Anti-hydrogen Embrittlement Performance and Micro-strengthen
发布时间：2021-03-03 03:10
激光喷丸是一种新兴的表面强化工艺,其主要通过在金属材料表面诱导形成高幅值的残余压应力以及有益的微观组织来提高材料的表面性能。TC4钛合金在富氢环境中具有氢脆倾向,在高压环境下的氢致裂纹会导致服役件的提前失效。采用激光喷丸技术提高TC4钛合金抗氢脆性能的研究目前尚处于起步阶段。本文通过理论分析和试验研究,开展激光喷丸TC4钛合金的抗氢脆性能研究,考察了不同充氢条件下,激光喷丸试样宏微观力学响应,并分析了激光喷丸强化TC4钛合金的抗氢脆微观机理。本文的主要研究工作如下:（1）从理论上初步探讨了金属材料的氢脆机理,特别地,分析了氢在金属中的侵入和扩散过程,以及氢含量对材料微观结构和力学性能的影响。阐述了激光喷丸诱导的组织强化和应力强化对合金抗氢脆性能的影响,为试验研究奠定了理论基础。（2）开展了不同激光功率下的TC4钛合金激光喷丸试验,并对喷丸和未喷丸试样分别进行24 h和48 h电化学充氢处理。随后对处理试样的残余应力、表面形貌及典型区域的化学成分进行了测试,并采用OM和TEM对激光喷丸样充氢前后的表层微观组织进行了观测。结果表明,激光喷丸可诱导合金表层形成高达-517MPa的残余压应力,...
【文章来源】：江苏大学江苏省
【文章页数】：109 页
【学位级别】：硕士
【文章目录】：
ABSTRACT
摘要
DEDICATION
CHAPTER ONE:INTRODUCTION
1.1 Introduction
1.2 Overview of Titanium alloys and its various applications
1.2.1 General features and characteristics of titanium alloys
1.2.2 The various applications and importance of titanium alloys
1.2.3 Challenges faced by titanium alloys when operating in hydrogenated environments
1.3 Hydrogen containing service life environment and its associated challenges
1.3.1 The key role of Hydrogen as a source of industrial energy
1.3.2 Hydrogen embrittlement of metals
1.3.3 Metallurgical reasons behind the degradation of titanium alloys under hydrogenated service life conditions
1.4 Overview of studies on hydrogen embrittlement of titanium alloys and the traditional strategies deployed to tackle this phenomenon
1.4.1 Research progress on hydrogen embrittlement of titanium alloys
1.4.2 Research progress on technological solutions to hydrogen embrittlement of titanium alloy and its associated problems
1.5 The prospect of Laser peening treatment in improving the hydrogen embrittlement resistance of TC
1.5.1 Overview of Laser peening technology
1.5.2 Advantages of laser peening technique in surface processing
1.5.3 Research progress on laser peening treatment of metals
1.5.4 Research progress regarding laser peening treatment on hydrogen embrittlement resistance in metals
1.6 Purpose and relevance of the research topic and the main contents
1.6.1 Significance of the study
1.6.2 Main contents and the methodology used in this study
CHAPTER2:THEORY BEHIND HYDROGEN EMBRITTLEMENT RESISTANCE OF LASER PEENED TC4 TITANIUM ALLOY
2.1 Mechanism of Hydrogen Embrittlement in alloys
2.1.1 Causative mechanism of hydrogen embrittlement in alloys
2.1.2 Hydrogen diffusion and transportation mechanism in alloys
2.1.3 State of hydrogen in the alloy
2.2 Effect of hydrogen contents on titanium alloys
2.2.1 Effect of hydrogen contents on microstructure
2.2.2 Effect of hydrogen contents on mechanical properties
2.3 Enhanced hydrogen embrittlement resistance through laser peening
2.3.1 Role of laser peening induced compressive residual stress on hydrogen embrittlement resistance
2.3.2 Microstructural strengthening effects of laser peening on hydrogen embrittlement resistance
2.3.3 Effect of laser peening on mechanical properties
2.4 Summary
CHAPTER3:EXPERIMENTAL STUDY ON THE SURFACE PERFORMANCE OF LASER PEENED TC4 SUBJECTED TO DIFFERENT HYDROGENATION CONDITIONS
3.1 Laser peening experimental conditions and equipment
3.1.1 Test equipment and related technical parameters
3.1.2 Material composition and sample preparation
3.1.3 Experimental program
3.2 Electrochemical hydrogenation test
3.2.1 Test equipment and sample preparation
3.2.2 Test process
3.3 Surface performance test
3.3.1 Residual stress test
3.3.2 Surface microstructure observations
3.3.3 XRD phase detection
3.4 Test results and analysis
3.4.1 Surface residual stress analysis
3.4.2 Microstructure analysis
3.4.3 XRD analysis
3.5 Summary
CHAPTER4:STUDY ON THE IMPACT OF LASER PEENING ON THE MECHANICAL PROPERTIES OF DIFFERENTLY HYDROGENATED TC
4.1 Experimental equipment and test methods
4.1.1 Microhardness test plan and equipment
4.1.2 Tensile test plan and equipment
4.2 Results and analysis
4.2.1 Microhardness analysis
4.2.2 Tensile properties analysis
4.2.3 Fracture morphology analysis
4.3 Laser peening effects on the anti-hydrogen embrittlement mechanism of TC4 under differently hydrogenated conditions
4.4 Summary
CHAPTER5:CONCLUSIONS AND RECOMMENDATIONS FOR PROSPECTIVE RESEARCH DIRECTION
5.1 Conclusions
5.2 Recommendations for prospective research direction
REFERENCES
ACKNOWLEDGEMENTS
PUBLICATIONS DURING MASTERS STUDIES
【参考文献】：
期刊论文
[1]激光熔覆技术在飞机修理中的应用[J]. 曹强,程宗辉,张志强. 长沙航空职业技术学院学报. 2015(01)
[2]金属材料表面自纳米化研究进展[J]. 吴建军,李阳,孙德明. 热处理技术与装备. 2013(01)
[3]钒在高锰钢中扩散的试验研究[J]. 余世浩,冯伟标,曾辉. 武汉理工大学学报. 2012(08)
[4]氢对钛合金的影响[J]. 杨彦涛,王禹华,张永洋. 材料开发与应用. 2009(01)
[5]钛-氢体系的物理化学性质[J]. 黄刚,曹小华,龙兴贵. 材料导报. 2006(10)
本文编号：3060478
【文章来源】：江苏大学江苏省
【文章页数】：109 页
【学位级别】：硕士
【文章目录】：
ABSTRACT
摘要
DEDICATION
CHAPTER ONE:INTRODUCTION
1.1 Introduction
1.2 Overview of Titanium alloys and its various applications
1.2.1 General features and characteristics of titanium alloys
1.2.2 The various applications and importance of titanium alloys
1.2.3 Challenges faced by titanium alloys when operating in hydrogenated environments
1.3 Hydrogen containing service life environment and its associated challenges
1.3.1 The key role of Hydrogen as a source of industrial energy
1.3.2 Hydrogen embrittlement of metals
1.3.3 Metallurgical reasons behind the degradation of titanium alloys under hydrogenated service life conditions
1.4 Overview of studies on hydrogen embrittlement of titanium alloys and the traditional strategies deployed to tackle this phenomenon
1.4.1 Research progress on hydrogen embrittlement of titanium alloys
1.4.2 Research progress on technological solutions to hydrogen embrittlement of titanium alloy and its associated problems
1.5 The prospect of Laser peening treatment in improving the hydrogen embrittlement resistance of TC
1.5.1 Overview of Laser peening technology
1.5.2 Advantages of laser peening technique in surface processing
1.5.3 Research progress on laser peening treatment of metals
1.5.4 Research progress regarding laser peening treatment on hydrogen embrittlement resistance in metals
1.6 Purpose and relevance of the research topic and the main contents
1.6.1 Significance of the study
1.6.2 Main contents and the methodology used in this study
CHAPTER2:THEORY BEHIND HYDROGEN EMBRITTLEMENT RESISTANCE OF LASER PEENED TC4 TITANIUM ALLOY
2.1 Mechanism of Hydrogen Embrittlement in alloys
2.1.1 Causative mechanism of hydrogen embrittlement in alloys
2.1.2 Hydrogen diffusion and transportation mechanism in alloys
2.1.3 State of hydrogen in the alloy
2.2 Effect of hydrogen contents on titanium alloys
2.2.1 Effect of hydrogen contents on microstructure
2.2.2 Effect of hydrogen contents on mechanical properties
2.3 Enhanced hydrogen embrittlement resistance through laser peening
2.3.1 Role of laser peening induced compressive residual stress on hydrogen embrittlement resistance
2.3.2 Microstructural strengthening effects of laser peening on hydrogen embrittlement resistance
2.3.3 Effect of laser peening on mechanical properties
2.4 Summary
CHAPTER3:EXPERIMENTAL STUDY ON THE SURFACE PERFORMANCE OF LASER PEENED TC4 SUBJECTED TO DIFFERENT HYDROGENATION CONDITIONS
3.1 Laser peening experimental conditions and equipment
3.1.1 Test equipment and related technical parameters
3.1.2 Material composition and sample preparation
3.1.3 Experimental program
3.2 Electrochemical hydrogenation test
3.2.1 Test equipment and sample preparation
3.2.2 Test process
3.3 Surface performance test
3.3.1 Residual stress test
3.3.2 Surface microstructure observations
3.3.3 XRD phase detection
3.4 Test results and analysis
3.4.1 Surface residual stress analysis
3.4.2 Microstructure analysis
3.4.3 XRD analysis
3.5 Summary
CHAPTER4:STUDY ON THE IMPACT OF LASER PEENING ON THE MECHANICAL PROPERTIES OF DIFFERENTLY HYDROGENATED TC
4.1 Experimental equipment and test methods
4.1.1 Microhardness test plan and equipment
4.1.2 Tensile test plan and equipment
4.2 Results and analysis
4.2.1 Microhardness analysis
4.2.2 Tensile properties analysis
4.2.3 Fracture morphology analysis
4.3 Laser peening effects on the anti-hydrogen embrittlement mechanism of TC4 under differently hydrogenated conditions
4.4 Summary
CHAPTER5:CONCLUSIONS AND RECOMMENDATIONS FOR PROSPECTIVE RESEARCH DIRECTION
5.1 Conclusions
5.2 Recommendations for prospective research direction
REFERENCES
ACKNOWLEDGEMENTS
PUBLICATIONS DURING MASTERS STUDIES
【参考文献】：
期刊论文
[1]激光熔覆技术在飞机修理中的应用[J]. 曹强,程宗辉,张志强. 长沙航空职业技术学院学报. 2015(01)
[2]金属材料表面自纳米化研究进展[J]. 吴建军,李阳,孙德明. 热处理技术与装备. 2013(01)
[3]钒在高锰钢中扩散的试验研究[J]. 余世浩,冯伟标,曾辉. 武汉理工大学学报. 2012(08)
[4]氢对钛合金的影响[J]. 杨彦涛,王禹华,张永洋. 材料开发与应用. 2009(01)
[5]钛-氢体系的物理化学性质[J]. 黄刚,曹小华,龙兴贵. 材料导报. 2006(10)
本文编号：3060478
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