激光噴丸是一種新興的表面強(qiáng)化工藝,其主要通過(guò)在金屬材料表面誘導(dǎo)形成高幅值的殘余壓應(yīng)力以及有益的微觀組織來(lái)提高材料的表面性能。TC4鈦合金在富氫環(huán)境中具有氫脆傾向,在高壓環(huán)境下的氫致裂紋會(huì)導(dǎo)致服役件的提前失效。采用激光噴丸技術(shù)提高TC4鈦合金抗氫脆性能的研究目前尚處于起步階段。本文通過(guò)理論分析和試驗(yàn)研究,開(kāi)展激光噴丸TC4鈦合金的抗氫脆性能研究,考察了不同充氫條件下,激光噴丸試樣宏微觀力學(xué)響應(yīng),并分析了激光噴丸強(qiáng)化TC4鈦合金的抗氫脆微觀機(jī)理。本文的主要研究工作如下:（1）從理論上初步探討了金屬材料的氫脆機(jī)理,特別地,分析了氫在金屬中的侵入和擴(kuò)散過(guò)程,以及氫含量對(duì)材料微觀結(jié)構(gòu)和力學(xué)性能的影響。闡述了激光噴丸誘導(dǎo)的組織強(qiáng)化和應(yīng)力強(qiáng)化對(duì)合金抗氫脆性能的影響,為試驗(yàn)研究奠定了理論基礎(chǔ)。（2）開(kāi)展了不同激光功率下的TC4鈦合金激光噴丸試驗(yàn),并對(duì)噴丸和未噴丸試樣分別進(jìn)行24 h和48 h電化學(xué)充氫處理。隨后對(duì)處理試樣的殘余應(yīng)力、表面形貌及典型區(qū)域的化學(xué)成分進(jìn)行了測(cè)試,并采用OM和TEM對(duì)激光噴丸樣充氫前后的表層微觀組織進(jìn)行了觀測(cè)。結(jié)果表明,激光噴丸可誘導(dǎo)合金表層形成高達(dá)-517MPa的殘余壓應(yīng)力,... 

【文章來(lái)源】：江蘇大學(xué)江蘇省

【文章頁(yè)數(shù)】：109 頁(yè)

【學(xué)位級(jí)別】：碩士

【文章目錄】：
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


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