Microstructure and properties of laser cladding coating at the end of L415/316L bimetal composite pipe

2021 ◽  
pp. 104568
Author(s):  
Liying Li ◽  
Xianwei Niu ◽  
Bin Han ◽  
Lixin Song ◽  
Xueda Li
Keyword(s):  
Laser Cladding ◽  
Microstructure And Properties ◽  
Composite Pipe ◽  
Bimetal Composite Pipe ◽  
Bimetal Composite

Welding L415/316L Bimetal Composite Pipe Using Post-Internal-Welding Process

2020 ◽  
Vol 73 (3) ◽  
pp. 675-689
Author(s):  
Liying Li ◽  
Jun Xiao ◽  
Bin Han ◽  
Cong Zhou ◽  
Xiaolei Wang
Keyword(s):  
Welding Process ◽  
Composite Pipe ◽  
Bimetal Composite Pipe ◽  
Bimetal Composite

Ultrasonic Interface Wave for Interlaminar Crack Detection in Steel–Titanium Composite Pipe

2019 ◽  
Vol 141 (4) ◽  
Author(s):  
Fei Tian ◽  
Bing Li ◽  
Weimeng Zhou
Keyword(s):  
Crack Detection ◽  
Crack Depth ◽  
Excitation Frequency ◽  
Interfacial Crack ◽  
Wave Mode ◽  
Composite Pipe ◽  
Interface Wave ◽  
Interlaminar Crack ◽  
Bimetal Composite Pipe ◽  
Bimetal Composite

The bimetal composite pipe has found wide ranging applications in engineering owing to its excellent mechanical and physical performances. However, the interlaminar cracks which are usually invisible and inaccessible may occur in the bimetal composite pipe and are difficult to detect. The ultrasonic interface wave, which propagates along the interface with high displacement amplitudes and low dispersion at high frequencies, provides a promising nondestructive testing (NDT) method for detecting cracks in the bimetal composite pipe. In this study, the interlaminar crack detection method in the steel–titanium composite pipe is investigated analytically and experimentally by using interface wave. The interface wave mode in steel–titanium composite pipe is first identified and presented by theoretical analyses of dispersion curves and wave structures. The selection of suitable excitation frequency range for NDT is discussed as well. Then an experiment is conducted to measure the interface wave velocities, which are in good agreement with the corresponding numerical results. In addition, interlaminar cracks with different locations in steel–titanium composite pipe are effectively detected and located, both in the axial and circumferential directions. Finally, the relationship between the reflection coefficient and the crack depth is experimentally studied to predict the reflection behavior of interface wave with crack. The numerical and experimental results show the interface wave is sensitive to interfacial crack and has great potentials for nondestructive evaluation in the bimetal composite pipe.

scholarly journals 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 ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4373
Author(s):  
Yuqiang Feng ◽  
Zexu Du ◽  
Zhengfei Hu
Keyword(s):  
Laser Cladding ◽  
Niti Alloy ◽  
Second Phase ◽  
Content Increase ◽  
Strengthening Effect ◽  
Mixed Powder ◽  
Microstructure And Properties ◽  
Cladding Layer ◽  
Ni Addition ◽  
Aisi 316 L

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 Ni3Ti. Besides that, a second phase like Ni4Ti3, Fe2Ti, and NiTi2 was also detected, among which, NiTi2 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 Ni3Ti phase in the cladding layer.

Sign in / Sign up

Export Citation Format

Share Document