Microstructure and Mechanical Properties of Laser Butt Welded 301L Cold-rolled Plates of Different Strength

doi:10.11901/1005.3093.2019.476

Chinese Journal of Materials Research

2020, Vol. 34

Issue (7): 505-510 DOI: 10.11901/1005.3093.2019.476

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Microstructure and Mechanical Properties of Laser Butt Welded 301L Cold-rolled Plates of Different Strength

FAN Jiafei¹, LIU Wei¹(

), GUO Xiangzhong¹, LI Xiqing¹, HU Liguo²

1.School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China
2.CRRC Chang Chun Railway Vehicles Co. Ltd. , Changchun 130062, China

Cite this article:

FAN Jiafei, LIU Wei, GUO Xiangzhong, LI Xiqing, HU Liguo. Microstructure and Mechanical Properties of Laser Butt Welded 301L Cold-rolled Plates of Different Strength. Chinese Journal of Materials Research, 2020, 34(7): 505-510.

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Abstract

The microstructure and tensile properties of laser butt welding joints for cold-rolled plates of metastable austenitic stainless steel with four grades of strength were investigated, namely 301L-DLT, 301L-ST, 301L-MT and 301L-HT. The laser molten pool solidifies as primary ferrites and the formed weld bead presents low thermal cracking susceptibility, which is composed of columnar grains that grew vertically inward from the fusion boundary, but a central equiaxed grain region is absent. Microstructure of the weld seam consists of austenite and lathy, skeleton- and vermicular-ferrite, while no impurities, hot cracking and precipitates were detected. The average spacing of the primary ferrite dendritic arms is approximately 17.5 μm, and the average ferrite amount is 5.7% (volume fraction). The hardness of weld seam is 208~241HV, which is lower than the hardness of 301L-ST, 301L-MT and 301L-HT plates. The tensile fracture of laser weld joints of 301L-DLT and 301L-ST occurs within the base metal, and that of 301L-MT and 301L-HT takes place in the weld seam, correspondingly their fracture strength is 886 MPa and 921 MPa respectively. Except for the lower plasticity of the 301L-HT weld joint, the tensile properties of weld joint of the other three steels all meet the requirements of mechanical properties in JIS G 4305 standard for the cold-rolled 301L plates of the relevant strength grade.

Key words: metallic materials cold-rolled 301L plates laser butt weld solidification microstructure mechanical property

Received: 15 October 2019

ZTFLH:

TG457.1

Fund: Scientific Research and Development Projects of China Railways Corporation(2017J011-C)

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	Jiafei FAN
	Wei LIU
	Xiangzhong GUO
	Xiqing LI
	Liguo HU

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.476 OR https://www.cjmr.org/EN/Y2020/V34/I7/505

Table 1 Chemical compositions of 301L plate (mass fraction, %)

Table 2 Mechanical properties of 301L plates

Fig.1 Dimensions of laser welded tensile specimen

Fig.2 Microstructure of laser butt welded joint (a) overall view of welded joint; (b) optical micrograph of upper weld; (c) optical micrograph of weld bottom; (d) SEM micrograph of middle weld center; (e) lathy ferrite bunch in SEM micrograph; (f) SEM micrograph of bottom weld center

Fig.3 Microhardness profiles of laser welded 301L cold-rolled plates with different strengths

Fig.4 Tensile curves of laser welded 301L cold-rolled plates with different strengths

Fig.5 Tensile fracture positions of laser butt welded 301L cold-rolled plates with four grade strengths (a) 301L-DLT, (b) 301L-ST, (c) 301L-MT, (d) 301L-HT

Fig.6 Fracture morphologies of upper laser weld (a), bottom laser weld (b) and 301L-DLT plate (c)

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