Research on Effects of Uneven Macrostructure to Mechanical Properties in TC21 Forging

摘要：

　　The microstructure,tensile properties,fracture toughness,fatigue crack growth rate and fatigue limit of different macrostructure regions in TC21 open-die forging were investigated.The results show that the microstructure is also uneven corresponding to non-uniform macrostructure.The ultimate tensile strength (UTS) and yield strength (YS) of coarse-grained zone are that UTS≥1070MPa,YS≥960MPa,which can meet the requirement of technical standard,whereas the strength of fine-grained zone drops more than 100MPa.The fracture toughness of this forging is that KIC≥90MPa·m1/2,being equivalent to the normal one.But when △K=11MPa·m1/2,the fatigue crack growth rate is that da/dN=2.488758×10-5mm/cycle,higher than the normal TC21 open-die forging for an order of magnitude.The fatigue limit of fine-grained zone drops about 40MPa compared with coarse-grained zone.Uneven macrostructure and microstructure lead to a decline of tensile and fatigue property in TC21 forging.

关键词： TC21 alloy Open-die forging Uneven macrostructure Mechanical properties

作者: Jun Li Zhishou Zhu Xinnan Wang Yue Fei Guoqiang Shang Liwei Zhu

作者单位: Beijing Institute of Aeronautical Materials, Beijing 100095, China

会议类型: 国际会议

会议名称: the Chinese Materials Congress 2012(2012年中国材料大会(CMC2012))

会议地点: 太原

会议语种:英文

页码: 823-827

在线出版日期: 2012-07-13（万方平台首次上网日期，不代表论文的发表时间）