Study on Microstructure and Mechanical Properties of Laser Welded Joints for Ultra-High Strength Steel 1700MS

Min Li; Youmin Rong; Lu Wang; Jiajun Xu

doi:10.3788/LOP222348

Laser & Optoelectronics Progress, Volume. 60, Issue 17, 1714004(2023)

Study on Microstructure and Mechanical Properties of Laser Welded Joints for Ultra-High Strength Steel 1700MS

Min Li¹, Youmin Rong², Lu Wang², and Jiajun Xu^2、*

Author Affiliations

¹Intelligent Manufacturing Institute, Jianghan University, Wuhan 430056, Hubei , China

²State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science and Technology, Wuhan 430074, Hubei , China

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Figures & Tables(12)

Fig. 1. Schematic diagram of tensile and metallographic specimens

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Fig. 2. Microstructure of martensitic steel 1700MS. (a) 500× optical microscope; (b) 4000× scanning electron microscope

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Fig. 3. Weld morphologies at different welding speeds. (a) 2.4 m/min; (b) 3.3 m/min; (c) 4.2 m/min; (d) 5.1 m/min; (e) 6.0 m/min; (f) 6.9 m/min^[17]

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Fig. 4. Schematic diagram of welding joint area division

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Fig. 5. Microstructure of welded joint (500×). (a) FZ; (b) CGHAZ; (c) FGHAZ; (d) ICHAZ; (e) SCHAZ I; (f) SCHAZ II

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Fig. 6. Microhardness test results of welded joint. (a) Hardness test path; (b) microhardness curve

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Fig. 7. Test results. (a) Stress-strain curves; (b) curve of tensile strength versus welding speed; (c) curve of elongation versus welding speed

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Table 1. Mechanical properties of martensitic steel 1700MS^[17]
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Table 1. Mechanical properties of martensitic steel 1700MS^[17]
Yield strength R_p0.2 /MPa Tensile strength R_m /MPa ElongationA₈₀ /%
1350-1700 1700-2000 3

Table 2. Chemical composition of martensitic steel 1700MS ^[17]
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Table 2. Chemical composition of martensitic steel 1700MS ^[17]
Element C Si Mn P S Cr Ni V Ti Cu Al Fe
Mass fraction /% 0.296 0.20 0.41 0.009 0.003 0.02 0.04 0.01 0.03 0.16 0.044 Bal.

Table 3. Welding process parameters^[17]
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Table 3. Welding process parameters^[17]
Welding parameter Value
Welding speed /（m·min^-1） 2.4，3.3，4.2，5.1，6.0，6.9

Table 4. Change of widths of FZ, UCHAZ, and ICHAZ with welding speed

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Table 4. Change of widths of FZ, UCHAZ, and ICHAZ with welding speed

Welding speed /（m·min^-1）	Upper width /mm			Bottom width /mm
Welding speed /（m·min^-1）	FZ	UCHAZ	ICHAZ	FZ	UCHAZ	ICHAZ
2.4	1.31	0.36	0.13	1.39	0.29	0.13
3.3	1.18	0.25	0.11	1.22	0.27	0.11
4.2	1.03	0.20	0.10	1.02	0.22	0.11
5.1	0.99	0.17	0.10	0.92	0.20	0.09
6.0	0.94	0.15	0.09	0.87	0.18	0.09
6.9	0.86	0.14	0.09	0.72	0.17	0.08

Table 5. Change of tensile strength with welding speed
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Table 5. Change of tensile strength with welding speed
Welding speed /（m·min^-1） 2.4 3.3 4.2 5.1 6.0 6.9 Base metal
Tensile strength /MPa 1232±31 1309±18 1359±11 1395±13 1400±40 1427±10 1726±3

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Min Li, Youmin Rong, Lu Wang, Jiajun Xu. Study on Microstructure and Mechanical Properties of Laser Welded Joints for Ultra-High Strength Steel 1700MS[J]. Laser & Optoelectronics Progress, 2023, 60(17): 1714004

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