摘要
对TC11钛合金进行固溶时效处理,通过光学显微镜、XRD以及冲击性能测试等,研究固溶时效处理后该合金微观组织与冲击性能的关系。结果表明:合金经955℃固溶处理后,组织由αp相与α″相构成,αp相形貌以等轴状和长条状为主,经1015℃固溶处理后,组织由α’相与α″相构成,α’相形貌呈细小针状,2组固溶条件下的合金再经时效处理后,组织中均出现βT,并析出αs相。合金的冲击韧性值在仅经955℃固溶处理后最大,其最大冲击韧性为22 J/cm^(2),经时效处理后,2组合金的冲击韧性值均随着时效温度升高而降低。当固溶温度为955℃时,断口形貌呈现韧性断裂特征,经时效处理后,断口形貌中出现二次裂纹。当固溶温度为1015℃时,断口形貌呈现脆性断裂特征,经时效处理后,断口形貌除二次裂纹外,有空洞出现。
TC11 titanium alloy was treated by solution and aging.The relationship between microstructure and impact property of the alloy after different treatments was studied by optical microscope,XRD and impact property test.The results show that after solution treatment at 955℃,the microstructure of the alloy is composed ofαp phase andα′′phase,and the morphology ofαp phase is mainly equiaxed and strip-like.After solution treatment at 1015℃,the microstructure is composed ofα′phase andα′′phase,and the morphology ofα′phase is fine needle-like.After aging treatment of the alloys under two groups of solution conditions,βT appears in the microstructure,andαs phase is precipitated.The maximum impact toughness of the alloy is 22 J/cm^(2)after solution treatment at 955℃.After aging treatment,the impact toughness of the two groups of alloys decreases with the increase in aging temperature.When the solution temperature is 955℃,the fracture morphology shows ductile fracture characteristics.After aging treatment,secondary cracks appear in the fracture morphology.When the solution temperature is 1015℃,the fracture morphology shows brittle fracture characteristics.After aging treatment,the fracture morphology exhibits holes in addition to secondary cracks.
作者
张明玉
运新兵
伏洪旺
Zhang Mingyu;Yun Xinbing;Fu Hongwang(Engineering Research Center of Continuous Extrusion,Ministry of Education,Dalian Jiaotong University,Dalian 116028,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2023年第5期1759-1766,共8页
Rare Metal Materials and Engineering
基金
国家自然科学基金(51675074)
辽宁省教育厅项目(JDL2019001)
大连市科技创新基金(2018J11CY027)。
关键词
TC11钛合金
微观组织
冲击性能
断口形貌
TC11 titanium alloy
microstructure
impact properties
fracture morphology
