Optimization of Hardness Testing Model of High-Speed Iron Wheel by Laser-Induced Breakdown Spectroscopy

Ai-guo OUYANG; Tong-zheng LIN; Jun HU; Bin YU; Yan-de LIU

doi:10.3964/j.issn.1000-0593(2022)10-3109-07

Spectroscopy and Spectral Analysis, Volume. 42, Issue 10, 3109(2022)

Optimization of Hardness Testing Model of High-Speed Iron Wheel by Laser-Induced Breakdown Spectroscopy

Ai-guo OUYANG^*, Tong-zheng LIN, Jun HU, Bin YU, and Yan-de LIU

Author Affiliations

School of Mechanotronics and Vehicle Engineering, East China Jiaotong University, Nanchang 330013, China

show less

Abstract Get PDF(in Chinese)

Figures & Tables(13)

Fig. 1. Hardness detection points using QNESS 10A high-precision micro-hardness tester

Download full size

View in Article

Fig. 2. Schematic diagram of LIBS system

Download full size

View in Article

Fig. 3. Relationships between the spectral line strengths of matrix elements and alloy elements and the hardness of 8 samples

Download full size

View in Article

Fig. 4. Correlations between the strength ratio of ion lines to atomic lines of matrix elements and alloying elements and sample hardness
(a): Correlation between the strength ratio of Fe Ⅱ 238.203 8 nm to Fe Ⅰ 404.581 3 nm and sample hardness; (b): Correlation between the strength ratio of Cr Ⅱ 276.258 nm to Cr Ⅰ 425.433 1 nm and sample hardness

Download full size

View in Article

Fig. 5. Correlation between the spectral line strength ratio of alloying elements to matrix elements and sample hardness
(a): Correlation between the strength ratio of Mo Ⅰ 313.259 4 nm to Fe Ⅰ 358.119 3 nm and sample hardness; (b): Correlation between the strength ratio of W Ⅰ 283.138 nm to Fe Ⅰ 358.119 3 nm and sample hardness

Download full size

View in Article

Fig. 6. The prediction results of the model established using the full-band spectral line intensities after SNV pretreatment

Download full size

View in Article

Fig. 7. Prediction results of the model established by combining the original data of spectral line intensity with the spectral line intensity ratio

Download full size

View in Article

Table 1. Main chemical components of HS7 steel (Wt%)
View table
View in Article
Table 1. Main chemical components of HS7 steel (Wt%)
Element Mass fraction/% Element Mass fraction/%
C 4.401 3 W 6.047 5
P 0.037 5 V 2.271 3
Si 0.202 5 Mn 0.186 7
Cr 4.01 Co 1.418 3
Mo 5.29

Table 2. Measured vickers hardness values of the samples

View table

View in Article

Table 2. Measured vickers hardness values of the samples

Number	Measurement point 1 value/HV	Measurement point 2 value/HV	Measurement point 3 value/HV	Measurement point 4 value/HV	Measurement point 5 value/HV	Mean value /HV
1^#	789	809	796	794	783	794.2
2^#	787	821	809	824	807	809.6
3^#	829	807	827	823	823	821.8
4^#	810	801	816	768	780	795.0
5^#	788	791	786	792	796	790.6
6^#	804	802	808	791	805	802.0
7^#	819	798	808	817	805	809.4
8^#	805	804	809	814	809	808.2

Table 3. Evaluation index results of the model

View table

View in Article

Table 3. Evaluation index results of the model

Variable	Method	Pretreatment method	LVs	Calibration set		Prediction set
Variable	Method	Pretreatment method	LVs	$R_{c}^{2}$	RMSEC	$R_{p}^{2}$	RMSEP
谱线强度	PLS	无	17	0.996 8	0.547 2	0.894 9	3.402 2
		SNV	17	0.982 2	1.272 1	0.902 0	2.432 6
		S-G卷积二阶导	12	0.961 6	1.965 3	0.903 6	3.240 5
		高斯滤波	17	0.989 5	1.041 6	0.908 7	2.971 5

Table 4. Spectral lines of manually selected matrix elements and alloy elements

View table

View in Article

Table 4. Spectral lines of manually selected matrix elements and alloy elements

谱线类型	谱线波长/nm
Fe Ⅰ	248.327 1, 248.814 3, 249.064 4, 252.284 9, 271.902 7, 278.810 5, 344.060 6, 358.119 3, 371.993 5, 373.486 4, 373.713 2, 374.556 1, 374.948 5, 375.823 3, 382.042 5, 385.991 1, 404.581 3, 438.354 5
Fe Ⅱ	234.349 5, 238.203 8, 239.562 5, 240.488 6, 249.326 4, 258.587 6, 259.836 9, 260.708 7, 261.187 4, 273.954 7, 274.932 2, 275.573 7
Cr Ⅰ	357.868 2, 359.348 1, 360.532 0, 425.433 1, 427.480 6, 428.973 3, 520.450 5
Cr Ⅱ	205.559, 206.154, 206.546, 267.719, 276.258, 276.655, 283.563, 284.324, 285.567, 286.51
Mo Ⅰ	313.259 4, 315.816 7, 317.034 4, 319.397 9, 320.883 8, 344.712 4, 379.825 2, 386.410 4, 390.295 3, 406.988 2, 418.832 4, 441.169 5, 550.649 4, 553.303 1, 557.044 4
W Ⅰ	255.135, 268.142, 272.435, 283.138, 289.644, 294.699, 321.556, 361.752, 400.875, 407.436, 429.461, 430.211

Table 5. Spectral lines used to calculate spectral line intensity ratios

View table

View in Article

Table 5. Spectral lines used to calculate spectral line intensity ratios

谱线比值类别	构造谱线强度比值的谱线/nm
Fe Ⅱ/Fe Ⅰ	Fe Ⅰ: 248.327 1, 248.814 3, 249.064 4, 252.284 9, 271.902 7, 278.810 5, 344.060 6, 358.119 3, 371.993 5, 373.486 4, 373.713 2, 374.556 1, 374.948 5, 375.823 3, 382.042 5, 385.991 1, 404.581 3, 438.354 5 Fe Ⅱ: 240.488 6, 249.326 4, 258.587 6, 259.836 9, 260.708 7, 261.187 4, 273.954 7, 274.932 2, 275.573 7
Cr Ⅱ/Cr Ⅰ	Cr Ⅰ: 357.868 2, 359.348 1, 360.532, 425.433 1, 427.480 6, 428.973 3 Cr Ⅱ: 267.719, 276.258, 276.655, 283.563, 284.324, 285.567, 286.51
Mo Ⅰ/Fe Ⅰ	Mo Ⅰ: 313.259 4, 315.816 7, 317.034 4, 319.397 9, 320.883 8, 344.712 4, 379.825 2, 386.410 4, 390.295 3, 406.988 2, 418.832 4, 441.169 5 Fe Ⅰ: 248.327 1, 248.814 3, 249.064 4, 252.284 9, 271.902 7, 278.810 5, 344.060 6, 358.119 3, 371.993 5, 373.486 4, 373.713 2, 374.556 1, 374.948 5, 375.823 3, 382.042 5, 385.991 1, 404.581 3, 438.354 5
W Ⅰ/Fe Ⅰ	W Ⅰ: 255.135, 268.142, 272.435, 283.138, 289.644, 294.699, 321.556, 361.752, 400.875, 407.436, 429.461, 430.211 Fe Ⅰ: 248.327 1, 248.814 3, 249.064 4, 252.284 9, 271.902 7, 278.810 5, 344.060 6, 358.119 3, 371.993 5, 373.486 4, 373.713 2, 374.556 1, 374.948 5, 375.823 3, 382.042 5, 385.991 1, 404.581 3, 438.354 5

Table 6. Evaluation index results of the model

View table

View in Article

Table 6. Evaluation index results of the model

Variable	Method	Pretreatment method	LVs	Calibration set		Prediction set
Variable	Method	Pretreatment method	LVs	$R_{c}^{2}$	RMSEC	$R_{p}^{2}$	RMSEP
谱线强度+ 谱线强度比值	PLS	无	16	0.993 3	0.785 1	0.944 1	2.436 5
		SNV	15	0.960 0	1.932 6	0.909 1	2.902 7
		S-G卷积二阶导	12	0.990 8	0.939 5	0.925 5	2.995 4
		高斯滤波	15	0.971 1	1.674 4	0.920 7	2.781 5

Tools

Get Citation

Copy Citation Text

Ai-guo OUYANG, Tong-zheng LIN, Jun HU, Bin YU, Yan-de LIU. Optimization of Hardness Testing Model of High-Speed Iron Wheel by Laser-Induced Breakdown Spectroscopy[J]. Spectroscopy and Spectral Analysis, 2022, 42(10): 3109

Download Citation

EndNote(RIS)BibTex Plain Text

Set citation alerts for article

Save article for my favorites