The Effect of Intensity Pulsed Ion Beam Irradiation on Wear Resistance of High-speed Steel
来源期刊：材料热处理学报2004年第5期
论文作者：MA Teng-cai LIU Zhen-min WANG Ying-min HAO Sheng-zhi MEI Xian-xiu
关键词：Intensity Pulsed Ion Beam (IPIB); high-speed steel (HSS); Wear resistance;
摘 要：The structural and phase transformations occurring in the near-surface layers of pre-quenched W6Mo5Cr4V2high-speed steel (HSS) subjected to intensity pulsed ion beam (IPIB) melting have been investigated. The effect of IPIB high beam current density of 80A/cm2, acceleration voltage of 250kV, pulse duration of 70 ns. Samples were bombarded with 1, 3, 5 pulses respectively. It has been revealed that after IPIB irradiation the initial martensite in the near-surface layer of HSS changed into austenite and produced residual stresses by using electron microscopy and X-ray diffraction.Redistribution and interlace of dislocations in the irradiated samples were generated under the impact of shock wave. With increasing pulse times gradual liquid-phase dissolution of M6C carbide particles occurs in the near-surface layer and produces nanocrystalline MC. This process results in the decrease of martensite crystal (α-phase) and increase of austenite (γ-phase) content and the dispersed carbide. Wear resistance of the HSS is improved by a factor of 2, which is explained by the formation of metastable phases such nanocrystal and residual stresses and the redistribution and interlace of dislocations.
MA Teng-cai1，LIU Zhen-min1，WANG Ying-min1，HAO Sheng-zhi1，MEI Xian-xiu1
(1.State Key Laboratory for Materials Modification by Laser, Ion and Electron Beams, Department of Physics, Dalian University of Technology, Dalian 116024, China)
摘要:The structural and phase transformations occurring in the near-surface layers of pre-quenched W6Mo5Cr4V2high-speed steel (HSS) subjected to intensity pulsed ion beam (IPIB) melting have been investigated. The effect of IPIB high beam current density of 80A/cm2, acceleration voltage of 250kV, pulse duration of 70 ns. Samples were bombarded with 1, 3, 5 pulses respectively. It has been revealed that after IPIB irradiation the initial martensite in the near-surface layer of HSS changed into austenite and produced residual stresses by using electron microscopy and X-ray diffraction.Redistribution and interlace of dislocations in the irradiated samples were generated under the impact of shock wave. With increasing pulse times gradual liquid-phase dissolution of M6C carbide particles occurs in the near-surface layer and produces nanocrystalline MC. This process results in the decrease of martensite crystal (α-phase) and increase of austenite (γ-phase) content and the dispersed carbide. Wear resistance of the HSS is improved by a factor of 2, which is explained by the formation of metastable phases such nanocrystal and residual stresses and the redistribution and interlace of dislocations.
关键词:Intensity Pulsed Ion Beam (IPIB); high-speed steel (HSS); Wear resistance;
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