The influences of adding different amount of Ti(0%,0.39%,0.87%)and three kinds of difierent aging processes(T6,T6I6,RRA)on the microstructure and properties of Al-11.3Zn-3.2Mg-1.3Cu-0.2Zr-0.1Sr were investigated.Resul...The influences of adding different amount of Ti(0%,0.39%,0.87%)and three kinds of difierent aging processes(T6,T6I6,RRA)on the microstructure and properties of Al-11.3Zn-3.2Mg-1.3Cu-0.2Zr-0.1Sr were investigated.Results show that an appropriate amount of Ti can effectively inhibit grain growth and thus achieve the efiect of grain refinement.The contribution of dislocation density and dislocation strengthening become the biggest when Ti content is 0.39%.At the same time,the intergranular corrosion depth is the lowest when Ti content is 0.39%.Among the three aging processes,the alloys reach the greatest hardness and tensile strength in T6I6.The biggest tensile strength reaches 716.77 MPa.However,when aging at RRA,the alloys obtain the greatest elongation,reaching 7.2%,as well as the good corrosion resistance.展开更多
采用包埋法在GH586表面制备了Co Cr Al Y涂层,研究了涂层在1000℃下恒温氧化和循环氧化100次后的组织和形貌。结果表明,涂层在1000℃下恒温氧化100 h和循环氧化100次后表现为良好的抗高温氧化性能,涂层表面氧化物主要以氧化铝为主。在...采用包埋法在GH586表面制备了Co Cr Al Y涂层,研究了涂层在1000℃下恒温氧化和循环氧化100次后的组织和形貌。结果表明,涂层在1000℃下恒温氧化100 h和循环氧化100次后表现为良好的抗高温氧化性能,涂层表面氧化物主要以氧化铝为主。在高温氧化过程中,扩散层的富Cr（W,Mo）相会优先通过晶界向外层扩散,这些富Cr（W,Mo）析出相有利于抑制基体合金元素向外扩散和发生反应,减小了氧化膜的生长速度,增强了涂层的抗高温氧化性能。展开更多
40Cr steel is laser quenched by the NEL-2500A rapidly axial flow CO2 laser. Then the martensite induced by laser quenched is shocked by Nd：YAG laser again. Through comparing and analyzing the appearance and size of m...40Cr steel is laser quenched by the NEL-2500A rapidly axial flow CO2 laser. Then the martensite induced by laser quenched is shocked by Nd：YAG laser again. Through comparing and analyzing the appearance and size of martensite, the dislocation density in microstmcture between the treated zones by laser quenched and by laser quenched plus laser shock, the following results are shown： The second martensite obtained by laser compound treatment is more fmer compared with those obtained by laser quenched; In the hardened zones obtained by compound treatment, a lot of slender second twin crystal martensites are induced; A lot of more high density dislocation tangles and cellular dislocations are generated. From the transmission electron microscope （TEM） micrograph after compound treatment, there are not only long lath and short nubbly martensites arranged in cross direction, but also massive nubbly and small short nubbly martensites arranged in longitudinal direction. Some martensites look like the broken blocks of quenched martensites. These new martensites are inserted transversely in the quenched martensites with large tangle. And they make quenched martensites break into pieces. Compared with the quenched martensites, the size of fresh martensites are smaller, about 0.3-0.5 μm.展开更多
基金Funded by the Key Projects of Equipment Pre-research Foundation of the Ministry of Equipment Development of the Central Military Commission of China(No.6140922010201)the Key R&D Plan of Zhenjiang in 2018(No.GY2018021)。
文摘The influences of adding different amount of Ti(0%,0.39%,0.87%)and three kinds of difierent aging processes(T6,T6I6,RRA)on the microstructure and properties of Al-11.3Zn-3.2Mg-1.3Cu-0.2Zr-0.1Sr were investigated.Results show that an appropriate amount of Ti can effectively inhibit grain growth and thus achieve the efiect of grain refinement.The contribution of dislocation density and dislocation strengthening become the biggest when Ti content is 0.39%.At the same time,the intergranular corrosion depth is the lowest when Ti content is 0.39%.Among the three aging processes,the alloys reach the greatest hardness and tensile strength in T6I6.The biggest tensile strength reaches 716.77 MPa.However,when aging at RRA,the alloys obtain the greatest elongation,reaching 7.2%,as well as the good corrosion resistance.
文摘采用包埋法在GH586表面制备了Co Cr Al Y涂层,研究了涂层在1000℃下恒温氧化和循环氧化100次后的组织和形貌。结果表明,涂层在1000℃下恒温氧化100 h和循环氧化100次后表现为良好的抗高温氧化性能,涂层表面氧化物主要以氧化铝为主。在高温氧化过程中,扩散层的富Cr（W,Mo）相会优先通过晶界向外层扩散,这些富Cr（W,Mo）析出相有利于抑制基体合金元素向外扩散和发生反应,减小了氧化膜的生长速度,增强了涂层的抗高温氧化性能。
基金This project is supported by National Natural Science Foundation of China (No. 50451004)Talent Foundation of Jiangsu University, China.
文摘40Cr steel is laser quenched by the NEL-2500A rapidly axial flow CO2 laser. Then the martensite induced by laser quenched is shocked by Nd：YAG laser again. Through comparing and analyzing the appearance and size of martensite, the dislocation density in microstmcture between the treated zones by laser quenched and by laser quenched plus laser shock, the following results are shown： The second martensite obtained by laser compound treatment is more fmer compared with those obtained by laser quenched; In the hardened zones obtained by compound treatment, a lot of slender second twin crystal martensites are induced; A lot of more high density dislocation tangles and cellular dislocations are generated. From the transmission electron microscope （TEM） micrograph after compound treatment, there are not only long lath and short nubbly martensites arranged in cross direction, but also massive nubbly and small short nubbly martensites arranged in longitudinal direction. Some martensites look like the broken blocks of quenched martensites. These new martensites are inserted transversely in the quenched martensites with large tangle. And they make quenched martensites break into pieces. Compared with the quenched martensites, the size of fresh martensites are smaller, about 0.3-0.5 μm.
