatigue life of DZ4 alloy. Under lower shot peening pressure (e. g. 0.1 MPa) and heat treatment, the discrete RX was the most detrimental to fatigue life. Under higher shot peening pressure (e. g. 0.5 MPa), the compact recrystallized layer with fine grain size was beneficial to the fatigue life of DZ4. Crystal plasticity model was helpful in understanding and predicting the influence of RX on fatigue property.关键词
定向凝固合金/再结晶/表面处理/涡轮叶片/疲劳寿命/晶粒尺寸/晶体塑性Key words
directionally solidified alloy/recrystallization/surface treatment/turbine blade/fatigue life/grain size/crystal plasticity分类
矿业与冶金引用本文复制引用
马显锋,施惠基..表面再结晶晶粒对涡轮叶片DZ4合金疲劳性能的影响[J].表面技术,2016,45(4):110-115,6.基金项目
中山大学"百人计划"科研资助项目 Supported by the "One Hundred Talents" Research Funding Program of Sun Yat-Sen University （）
