激光立体成形Ti-25V-15Cr合金的阻燃性能
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摘要
研究了激光立体成形(laser solid forming,LSF)Ti-25V-15Cr合金的阻燃性能。采用直流电弧激发燃烧法(direct current simulation burning,DCSB)测试其阻燃性能并与锻造Ti40合金进行比较。基于二者原始组织、燃烧产物的观察与分析揭示其阻燃机理。结果表明,激光立体成形Ti-25V-15Cr合金的燃烧速率略低于锻造Ti40合金。燃烧后各区域组织分析表明,激光立体成形Ti-25V-15Cr合金和锻造Ti40合金燃烧产物区均由Ti的氧化物、V的氧化物以及基体组成,Ti-25V-15Cr合金燃烧产物区氧化物面积略小于锻造Ti40合金,同时燃烧热影响区的晶界和亚晶界处发现明显的V、Cr元素的偏聚。激光立体成形Ti-25V-15Cr合金中局部枝晶组织以及亚晶粒的形成增加了微观结构的缺陷,在受热条件下使得V、Cr元素的扩散能力增强,是其抗燃烧性能略优于锻造Ti40合金的原因。
The burn-resistant property of laser solid forming(LSF) Ti-25V-15Cr alloy was studied, and compared with that of forging Ti40 alloy. The burn-resistant mechanism was disclosed by combining the analysis of the microstructure of the alloy and the combustion products. The results show that the burning rate of Ti-25V-15Cr alloy is slightly lower than that of forging Ti40 alloy. The combustion products of Ti-25V-15Cr alloy and Ti40 alloy are mainly composed of a mixture of Ti oxide and V oxide, and the substrate. The area of the oxide in the combustion product zone of LSF Ti-25V-15Cr is slightly smaller than that of forging Ti40 alloy. Moreover, the distinct segregation of V and Cr at the grain boundary and subgrain boundary in the heat affected zone is found in LSF Ti-25V-15Cr alloy. The formation of the dendrites and subgrains in LSF Ti-25V-15Cr alloy increases the micro-defect and leads to the better diffusion capacity of V and Cr, which is responsible for the better resistance to burning of LSF Ti-25V-15Cr than that of forging Ti40.
The burn-resistant property of laser solid forming(LSF) Ti-25V-15Cr alloy was studied, and compared with that of forging Ti40 alloy. The burn-resistant mechanism was disclosed by combining the analysis of the microstructure of the alloy and the combustion products. The results show that the burning rate of Ti-25V-15Cr alloy is slightly lower than that of forging Ti40 alloy. The combustion products of Ti-25V-15Cr alloy and Ti40 alloy are mainly composed of a mixture of Ti oxide and V oxide, and the substrate. The area of the oxide in the combustion product zone of LSF Ti-25V-15Cr is slightly smaller than that of forging Ti40 alloy. Moreover, the distinct segregation of V and Cr at the grain boundary and subgrain boundary in the heat affected zone is found in LSF Ti-25V-15Cr alloy. The formation of the dendrites and subgrains in LSF Ti-25V-15Cr alloy increases the micro-defect and leads to the better diffusion capacity of V and Cr, which is responsible for the better resistance to burning of LSF Ti-25V-15Cr than that of forging Ti40.
引文
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[3]Lai Yunjin(赖运金),Zhang Pingxiang(张平祥),Xin Shewei(辛社伟)et al.Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2015,44(8):2067
[4]Zhao Yongqing,Xin Shewei,Zeng Weidong et al.Journal of Alloys and Compounds[J],2009,481:190
[5]Han Yuanfei,Zeng Weidong,Zhao Yongqing et al.Materials and Design[J],2010,31:4380
[6]Zhu Yanchun,Zeng Weidong,Zhang Fusheng et al.Materials Science and Engineering A[J],2012,553:112
[7]Zhu Yanchun,Zeng Weidong,Zhao Yongqing et al.Materials Science and Engineering A[J],2012,552:384
[8]Lai Yunjin,Xin Shewei,Zhang Pingxiang et al.International Journal of Minerals,Metallurgy and Materials[J],2016,23(5):581
[9]Zeng W D,Shu Y,Zhang X M et al.Materials Science and Technology[J],2008,24(10):1222
[10]Lei Liming(雷立明),Huang Xu(黄旭),Sun Fusheng(孙福生)et al.Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2004,33(5):498
[11]Zhang Saifei,Zeng Weidong,Zhou Dadi et al.Materials Letters[J],2016,166:317
[12]Zhang Saifei,Zeng Weidong,Gao Xiongxiong et al.Journal of Alloys and Compounds[J],2016,684:201
[13]Zhang Saifei,Zeng Weidong,Zhou Dadi et al.Journal of Materials Engineering and Performance[J],2015,24(11):4377
[14]Huang Weidong(黄卫东).Laser Solid Forming(激光立体成形)[M].Xian:Northwestern Polytechnical University Press,2007:1~20,340
[15]Huang Weidong,Lin Xin.3D Printing[J],2014,1(3):156
[16]Wang Huamming(王华明).Defense Manufacturing Technology(国防制造技术)[J],2013,6(3):5
[17]Wu X,Sharman R,Mei J et al.Materials and Design[J],2004,25:103
[18]Wang Fude,Mei J,Wu Xinhua et al.Applied Surface Science[J],2006,253:1424
[19]Zhang Fengying,Liu Tong,Zhao Hanyu et al.The International Journal of Advanced Manufacturing Technology[J]2017,46(3):634
[20]Zhu Kangying(朱康英),Zhao Yongqing(赵永庆),Qu Henglei(曲恒磊).Rare Metal Materials and Engineering(稀有金属材料与程)[J],2002,31(1):17
[21]Mi Guangbao,Huang Xu,Chao Jinxia et al.Transactions of Nonferrous Metals Society of China[J],2013,23:2070
[22]Zhao Yongqing,Zhu Kangying,Qu Henglei et al.Materials Science&Engineering A[J],2000,282(1):153
[23]Huang Xihu(黄希祜).Principles of Iron and Steel Metallurgy(钢铁冶金原理)[M].Beijing:Metallurgical Industry Press,2012:242
[24]Gerhard Neumann,Cornelis Tuijn.Self-Diffusion and Impurity Diffusion in Pure Metals[M].Oxford:Pergamon,2008:151