钛合金双片层组织对性能的影响

详细信息

Effects of Bi-lamellar Microstructure on the Properties of Titanium Alloy

摘要: 研究了通过热处理制度调整,在合金α片层之间形成细小的条状次生α相,形成一种新型的钛合金显微组织——双片层组织。通过对比等轴组织、双态组织、片层组织和双片层组织的性能,结果表明,在合金的强度和塑性不损失的条件下,双片层组织进一步提高了裂纹在合金中的扩展阻抗,使得合金的断裂韧性得到改善,疲劳裂纹扩展速率得到降低。双片层组织提高了疲劳裂纹扩展路径,使得大量的次生裂纹萌生。
- 显微组织 /
- 损伤容限 /
- 疲劳裂纹扩展速率 /
- 断裂韧性
Abstract: A new type of microstructure,named bi-lamellar microstructure of titanium alloy comes out of precipitated small secondary α needles in the β matrix through modification heat treatment.A comparison of microstructure and property of titanium alloy between equaixed,bi-model and lamellar microstructure is made.The results manifest that bi-lamellar microstructure improves the fracture toughness and fatigue crack propagation behavior of TA15 alloys remarkably,increases the length of fatigue crack propagation and brings about large secondary cracks.
- Microstructure /
- Damage tolerance /
- Fatigue crack propagation rate /
- Fracture toughness