Study on the evaluation of the aging grade for the industrial heat-resistant steel by laser-induced breakdown spectroscopy

2021 ◽  
Author(s):  
Yongsheng Zhang ◽  
Meirong Dong ◽  
Junbin Cai ◽  
Yixiang Chen ◽  
Hongjie Chen ◽  
...  
Keyword(s):  
Laser Induced Breakdown Spectroscopy ◽  
Resistant Steel ◽  
Structure And Properties ◽  
Heat Resistant Steel ◽  
Metallographic Structure ◽  
Breakdown Spectroscopy ◽  
Heat Resistant ◽  
Laser Induced Breakdown

Heat-resistant steel is widely used in various industrial pressure-bearing equipment, and the change of metallographic structure and properties of steel is of great importance for the equipment function and safety....

Standard Reference Line Combined with One-Point Calibration-Free Laser-Induced Breakdown Spectroscopy (CF-LIBS) to Quantitatively Analyze Stainless and Heat Resistant Steel

2018 ◽  
Vol 72 (8) ◽  
pp. 1183-1188 ◽  
Author(s):  
Hongbo Fu ◽  
Huadong Wang ◽  
Junwei Jia ◽  
Zhibo Ni ◽  
Fengzhong Dong
Keyword(s):  
Trace Elements ◽  
Quantitative Analysis ◽  
Reference Line ◽  
Laser Induced Breakdown Spectroscopy ◽  
Resistant Steel ◽  
Heat Resistant Steel ◽  
Breakdown Spectroscopy ◽  
Heat Resistant ◽  
Laser Induced Breakdown ◽  
Calibration Free

Due to the influence of self-absorption of major elements, scarce observable spectral lines of trace elements, and relative efficiency correction of experimental system, accurate quantitative analysis with calibration-free laser-induced breakdown spectroscopy (CF-LIBS) is in fact not easy. In order to overcome these difficulties, standard reference line (SRL) combined with one-point calibration (OPC) is used to analyze six elements in three stainless-steel and five heat-resistant steel samples. The Stark broadening and Saha-Boltzmann plot of Fe are used to calculate the electron density and the plasma temperature, respectively. In the present work, we tested the original SRL method, the SRL with the OPC method, and intercept with the OPC method. The final calculation results show that the latter two methods can effectively improve the overall accuracy of quantitative analysis and the detection limits of trace elements.

A hybrid model combining wavelet transform and recursive feature elimination for running state evaluation of heat-resistant steel using laser-induced breakdown spectroscopy

The Analyst ◽  
2019 ◽  
Vol 144 (12) ◽  
pp. 3736-3745 ◽  
Author(s):  
Jianwei Huang ◽  
Meirong Dong ◽  
Shengzi Lu ◽  
Yishan Yu ◽  
Chunyi Liu ◽  
...  
Keyword(s):  
Wavelet Transform ◽  
Hybrid Model ◽  
Recursive Feature Elimination ◽  
Laser Induced Breakdown Spectroscopy ◽  
Resistant Steel ◽  
Heat Resistant Steel ◽  
Breakdown Spectroscopy ◽  
State Evaluation ◽  
Model Combining ◽  
Laser Induced Breakdown

Laser-induced breakdown spectroscopy is applied to evaluate the running state of steel by the hybrid model combining wavelet transform and recursive feature elimination.

Nanosecond laser-induced breakdown assisted by femtosecond laser pre-ionization in air: the effect on spatial resolution and continuous radiation

2020 ◽  
Vol 92 (2) ◽  
pp. 20701
Author(s):  
Bo Li ◽  
Xiaofeng Li ◽  
Zhifeng Zhu ◽  
Qiang Gao
Keyword(s):  
Femtosecond Laser ◽  
Spatial Resolution ◽  
Laser Induced Breakdown Spectroscopy ◽  
Nanosecond Laser ◽  
Breakdown Threshold ◽  
Powerful Technique ◽  
Breakdown Spectroscopy ◽  
Continuous Radiation ◽  
Laser Induced Breakdown

Laser-induced breakdown spectroscopy (LIBS) is a powerful technique for quantitative diagnostics of gases. The spatial resolution of LIBS, however, is limited by the volume of plasma. Here femtosecond-nanosecond dual-pulsed LIBS was demonstrated. Using this method, the breakdown threshold was reduced by 80%, and decay of continuous radiation was shortened. In addition, the volume of the plasma was shrunk by 85% and hence, the spatial resolution of LIBS was significantly improved.

Analysis of dimple shape on fractographic heat-resistant steel images

2018 ◽  
Vol 2018 (46) ◽  
pp. 34-37
Author(s):  
I. B. Ivasenko ◽  
◽  
O. R. Berehulyak ◽  
R. A. Vorobel ◽  
◽  
...  
Keyword(s):  
Resistant Steel ◽  
Heat Resistant Steel ◽  
Heat Resistant
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