Effect of Heat Inputs on Microstructure and Properties of QP1180 Steel Laser Welded Joints

Tiancai Zhu; Xiaonan Wang; Wengang Chen; Zengrong Hu; Yong Xie; Bin Yang; Qiuxiang Yu

doi:10.3788/LOP57.051406

Laser & Optoelectronics Progress, Volume. 57, Issue 5, 051406(2020)

Effect of Heat Inputs on Microstructure and Properties of QP1180 Steel Laser Welded Joints

Tiancai Zhu^1,2, Xiaonan Wang^2、*, Wengang Chen¹, Zengrong Hu², Yong Xie¹, Bin Yang², and Qiuxiang Yu^2,3

Author Affiliations

¹School of Machinery and Traffic, Southwest Forestry University, Kunming, Yunnan 650224, China

²School of Iron and Steel, Soochow University, Suzhou, Jiangsu 215021, China

³School of Metallurgical Engineering, Anhui University of Technology, Maanshan, Anhui 243032, China

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Figures & Tables(10)

Fig. 1. Microstructure SEM images of QP1180 high strength steel. (a) Low magnification of BM; (b) I area enlargement

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Fig. 2. XRD pattern of QP1180 high strength steel

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Fig. 3. Schematic of tailored blank laser welding

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Fig. 10. Photos of base metal and weld joints after Erichsen test. (a) BM; (b) 21 J/mm; (c) 29 J/mm; (d) 36 J/mm

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Table 1. Chemical composition of QP1180 high strength steel
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Table 1. Chemical composition of QP1180 high strength steel
Element C Si Mn Nb Ti V S P Fe
Mass fraction /% 0.240 1.500 2.500 0.530 0.010 0.100 ≤0.010 ≤0.005 Bal.

Table 2. Mechanical properties of QP1180 high strength steel
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Table 2. Mechanical properties of QP1180 high strength steel
Parameter Yield strength /MPa Tensile strength /MPa Elongation /% Hardness /HV
Value 1020 1160 21.9 ~385

Table 3. Welding parameters of experimental steel
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Table 3. Welding parameters of experimental steel
P /kW v /(m·mi $\begin{matrix} {n^{-}}^{1} \end{matrix}$ ) E /(J·mm^-1) Protective gas
1.0 14
1.5 4.2 21 99.9% Ar
2.0 29
2.5 36

Table 4. Width and minimal hardness of softened zone in full-penetration weld joints
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Table 4. Width and minimal hardness of softened zone in full-penetration weld joints
Heat input /(J·mm^-1) Width of softenedzone /μm Minimumhardness /HV
21 150 357
29 200 354
36 300 346

Table 5. Tensile properties of welded joints
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Table 5. Tensile properties of welded joints
Heat input /(J·mm^-1) YS/MPa TS/MPa Elongation /% Fracture position
14 310 327 4.6 WS
21 1015 1150 19.3
29 1008 1160 18.2 BM
36 1014 1140 20.1

Table 6. Results of Erichsen test
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Table 6. Results of Erichsen test
Heat input /(J·mm^-1) Erichsen value /mm Crack initiation location
14 3.5(52%)
21 5.1(76%) FZ
29 4.9(73%) FZ
36 4.7(70%) FZ

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Tiancai Zhu, Xiaonan Wang, Wengang Chen, Zengrong Hu, Yong Xie, Bin Yang, Qiuxiang Yu. Effect of Heat Inputs on Microstructure and Properties of QP1180 Steel Laser Welded Joints[J]. Laser & Optoelectronics Progress, 2020, 57(5): 051406

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