Study on the Effect of Ni Addition on the Microstructure and Properties of NiTi Alloy Coating on AISI 316 L Prepared by Laser Cladding
This paper investigated 55 NiTi commercial alloy powder and 55 NiTi with 5% pure Ni mixed powder (55 NiTi + 5 Ni) coatings fabricated by laser cladding to study the effect of extra Ni addition on the microstructure and properties of the coating. The XRD and EDS results show that the major phases in...
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doaj-5b0efb4f25774769a02a16eac44f5e282021-08-26T14:00:15ZengMDPI AGMaterials1996-19442021-08-01144373437310.3390/ma14164373Study on the Effect of Ni Addition on the Microstructure and Properties of NiTi Alloy Coating on AISI 316 L Prepared by Laser CladdingYuqiang Feng0Zexu Du1Zhengfei Hu2Shanghai Key Laboratory for R&D and Application of Metallic Functional Materials, School of Materials Science and Engineering, Tongji University, Shanghai 201804, ChinaShanghai Key Laboratory for R&D and Application of Metallic Functional Materials, School of Materials Science and Engineering, Tongji University, Shanghai 201804, ChinaShanghai Key Laboratory for R&D and Application of Metallic Functional Materials, School of Materials Science and Engineering, Tongji University, Shanghai 201804, ChinaThis paper investigated 55 NiTi commercial alloy powder and 55 NiTi with 5% pure Ni mixed powder (55 NiTi + 5 Ni) coatings fabricated by laser cladding to study the effect of extra Ni addition on the microstructure and properties of the coating. The XRD and EDS results show that the major phases in the coatings were NiTi and Ni<sub>3</sub>Ti. Besides that, a second phase like Ni<sub>4</sub>Ti<sub>3</sub>, Fe<sub>2</sub>Ti, and NiTi<sub>2</sub> was also detected, among which, NiTi<sub>2</sub> was only found in 55 NiTi coating. The proportion of the phase composition in the coating was calculated via the software Image-Pro Plus. The hardness of the cladding layer reaches 770–830 HV, which was almost four times harder than the substrate, and the hardness of 55 NiTi + 5 Ni coating was around 8% higher than that of 55 NiTi coating. The wear resistance of the 55 NiTi + 5 Ni coating was also better; the wear mass loss decreased by about 13% and with a smaller friction coefficient compared with the 55 NiTi coating. These results are attributed to the solid solution strengthening effect caused by Ni addition and the second phase strengthening effect caused by the content increase of the Ni<sub>3</sub>Ti phase in the cladding layer.https://www.mdpi.com/1996-1944/14/16/4373laser claddingNiTi alloymicrostructurewear |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Yuqiang Feng Zexu Du Zhengfei Hu |
spellingShingle |
Yuqiang Feng Zexu Du Zhengfei Hu Study on the Effect of Ni Addition on the Microstructure and Properties of NiTi Alloy Coating on AISI 316 L Prepared by Laser Cladding Materials laser cladding NiTi alloy microstructure wear |
author_facet |
Yuqiang Feng Zexu Du Zhengfei Hu |
author_sort |
Yuqiang Feng |
title |
Study on the Effect of Ni Addition on the Microstructure and Properties of NiTi Alloy Coating on AISI 316 L Prepared by Laser Cladding |
title_short |
Study on the Effect of Ni Addition on the Microstructure and Properties of NiTi Alloy Coating on AISI 316 L Prepared by Laser Cladding |
title_full |
Study on the Effect of Ni Addition on the Microstructure and Properties of NiTi Alloy Coating on AISI 316 L Prepared by Laser Cladding |
title_fullStr |
Study on the Effect of Ni Addition on the Microstructure and Properties of NiTi Alloy Coating on AISI 316 L Prepared by Laser Cladding |
title_full_unstemmed |
Study on the Effect of Ni Addition on the Microstructure and Properties of NiTi Alloy Coating on AISI 316 L Prepared by Laser Cladding |
title_sort |
study on the effect of ni addition on the microstructure and properties of niti alloy coating on aisi 316 l prepared by laser cladding |
publisher |
MDPI AG |
series |
Materials |
issn |
1996-1944 |
publishDate |
2021-08-01 |
description |
This paper investigated 55 NiTi commercial alloy powder and 55 NiTi with 5% pure Ni mixed powder (55 NiTi + 5 Ni) coatings fabricated by laser cladding to study the effect of extra Ni addition on the microstructure and properties of the coating. The XRD and EDS results show that the major phases in the coatings were NiTi and Ni<sub>3</sub>Ti. Besides that, a second phase like Ni<sub>4</sub>Ti<sub>3</sub>, Fe<sub>2</sub>Ti, and NiTi<sub>2</sub> was also detected, among which, NiTi<sub>2</sub> was only found in 55 NiTi coating. The proportion of the phase composition in the coating was calculated via the software Image-Pro Plus. The hardness of the cladding layer reaches 770–830 HV, which was almost four times harder than the substrate, and the hardness of 55 NiTi + 5 Ni coating was around 8% higher than that of 55 NiTi coating. The wear resistance of the 55 NiTi + 5 Ni coating was also better; the wear mass loss decreased by about 13% and with a smaller friction coefficient compared with the 55 NiTi coating. These results are attributed to the solid solution strengthening effect caused by Ni addition and the second phase strengthening effect caused by the content increase of the Ni<sub>3</sub>Ti phase in the cladding layer. |
topic |
laser cladding NiTi alloy microstructure wear |
url |
https://www.mdpi.com/1996-1944/14/16/4373 |
work_keys_str_mv |
AT yuqiangfeng studyontheeffectofniadditiononthemicrostructureandpropertiesofnitialloycoatingonaisi316lpreparedbylasercladding AT zexudu studyontheeffectofniadditiononthemicrostructureandpropertiesofnitialloycoatingonaisi316lpreparedbylasercladding AT zhengfeihu studyontheeffectofniadditiononthemicrostructureandpropertiesofnitialloycoatingonaisi316lpreparedbylasercladding |
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