NDLI: Experimental study of microstructure, mechanical and tribological properties of cBN particulates SS316 alloy based MMCs fabricated by DMLS technique

Content Provider	Springer Nature Link
Author	Hussain, M. Mandal, V. Singh, P. K. Kumar, P. Kumar, V. Das, A. K.
Copyright Year	2017
Abstract	Direct metal laser sintering process (DMLS) was chosen to develop cBN particulates reinforced SS316 based Metal matrix composite (MMC) with 5 %, 7.5 % and 10 % cBN in the nitrogen gas atmosphere using continuous wave fibre laser of 400 W output capacity. Effects of process parameters such as laser power, beam scanning speed and the mixing ratio of powder on different physical properties of the developed MMC were investigated. It was found that the physical and mechanical properties such as friction and wear behavior, micro hardness and density come up with improved results. FESEM images indicate the microstructure of the composite and evidently confirms the presence of cubic boron nitride in the SS316 matrix where chromium nitride acted as a binder in the presence of nitrogen atmosphere. The Vickers hardness values of the developed MMCs with laser power 60 W and 65 W were found in the range of 276-478 HV$_{0.2}$ and 297-460 HV$_{0.2}$, respectively. It was found that Vickers hardness is directly proportional to the % of cBN in the powder mixture and the laser beam power. The wear resistance of the sintered MMCs increased with increasing cBN content in powder mixture and results show that wear of MMCs are much lower than that of SS316. X-Ray diffraction (XRD) analysis of the fabricated MMC confirms the presence of different phases such as cBN, CrN, CrB$_{2}$, Cr$_{2}$N and Fe$_{3}$N as a consequence of a series of chemical reaction between cBN and different elements of SS316 in nitrogen atmosphere.
Starting Page	2729
Ending Page	2737
Page Count	9
File Format	PDF
ISSN	1738494X
Journal	Journal of Mechanical Science and Technology
Volume Number	31
Issue Number	6
e-ISSN	19763824
Language	English
Publisher	Korean Society of Steel Construction
Publisher Date	2017-07-25
Publisher Place	Seoul
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	cBN DMLS Microhardness MMC Porosity Mechanical Engineering Vibration, Dynamical Systems, Control Industrial and Production Engineering
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Mechanical Engineering

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