摘要
采用光学金相显微镜(OM)和扫描电子显微镜(SEM)等手段研究了一种含稀土元素Nd的Ti60钛合金在电子束焊接过程中富Nd第二相颗粒的演化及室温拉伸时的断裂特征。经过电子束焊接过程的快速熔化和凝固,Ti60钛合金中富Nd第二相颗粒经历了回溶和重新形核析出的过程,由原来的分散分布变为与凝固方向平行的断续串状分布,尺寸由原来的约10μm细化至约0.3μm。电子束焊接的焊缝及焊缝与母材的连接部位在室温拉伸时表现出了明显的沿晶脆性断裂特征。
Evolution of Nd-rich second phase particles during electron beam welding of Ti60 titanium alloy containing rare earth Nd and its effect on room temperature tensile fracture behavior have been studied using optical microscopy （OM） and scanning electron microscopy （ SEM）. After rapid melting and solidification of the welding joint during the electron beam welding procedure, the dispersed distributed Nd-rich second phase particles with about 10μm in Ti60 titanium alloy disc forging dissolved, nucleated and re-precipitated, the new formed Nd-rich second phase particles were refined to about 0.3 μm, and were intermittently layer distributed parallel to the solidification direction. The welding joint and the interface between welding joint and heat affected zone show evident characteristic of intergranular brittle rupture.
出处
《航空材料学报》
EI
CAS
CSCD
北大核心
2009年第1期27-31,共5页
Journal of Aeronautical Materials
关键词
富Nd第二相颗粒
电子束焊接
沿晶脆性断裂
Nd-rieh second phase particle
electron beam welding
intergranular brittle rupture
