强化改性研磨时间对12Cr17Mn6Ni5N钢表层特性及拉伸性能的影响

何鹏; 谢鑫成; 陈嘉懿; 张宇鹏; 邹涛; 萧金瑞; 梁忠伟

HE Peng,XIE Xincheng,CHEN Jiayi,ZHANG Yupeng,ZOU Tao,XIAO Jinrui,LIANG Zhongwei.#$NPEffect of Strengthening Grinding Time on Surface Layer Properties and Tensile Properties of 12Cr17Mn6Ni5N Steel[J],53(15):173-183, 233

#$NPEffect of Strengthening Grinding Time on Surface Layer Properties and Tensile Properties of 12Cr17Mn6Ni5N Steel

Received:July 04, 2023 Revised:November 30, 2023

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DOI：10.16490/j.cnki.issn.1001-3660.2024.15.016

KeyWord:strengthening grinding 12Cr17Mn6Ni5N surface layer properties tensile properties

Author	Institution
HE Peng	School of Mechanical and Electrical Engineering,Guangzhou Key Laboratory for Strengthened Grinding and High Performance Machining of Metal Material, c.Guangdong Engineering Research Centre for Strengthen Grinding and Micro/Nano High-performance Machining, Guangzhou University, Guangzhou , China
XIE Xincheng	School of Mechanical and Electrical Engineering,Guangzhou Key Laboratory for Strengthened Grinding and High Performance Machining of Metal Material, c.Guangdong Engineering Research Centre for Strengthen Grinding and Micro/Nano High-performance Machining, Guangzhou University, Guangzhou , China
CHEN Jiayi	School of Mechanical and Electrical Engineering,Guangzhou Key Laboratory for Strengthened Grinding and High Performance Machining of Metal Material, c.Guangdong Engineering Research Centre for Strengthen Grinding and Micro/Nano High-performance Machining, Guangzhou University, Guangzhou , China
ZHANG Yupeng	China-Ukraine Institute of Welding, Guangdong Academy of Sciences, Guangzhou , China
ZOU Tao	School of Mechanical and Electrical Engineering,Guangzhou Key Laboratory for Strengthened Grinding and High Performance Machining of Metal Material, c.Guangdong Engineering Research Centre for Strengthen Grinding and Micro/Nano High-performance Machining, Guangzhou University, Guangzhou , China
XIAO Jinrui	School of Mechanical and Electrical Engineering,Guangzhou Key Laboratory for Strengthened Grinding and High Performance Machining of Metal Material, c.Guangdong Engineering Research Centre for Strengthen Grinding and Micro/Nano High-performance Machining, Guangzhou University, Guangzhou , China
LIANG Zhongwei	School of Mechanical and Electrical Engineering,Guangzhou Key Laboratory for Strengthened Grinding and High Performance Machining of Metal Material, c.Guangdong Engineering Research Centre for Strengthen Grinding and Micro/Nano High-performance Machining, Guangzhou University, Guangzhou , China

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Abstract:

To improve the surface properties and tensile properties of 12Cr17Mn6Ni5N steel welds, the single variable method was used to control the processing time of strengthening grinding, and the surface of 12Cr17Mn6Ni5N steel was subject to strengthening grinding at processing times of 1 min, 2 min, and 3 min, respectively. Under the same loading conditions, tensile experiments were carried out on an electronic universal mechanical testing machine at a room temperature of 24-26 ℃. The stress-strain curves of each sample were plotted, and the fracture morphology near the depths of 30 μm, 100 μm, and 170 μm from the surface was photographed by scanning electron microscopy. In the first step, the roughness of each sample was measured in the tensile direction and along the weld seam direction with a roughness profiler, followed by the micro- morphology of the surface with a scanning electron microscope and the 3D morphology of the surface with a three-dimensional measurement microscope. The micro-hardness of each sample was measured with a micro-hardness tester for the micro-micro- hardness of each sample in different depths and the residual stress was measured with a residual stress tester. Secondly, the hardness of each sample was measured with a microhardness tester, the residual stress on the surface was measured with a residual stress tester, and then the surface organization of each sample was measured with an optical metallographic microscope. After the room temperature tensile test, the fracture morphology of the tensile samples was photographed with a scanning electron microscope. Compared with the base material, when the processing time increased from 1 min to 3 min, the more the surface microstructure of 12Cr17Mn6Ni5N steel, the surface roughness in the direction of tensile and along the weld increased to Ra=1.81 μm, Ra=1.46 μm. The height difference of the three-dimensional morphology increased to 34.82 μm and then decreased to 31.75 μm, and the microhardness of the surface layer was increased by up to 104.60 percent. The residual stress was increased to −1 221.3 MPa, and the maximum thickness of the reinforced layer was 160 μm. Under the same loading conditions, the yield strength and tensile strength of the samples with a processing time of 3 min were increased by 15.89% and 10.17%, respectively. Near the depth of 30 μm, the fracture morphology of the sample with a processing time of 3 min showed a small number of tough nests. The other samples were brittle fractures, in which the parent sample was fully dissociated brittle fracture; Near the depth of 100 μm, the parent sample was still brittle fracture. The samples with processing time of 1 min and 2 min were mixed fracture. And the sample with processing time of 3 min was ductile fracture and showed deeper large tough nests and deep tough nests. In conclusion, strengthening grinding process can effectively improve the laser welded 12Cr17Mn6Ni5N steel surface characteristics. With the increase of processing time, the more the laser welded 12Cr17Mn6Ni5N surface microstructure, the higher the surface roughness. The three-dimensional morphology height difference first increased and then decreased. The higher the hardness and residual stress, the thicker the organization of the dense reinforced layer. Strengthening grinding method effectively improves the tensile strength and yield strength of the laser welded 12Cr17Mn6Ni5N steel. And the longer the processing time within a certain range, the more obvious the enhancement effect, but the elongation decreased.