高强钛合金层片组织拉伸变形中的裂纹萌生与扩展行为

doi:10.13251/j.issn.0254-6051.2023.10.011

金属热处理 ›› 2023, Vol. 48 ›› Issue (10): 78-86.DOI: 10.13251/j.issn.0254-6051.2023.10.011

高强钛合金层片组织拉伸变形中的裂纹萌生与扩展行为

黄晓文¹, 刘乐梁¹, 刘继雄², 王小翔², 孙巧艳¹

1.西安交通大学金属材料强度国家重点实验室, 陕西西安 710049;
2.宝鸡钛业股份有限公司, 陕西宝鸡 721014

收稿日期:2023-05-23 修回日期:2023-08-03 出版日期:2023-10-25 发布日期:2023-12-07
通讯作者: 孙巧艳,教授,E-mail:qysun@xjtu.edu.cn
作者简介:黄晓文(1998—),男,硕士研究生,主要研究方向为钛合金的组织性能,E-mail: huang_xw_sean@163.com。
基金资助:
国家自然科学基金(51671158)

Crack initiation and propagation behavior in tensile deformation of high-strength titanium alloy with lamellar microstructure

Huang Xiaowen¹, Liu Leliang¹, Liu Jixiong², Wang Xiaoxiang², Sun Qiaoyan¹

1. School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an Shaanxi 710049, China;
2. Baoji Titanium Industry Co., Ltd., Baoji Shaanxi 721014, China

Received:2023-05-23 Revised:2023-08-03 Online:2023-10-25 Published:2023-12-07

摘要/Abstract

摘要： 研究了Ti1300合金固溶时效处理后的层片组织在拉伸变形中的裂纹萌生与扩展机制,揭示了晶界魏氏体α相的形貌特点对裂纹萌生和扩展的影响规律。研究发现,合金拉伸断口为韧窝型穿晶断裂和沿晶开裂的混合形貌。随着沿晶开裂刻面数量减小,合金的断后伸长率呈增加趋势。对断口附近二次裂纹萌生的位置进行统计,发现约77%的裂纹萌生在β晶界,约23%的裂纹萌生在β晶内。提出用裂纹萌生应变参数评价裂纹萌生对应的应变量,发现晶界处萌生裂纹对应的应变量小于晶内萌生裂纹,表明裂纹在晶界萌生所需的应变量较小。对于在晶界萌生的裂纹,约88%萌生在没有魏氏体的晶界,约12%萌生在有魏氏体的晶界,表明晶界魏氏体组织能有效抑制晶界裂纹的萌生。断裂过程中高强钛合金层片组织的裂纹扩展路径为穿晶和沿晶扩展的混合形式,有魏氏体的晶界能使裂纹路径发生偏转。

关键词: 高强亚稳β钛合金, 晶界魏氏体, 裂纹萌生, 裂纹扩展

Abstract: Crack initiation and propagation mechanism in tensile deformation of Ti1300 alloy with lamellar microstructure after solution and aging treatment was investigated in detail, and the influence of grain boundary with Widmanstätten α phase (GBWα) on crack initiation and propagation was revealed. The results show that, the tensile fracture exhibits a mixed morphology of transgranular dimples and intergranular fracture facets, while the statistical analysis indicates a reduction in the number of intergranular fracture facets is related to an increase in the elongation of the alloy. By counting the locations of secondary crack initiation near the fracture, it is found that about 77% of secondary cracks near the fracture surface initiate predominantly at β grain boundaries, while about 23% of secondary cracks are initiated within β grains. By proposing a crack initiation strain parameter to assess the corresponding strain magnitudes for crack initiation, it is found that the strain parameter for cracks initiated at grain boundaries is lower than that for cracks initiated within β grains, which indicating a lower strain requirement for crack initiation at grain boundaries. As for cracks initiated at grain boundaries, 88% of them initiate at the grain boundaries without GBWα, while only 12% at those with GBWα, which indicating that the GBWα can inhibit the crack initiation. The crack propagation path in the fracture process is a mixture of extending through the grains and along the grain boundaries, and the GBWα can deflect the crack path.

Key words: high-strength metastable β titanium alloy, Widmanstätten at grain boundary, crack initiation, crack propagation

中图分类号:

TG146.2⁺3

黄晓文, 刘乐梁, 刘继雄, 王小翔, 孙巧艳. 高强钛合金层片组织拉伸变形中的裂纹萌生与扩展行为[J]. 金属热处理, 2023, 48(10): 78-86.

Huang Xiaowen, Liu Leliang, Liu Jixiong, Wang Xiaoxiang, Sun Qiaoyan. Crack initiation and propagation behavior in tensile deformation of high-strength titanium alloy with lamellar microstructure[J]. Heat Treatment of Metals, 2023, 48(10): 78-86.

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高强钛合金层片组织拉伸变形中的裂纹萌生与扩展行为

Crack initiation and propagation behavior in tensile deformation of high-strength titanium alloy with lamellar microstructure

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