论文总字数：18940字

摘 要

钛及钛合金具有许多的优异特性，比如密度小、比强度高、耐腐蚀性能好、无磁性、耐高温及低温、抗疲劳以及蠕变性好和生物相容性好等特点，因此钛合金已经在海洋工程、石油化工、国防军工、医疗及建筑装饰等各领域广泛应用。但由于钛合金成本较昂贵因此未大规模使用，所以，新型低成本钛合金的开发成为当下研究的热点。本课题组采用自行设计低成本Ti-Al-Fe-B合金，该合金相比于Ti-6Al-4V合金生产成本相对较低。本文基于新型Ti-Fe-B合金，采取多种方法研究不同应变速率对其应力腐蚀敏感性的影响，包括XRD测试，金相观察，不同应变速率下低成本钛合金的慢应变拉伸试验，断口形貌观察等，总结并分析应变速率对拉伸性能以及应力腐蚀敏感性的影响。

关键词：低成本 钛合金 腐蚀 应力腐蚀

Research on Stress Corrosion Performance of Ti-Fe-B Alloy in Simulated Seawater

Abstract

Titanium and titanium alloys have many excellent characteristics, such as low density, high specific strength, corrosion resistance, non-magnetic, high/low temperature resistance, good fatigue, creep resistance and biocompatibility. Therefore, titanium alloy has been widely used in various fields such as defense military industry, marine engineering, petrochemical industry, medical treatment and architectural decoration. However, because of the high price of titanium alloys, it cannot be used on a large scale. Therefore, the development of new low-cost titanium alloys has become a hot spot of current research. Compared with Ti-6Al-4V alloy, the low-cost Ti-Al-Fe-B alloy designed by our research group has a relatively low production cost. Based on the new Ti-Fe-B alloy, this paper adopts a variety of methods to study the effect of different strain rates on its stress corrosion sensitivity, including XRD test, metallographic observation, low strain titanium alloy slow strain tensile test at different strain rates and observation of fracture morphology, etc. Summarize and analyze the effect of strain rate on tensile properties and stress corrosion sensitivity.

Key Words: Low cost; Titanium alloy; Corrosion; Stress corrosion

目 录

摘要…………………………………………………………………………………I

ABSTRACT………………………………………………………………………II

第一章 绪论………………………………………………………………………1

1.1 钛合金的背景………………………………………………………………1

1.1.1 研究背景……………………………………………………………1

1.1.2 分类…………………………………………………………………1

1.2 低成本钛合金的研究现状…………………………………………………5

1.2.1腐蚀…………………………………………………………………5

1.2.2应力腐蚀……………………………………………………………6

1.3 研究内容与预期目标………………………………………………………8

1.3.1研究内容……………………………………………………………8

1.3.2预期目标……………………………………………………………9

第二章 实验方案设计…………………………………………………………10

2.1 实验材料制备………………………………………………………………10

2.1.1 实验原材料…………………………………………………………10

2.1.2 仪器设备……………………………………………………………10

2.2 微观组织分析………………………………………………………………11

2.2.1 金相制备与显微组织观察…………………………………………11

2.2.2 XRD物相分析………………………………………………………11

2.3腐蚀性能测试………………………………………………………………11

2.3.1 电化学实验…………………………………………………………11

2.3.2 慢应变速率拉伸实验………………………………………………12

2.3.3 断口形貌分析………………………………………………………14

第三章 实验结果………………………………………………………………15

3.1 Ti-Fe-B组织观察…………………………………………………………15

3.2 慢应变速率拉伸试验………………………………………………………15

3.3 电化学实验…………………………………………………………………17

3.3.1 开路电位曲线测试…………………………………………………17

3.3.2 动电位极化曲线测试………………………………………………18

3.3.3交流阻抗普测试……………………………………………………19

3.3.4 应力腐蚀开裂机理讨论……………………………………………19

第四章 结论………………………………………………………………………21

参考文献……………………………………………………………………………22

致谢…………………………………………………………………………………24

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