Nb2O5对铁基合金激光熔覆层裂纹敏感性的影响

晁明举; 余菊美; 梁二军; 袁斌

高级检索

ISSN 1001-3806CN 51-1125/TN 网站地图

留言板

尊敬的读者、作者、审稿人, 关于本刊的投稿、审稿、编辑和出版的任何问题, 您可以本页添加留言。我们将尽快给您答复。谢谢您的支持!

姓名
邮箱
手机号码
标题
留言内容
验证码

Nb2O5对铁基合金激光熔覆层裂纹敏感性的影响

晁明举 , 余菊美 , 梁二军 , 袁斌

文章导航 > 激光技术 > 2005 > 29(6): 568-571

引用本文:

Citation:

Nb2O5对铁基合金激光熔覆层裂纹敏感性的影响

1.
郑州大学, 物理工程学院, 教育部材料物理重点实验室, 郑州, 450052

作者简介: 晁明举(1964- ),男,博士,副教授,主要研究方向为激光与物质相互作用.E-mail:chaomingju@zzu.edu.cn.

基金项目:
河南省高校创新人才基金资助项目(1999-125);河南省高校青年骨干教师资助计划项目基金资助(2003-218)
中图分类号: TG665

Effect of Nb2O5 on the cracking susceptibility of laser-clad Fe-based coating

1.
Key Laboratory of Material Physics of Ministry of Education, Department of Physics, Zhengzhou University, Zhengzhou 450052, China
CLC number: TG665

摘要: 在45#钢基底上进行了铁基合金和铁基合金加Nb2O5的激光熔覆对比实验.通过工艺参数和Nb2O5含量的优选,获得了成形良好、无裂纹、组织致密均匀的高质量铁基激光熔覆层.采用渗透法观察熔覆层表面裂纹,利用金相显微镜和扫描电镜观察熔覆层横断面的显微组织,使用X射线衍射仪对熔覆层进行物相分析,并测试了熔覆层的硬度.分析结果表明,G312+0.6%Nb2O5(质量分数)熔覆层组织为细小的先共晶析出的碳化物等强化相均匀分布在由γ(Fe,Ni)固溶体和多种金属间化合物组成的共晶体中,且生长方向不同.Nb2O5改善铁基熔覆层抗开裂能力的原因一方面是Nb占据晶界增强了晶界结合,另一方面,部分Nb2O5受C的还原作用生成NbC,先共晶析出,成为异质核,提高了凝固结晶过程中的形核率,使得熔覆层组织得以细化,且降低了熔体中的C浓度,减少了Cr(Fe)碳化物脆性相的体积分数,熔覆层韧性增强,裂纹敏感性降低.
- 激光熔覆 /
- 裂纹 /
- 显微组织 /
- 铁基合金 /
- Nb2O5
Abstract: The experiments of laser-clad Fe-based alloy powder doped with and without Nb2O5 on medium carbon steel 45 by powder feeding are carried out.A crack-free,fine and homogeneous Fe-based coating is obtained at a proper amount of Nb2O5-doped under suitable optimizing processing parameters.The effect on microstructure of different amounts of Nb2O5 to Fe-based coating is studied with scanning electron microscopy,optical microscopy and Xray diffraction.The cracking on the surface of the coatings is observed and the hardness in the cross-section of the clad layers is measured.It is reveled that lots and lots of fine dendritic crystal grown along different directions in the cladding layers of G312+0.6% Nb2O5(mass fraction) are uniformly dispersed in the matrix,which is a mixture containing γ(Fe,Ni) solid-solution and chromium carbide or boride.It is considered that the improvement of properties of the coating is due to the following two reasons.On the one hand,Nb atoms can enhance intercrystalline cohesion when they are located in the crystal boundary.On the other hand,particles of NbC,reduced from Nb2O5 by C at high temperature and deposited primarily from the alloy solution,become new crystalline nuclei and increase the nuclear rate in solidification,which leads to the dendritic turn to fine.The cracking susceptibility of the Fe-based coating doped a proper content of Nb2O5 can be reduced because of the decrease in amount of crisp parts in the layers and increase in tenacity of the coatings.

[1]	WU X L,CHEN G N.Nonequilibrium microstructures and their evolution in a Fe-Cr-W-Ni-C laser clad coating[J].Materials Science and Engineering,1999,A270(2):183～189.
[2]	SONG W L,ECHIGOYA J,ZHU B D et al.Effects of Co on the cracking susceptibility and the microstructure of Fe-Cr-Ni laser-clad layer[J].Surface and Coatings Technology,2001,138(2～3):291～295.
[3]	李强,张永忠,李劲风 et al.激光熔覆316L不锈钢涂层的结构与腐蚀性能[J].激光技术,2004,28(3):237～270.
[4]	余菊美,晁明举,梁二军 et al.TiO2对铁基合金激光熔覆层组织和性能的影响[J].应用激光,2003,23(4):201～204.
[5]	张庆茂,何金江,刘文今 et al.激光熔覆Zr/FeCSiB涂层的组织和性能[J].激光技术,2003,27(2):81～84,93.
[6]	周二华,曾晓雁,吴新伟 et al.A3钢表面激光熔覆Fe-WC金属陶瓷复合层的研究[J].激光技术,1997,21(1):34～37.
[7]	机械制造工艺材料技术手册编写组.机械制造工艺材料技术手册[M].北京:机械工业出版社,1993.570.
[8]	WATANABE H,MUROGA T.The effects of oversized solute addition on microstructural evolution in Fe-Cr-Ni alloys during electron irradiation[J].Journal of Nuclear Materials,1996,239(1～3):95～98.
[9]	SU Y L,CHEN K Y.The influence of niobium,chromium,molybdenum and carbon on the sliding wear behavior of nickel-base hardfacing alloys[J].Wear,1997,209(1～2):160～170.
[10]	林滋泉,敖列哥,郝森.鞍钢钒、钛、铌微合金钢的应用与开发[J].钢铁钒钛,2001,22(1):1～6.
[11]	YAMAMOTO K,KIMURA Y,WE F G et al.Design of laves phase strengthened ferritic heat resisting steels in the Fe-Cr-Nb(-Ni) system[J].Materials Science and Engineering,2002,A329～A331:249～254.
[12]	宋武林,朱蓓蒂,罗慧倩 et al.Fe-Cr-Ni合金激光熔覆层显微缺陷及开裂行为的研究[J].应用激光,1996,16(2):62～65.
[13]	刘建辉,沈苏,董一诚.碳还原氧化铌机理的研究[J].有色冶炼,1999,28(6):27～29,45.
[14]	尚家香,赵栋梁,王崇愚.合金化元素Nb在铁γ相中的占位倾向及对晶界的影响[J].中国科学,2003,E33(1):19～24.

[1]	陈顺高 , 张晓明 , 郑启池 , 李瑞峰 . CeO₂对激光熔覆Ni60合金涂层组织及性能的影响. 激光技术, 2017, 41(6): 904-908. doi: 10.7510/jgjs.issn.1001-3806.2017.06.027
[2]	李胜 , 胡乾午 , 曾晓雁 . 激光熔覆专用铁基合金粉末的研究进展. 激光技术, 2004, 28(6): 591-594.
[3]	龚佑品 , 鲁玮瑗 , 袁晓敏 . 激光熔覆TiB2增强Co基合金涂层的组织与性能. 激光技术, 2008, 32(2): 122-124.
[4]	宋传旺 , 李明喜 . 纳米CeO2对激光熔覆Ni基合金层组织与性能的影响. 激光技术, 2006, 30(3): 228-231.
[5]	项东 , 许斌 , 刘科高 . W6Mo5Cr4V2激光熔覆陶瓷涂层显微组织及性能分析. 激光技术, 2003, 27(5): 434-436.
[6]	武万良 , 黄文荣 , 杨德庄 , 孙荣禄 . Ti-6Al-4V合金基体上激光熔覆Ti+TiC粉末的显微组织. 激光技术, 2003, 27(4): 307-310.
[7]	杜利平 , 梁二军 , 陈长青 , 雒江涛 . CeO2对镍基碳化钨激光熔覆层性能的影响. 激光技术, 2002, 26(5): 354-356.
[8]	张春良 . 核阀零件激光熔覆Co基涂层的组织研究. 激光技术, 2001, 25(2): 129-133.
[9]	刘志勤 , 张洪欣 , 王开富 , 郑克全 . 激光熔覆金属陶瓷复合合金层的组织与性能研究. 激光技术, 1998, 22(1): 46-49.
[10]	李刚 , 刘丽 , 侯俊英 , 水东莉 , 陈永君 , 唐海鹏 . 激光熔覆Ni-Zr-Nb-Al非晶复合涂层组织结构及性能研究. 激光技术, 2011, 35(2): 185-188. doi: 10.3969/j.issn.1001-3806.2011.02.012
[11]	张三川 , 姚建铨 , 梁二军 . 激光熔覆进展与熔覆合金设计. 激光技术, 2002, 26(3): 204-207.
[12]	李明喜 , 何宜柱 , 孙国雄 . IF钢表面激光熔覆Co基合金/SiCp涂层的研究. 激光技术, 2003, 27(2): 119-121.
[13]	杨宁 , 李立凯 , 晁明举 . 激光熔覆原位生长VC-WxC颗粒增强镍基涂层研究. 激光技术, 2012, 36(5): 627-631. doi: 10.3969/j.issn.1001-3806.2012.05.013
[14]	刘秀波 , 王华明 . 工艺参数对TiAl合金激光熔覆复合涂层的影响. 激光技术, 2006, 30(1): 67-69.
[15]	王梦瑶 , 朱海红 , 祁婷 , 张虎 , 曾晓雁 . 选区激光熔化成形Al-Si合金及其裂纹形成机制研究. 激光技术, 2016, 40(2): 219-222. doi: 10.7510/jgjs.issn.1001-3806.2016.02.014
[16]	余阳春 , 王春明 , 余圣甫 . 5A06 铝合金的激光填丝焊接头组织与性能. 激光技术, 2010, 34(1): 34-36,52. doi: 10.3969/j.issn.1001-3806.2010.01.010
[17]	赵亚凡 , 陈传忠 . 激光熔覆金属陶瓷涂层开裂的机理及防止措施. 激光技术, 2006, 30(1): 16-19,22.
[18]	袁庆龙 , 冯旭东 , 曹晶晶 , 苏志俊 . 扫描速率对激光熔覆层组织及耐蚀性的影响. 激光技术, 2011, 35(2): 163-166. doi: 10.3969/j.issn.1001-3806.2011.02.006
[19]	斯松华 , 袁晓敏 , 何宜柱 . 激光熔覆Ni基SiC合金涂层组织与性能的研究. 激光技术, 2002, 26(5): 324-326.
[20]	张维平 , 马玉涛 , 刘硕 . 激光熔覆原位自生复合材料涂层的研究. 激光技术, 2005, 29(1): 38-39,55.

点击查看大图

计量

文章访问数: 3104
HTML全文浏览量: 647
PDF下载量: 472
被引次数: 0

Nb2O5对铁基合金激光熔覆层裂纹敏感性的影响

作者简介: 晁明举(1964- ),男,博士,副教授,主要研究方向为激光与物质相互作用.E-mail:chaomingju@zzu.edu.cn

1. 郑州大学, 物理工程学院, 教育部材料物理重点实验室, 郑州, 450052

收稿日期: 2004-09-17
录用日期: 2004-10-25
网络出版日期: 2005-11-25

基金项目: 河南省高校创新人才基金资助项目(1999-125);河南省高校青年骨干教师资助计划项目基金资助(2003-218)

关键词:

摘要: 在45#钢基底上进行了铁基合金和铁基合金加Nb2O5的激光熔覆对比实验.通过工艺参数和Nb2O5含量的优选,获得了成形良好、无裂纹、组织致密均匀的高质量铁基激光熔覆层.采用渗透法观察熔覆层表面裂纹,利用金相显微镜和扫描电镜观察熔覆层横断面的显微组织,使用X射线衍射仪对熔覆层进行物相分析,并测试了熔覆层的硬度.分析结果表明,G312+0.6%Nb2O5(质量分数)熔覆层组织为细小的先共晶析出的碳化物等强化相均匀分布在由γ(Fe,Ni)固溶体和多种金属间化合物组成的共晶体中,且生长方向不同.Nb2O5改善铁基熔覆层抗开裂能力的原因一方面是Nb占据晶界增强了晶界结合,另一方面,部分Nb2O5受C的还原作用生成NbC,先共晶析出,成为异质核,提高了凝固结晶过程中的形核率,使得熔覆层组织得以细化,且降低了熔体中的C浓度,减少了Cr(Fe)碳化物脆性相的体积分数,熔覆层韧性增强,裂纹敏感性降低.

English Abstract

Effect of Nb2O5 on the cracking susceptibility of laser-clad Fe-based coating

1. Key Laboratory of Material Physics of Ministry of Education, Department of Physics, Zhengzhou University, Zhengzhou 450052, China

Received Date: 2004-09-17
Accepted Date: 2004-10-25
Available Online: 2005-11-25

Abstract: The experiments of laser-clad Fe-based alloy powder doped with and without Nb2O5 on medium carbon steel 45 by powder feeding are carried out.A crack-free,fine and homogeneous Fe-based coating is obtained at a proper amount of Nb2O5-doped under suitable optimizing processing parameters.The effect on microstructure of different amounts of Nb2O5 to Fe-based coating is studied with scanning electron microscopy,optical microscopy and Xray diffraction.The cracking on the surface of the coatings is observed and the hardness in the cross-section of the clad layers is measured.It is reveled that lots and lots of fine dendritic crystal grown along different directions in the cladding layers of G312+0.6% Nb2O5(mass fraction) are uniformly dispersed in the matrix,which is a mixture containing γ(Fe,Ni) solid-solution and chromium carbide or boride.It is considered that the improvement of properties of the coating is due to the following two reasons.On the one hand,Nb atoms can enhance intercrystalline cohesion when they are located in the crystal boundary.On the other hand,particles of NbC,reduced from Nb2O5 by C at high temperature and deposited primarily from the alloy solution,become new crystalline nuclei and increase the nuclear rate in solidification,which leads to the dendritic turn to fine.The cracking susceptibility of the Fe-based coating doped a proper content of Nb2O5 can be reduced because of the decrease in amount of crisp parts in the layers and increase in tenacity of the coatings.