Effect of Ultrasonic Frequency Pulse Current Superposition on the Microstructure and Properties of GMA Additive Manufactured High Nitrogen Steel

doi:10.12382/bgxb.2023.1097

Abstract

Abstract:

The nitrogen loss and the reduction in mechanical properties of high nitrogen steel may happen during additive manufacturing.The conventional pulsed gas metal arc(P-GMA)and P-GMA superimposed with ultrasonic frequency pulse current at the peak stage of pulse current are used to conduct the arc additive manufacturing experiments of high-nitrogen steel,and the single-pass multi-layer high nitrogen steel straight wall bodies under different processing parameters are prepared.The influence of ultrasonic frequency pulse current superposition on the solidification mode,microstructure evolution and mechanical properties of arc additive manufactured high-nitrogen steel parts were studied.Due to the nitrogen loss of arc additive manufactured high-nitrogen steel parts,the solidification mode of metal molten pool of high-nitrogen steel changes from A to FA in different arc additive manufacturing modes.Compared with the conventional P-GMA,the high-frequency ultrasonic effect generated by ultrasonic frequency pulse current can increase the diffusion of nitrogen elements,promote the austenite phase transformation,and limit the growth of ferrite dendrites.After comparative analysis,the impact of ultrasonic frequency pulse current on the Y-axis direction of ferrite dendrites is greater than that on the Z-axis direction,the impact of it on the mechanical properties in the Y-axis direction is also greater than that in the Z-axis direction.When the frequency is 60kHz,the tensile strength in the Y-axis direction is increased by 9.9%,and the yield strength is increased by 15.9%.

Key words: high nitrogen steel, arc additive manufacturing, ultrasonic frequency pulse current, microstructure evolution, mechanical property

CLC Number:

TJ444.2

MA Li, FAN Jikang, ZHANG Jian, CONG Baoqiang, YANG Dongqing, PENG Yong, WANG Kehong. Effect of Ultrasonic Frequency Pulse Current Superposition on the Microstructure and Properties of GMA Additive Manufactured High Nitrogen Steel[J]. Acta Armamentarii, 2025, 46(1): 231097-.

Figures/Tables 15

Table 1 Chemical composition of welding wire and substrate %

材料	C	Ni	Cr	Mo	Mn	Si	N	P	S	Fe
焊丝	0.028	2.08	22.7	1.19	17.86	0.18	0.99	0.015	0.01	余量
基板	0.019	1.24	20.8	3.62	17.47	0.85	0.81			余量

Fig.1 Schematic diagram of UFP-GMA additive manufacturing current waveform

Fig.2 Schematic diagram of arc additive manufactured straight wall body

Table 2 Arc additive manufacturing process parameters of high nitrogen steel

实验编号	基值电流/A	峰值电流/A	超音频脉冲电流/A	脉冲频率/ kHz
S-None	35	270
S-40	35	260	50	40
S-60	35	260	50	60
S-80	35	260	50	80

Fig.3 Sampling locationand tensile sample size

Fig.4 Conventional P-GMA additive manufactured straight wall microstructure

Fig.5 Schematic diagram of heat dissipation and crystal growth for straight wall additive manufacturing

Fig.6 Schematic diagram of austenite phase transformation at the frontier of solid-liquid interface

Fig.7 Schaeffler microstructure and solidification mode prediction for non-equilibrium solidification of stainless steel

Fig.8 Nitrogen contents of additive manufactured parts under different process parameters

Fig.9 Microstructures of additive manufactured parts under different process parameters

Fig.10 OXY dimension statistics and XRD phase analysis of additive manufactured parts

Fig.11 SEM images of microstructure on OXZ plane with different process parameters

Fig.12 Mechanical properties ofadditive manufactured parts under different process parameters

Fig.13 Tensile fracture morphologies of additive manufactured parts under different process parameters

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