激光喷丸改善高温合金抗热腐蚀性能试验研究.doc
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激光喷丸改善高温合金抗热腐蚀性能试验研究,18000字37页 摘要高温合金具有优异的的耐高温和耐腐蚀等性能，已越来越多地应用在国防和航空领域。随着航空和军工事业的发展，对发动机涡轮叶片材料性能的要求越来越高，激光喷丸强化作为革新的表面改性技术，为提高材料的强度、耐磨性、耐腐蚀性等提供了一种行之有效的手段。本文以in718...
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激光喷丸改善高温合金抗热腐蚀性能试验研究
18000字 37页
摘要
高温合金具有优异的的耐高温和耐腐蚀等性能，已越来越多地应用在国防和航空领域。随着航空和军工事业的发展，对发动机涡轮叶片材料性能的要求越来越高，激光喷丸强化作为革新的表面改性技术，为提高材料的强度、耐磨性、耐腐蚀性等提供了一种行之有效的手段。本文以IN718镍基合金为对象，开展激光喷丸强化的机理及试验研究，并进行相关性能的测试和表征，探讨喷丸强化表面的热腐蚀行为。主要工作有以下几点：
介绍了激光喷丸技术的原理和特点，讲述激光喷丸技术在国内外的发展现状；测量了激光喷丸强化对材料的表面质量、微观组织的影响，并分析其机理；基于热腐蚀的基本理论，研究了激光喷丸改善材料热腐蚀行为的机理。
开展了IN718 镍基合金在常温下不同能量的激光喷丸试验，采用加热电阻炉对喷丸强化试样进行相同时间700℃、800℃和900℃温度下的热腐蚀试验，并对未喷丸试样进行相同条件下的热腐蚀试验，对两者试验前后的质量进行测量，算出试样的失重和腐蚀失重率，数据显示未喷丸试样的腐蚀失重率是喷丸试样的9倍左右，比较表明激光喷丸强化使高温合金的抗热腐蚀性能提高。
对腐蚀后的试样进行微观组织观察，分析喷丸和未喷丸试样腐蚀后金相组织发现，未喷丸和喷丸试样都存在腐蚀层，但未喷丸试样的腐蚀层更明显且组织更蓬松。
关键词：激光喷丸；高温合金；表面性能；热腐蚀
ABSTRACT
With the excellent high temperature performance and corrosion-resistant properties,Superalloy have been increasingly used in defense and aerospace fields.With the development of aviation and military career, the material properties of the engine turbine blades have become increasingly demanding.As a innovative surface modification technology,Laser peening (LP) provide a an effective measure for the material to improve the strength, wear resistance, corrosion resistance.In this dissertation,In 718 Ni-based alloy was treated by LP and the performance of samples after LP were analyzed and characterized.Based on theoretical analysis and experimental study,the effect of LP on improving high-temperature stability and hot-corrosion resistance were studied. The principal works in this paper are as following:
Principles and characteristics of laser peening technology was introduced here.The development status at home and abroad of LP was also introduced.The effect of LP on the surface quality and microstructure of materials was measured,and analyze its mechanism.Based on the basic theory of hot corrosion, the mechanism of how LP improve the hot corrosion behavior of material.
A set of LP experiments under different power on In 718 alloy were conducted at room temperature.Resistance heating furnace used to take the hot corrosion test of the specimen under LP for the same time at different temperatures such as 700℃、800℃ and 900℃,as well as the specimen without LP.Measuring the quality of the specimen before and after the test is both needed.Then calculate the eroded quality and the corrosion weight loss rate.The corrosion weight loss rate of the the specimen without LP is much higher than the corrosion weight loss rate of the specimen under LP. So the comparison shows that the laser peening can improve the hot corrosion resistance of superalloy.
Microstructure observation were taken after the corrosion to analyze the different organizations between the specimen under LP and the specimen without LP.The corrosion layer exists both in the surface of the two kinds of the specimens,but the the corrosion layer of the specimen without LP is much more serious and the organization is much more fleeciness.
Key words:LP;superalloy;surface integrity;hot-corrosion
目录
第一章 绪论 1
1.1 引言 1
1.2 高温合金表面改性的研究现状 3
1.3 激光喷丸强化技术 6
1.3.1激光喷丸强化技术 6
1.3.2激光喷丸强化技术的应用 8
1.3.3激光喷丸强化技术存在的问题 9
1.4 热腐蚀 9
1.4.1 热腐蚀的理论 9
1.4.2 影响热腐蚀的主要因素 10
1.4.3 热腐蚀的研究 11
1.5 课题研究的意义和主要内容 12
1.5.1 研究意义 12
1.5.2课题的主要研究内容 12
1.5.3研究方法、设计方案 12
第二章 激光喷丸强化IN718镍基高温合金及其热腐蚀试验研究 14
2.1 激光喷丸试验 14
2.1.1 试样的制备 14
2.1.2试样仪器及装备 15
2.1.3激光温喷丸实验参数设置 16
2.1.4试验后处理 17
2.2热腐蚀试验 18
2.2.1试样制备 18
2.2.2试验方法和仪器 19
2.2.3在硫酸盐中的热腐蚀行为 21
2.2.4热腐蚀后的微观组织观察 23
第三章 总结与展望 26
3.1总结 26
3.2展望 26
致谢 27
参考文献 28
18000字 37页
摘要
高温合金具有优异的的耐高温和耐腐蚀等性能，已越来越多地应用在国防和航空领域。随着航空和军工事业的发展，对发动机涡轮叶片材料性能的要求越来越高，激光喷丸强化作为革新的表面改性技术，为提高材料的强度、耐磨性、耐腐蚀性等提供了一种行之有效的手段。本文以IN718镍基合金为对象，开展激光喷丸强化的机理及试验研究，并进行相关性能的测试和表征，探讨喷丸强化表面的热腐蚀行为。主要工作有以下几点：
介绍了激光喷丸技术的原理和特点，讲述激光喷丸技术在国内外的发展现状；测量了激光喷丸强化对材料的表面质量、微观组织的影响，并分析其机理；基于热腐蚀的基本理论，研究了激光喷丸改善材料热腐蚀行为的机理。
开展了IN718 镍基合金在常温下不同能量的激光喷丸试验，采用加热电阻炉对喷丸强化试样进行相同时间700℃、800℃和900℃温度下的热腐蚀试验，并对未喷丸试样进行相同条件下的热腐蚀试验，对两者试验前后的质量进行测量，算出试样的失重和腐蚀失重率，数据显示未喷丸试样的腐蚀失重率是喷丸试样的9倍左右，比较表明激光喷丸强化使高温合金的抗热腐蚀性能提高。
对腐蚀后的试样进行微观组织观察，分析喷丸和未喷丸试样腐蚀后金相组织发现，未喷丸和喷丸试样都存在腐蚀层，但未喷丸试样的腐蚀层更明显且组织更蓬松。
关键词：激光喷丸；高温合金；表面性能；热腐蚀
ABSTRACT
With the excellent high temperature performance and corrosion-resistant properties,Superalloy have been increasingly used in defense and aerospace fields.With the development of aviation and military career, the material properties of the engine turbine blades have become increasingly demanding.As a innovative surface modification technology,Laser peening (LP) provide a an effective measure for the material to improve the strength, wear resistance, corrosion resistance.In this dissertation,In 718 Ni-based alloy was treated by LP and the performance of samples after LP were analyzed and characterized.Based on theoretical analysis and experimental study,the effect of LP on improving high-temperature stability and hot-corrosion resistance were studied. The principal works in this paper are as following:
Principles and characteristics of laser peening technology was introduced here.The development status at home and abroad of LP was also introduced.The effect of LP on the surface quality and microstructure of materials was measured,and analyze its mechanism.Based on the basic theory of hot corrosion, the mechanism of how LP improve the hot corrosion behavior of material.
A set of LP experiments under different power on In 718 alloy were conducted at room temperature.Resistance heating furnace used to take the hot corrosion test of the specimen under LP for the same time at different temperatures such as 700℃、800℃ and 900℃,as well as the specimen without LP.Measuring the quality of the specimen before and after the test is both needed.Then calculate the eroded quality and the corrosion weight loss rate.The corrosion weight loss rate of the the specimen without LP is much higher than the corrosion weight loss rate of the specimen under LP. So the comparison shows that the laser peening can improve the hot corrosion resistance of superalloy.
Microstructure observation were taken after the corrosion to analyze the different organizations between the specimen under LP and the specimen without LP.The corrosion layer exists both in the surface of the two kinds of the specimens,but the the corrosion layer of the specimen without LP is much more serious and the organization is much more fleeciness.
Key words:LP;superalloy;surface integrity;hot-corrosion
目录
第一章 绪论 1
1.1 引言 1
1.2 高温合金表面改性的研究现状 3
1.3 激光喷丸强化技术 6
1.3.1激光喷丸强化技术 6
1.3.2激光喷丸强化技术的应用 8
1.3.3激光喷丸强化技术存在的问题 9
1.4 热腐蚀 9
1.4.1 热腐蚀的理论 9
1.4.2 影响热腐蚀的主要因素 10
1.4.3 热腐蚀的研究 11
1.5 课题研究的意义和主要内容 12
1.5.1 研究意义 12
1.5.2课题的主要研究内容 12
1.5.3研究方法、设计方案 12
第二章 激光喷丸强化IN718镍基高温合金及其热腐蚀试验研究 14
2.1 激光喷丸试验 14
2.1.1 试样的制备 14
2.1.2试样仪器及装备 15
2.1.3激光温喷丸实验参数设置 16
2.1.4试验后处理 17
2.2热腐蚀试验 18
2.2.1试样制备 18
2.2.2试验方法和仪器 19
2.2.3在硫酸盐中的热腐蚀行为 21
2.2.4热腐蚀后的微观组织观察 23
第三章 总结与展望 26
3.1总结 26
3.2展望 26
致谢 27
参考文献 28
