Investigation on mechanical and tribological behaviour of titanium diboride reinforced martensitic stainless steel

Abstract

The role of metal matrix composites (MMCs) has gained huge momentum in various researches as well as in industrial applications due to their high stiffness and higher strength to weight ratio. It helps in achieving enormous weight reduction without compromising the strength of the material. In this study, a novel attempt was made to fabricate MMCs with martensitic stainless steel as matrix and titanium diboride (TiB 2 ) as reinforcement. The AISI 420 matrix with different weight percentages (1%, 2%, and 4%) of TiB 2 reinforcement was fabricated by vacuum induction melting technique (VIM). The aim of this study was to analyze the influence of TiB 2 particle addition on the mechanical and tribological properties of AISI 420 composites. X-ray diffraction studies revealed the presence of TiB 2 phase in the composite along with peak shifting and broadening of the steel matrix due to induced strain. Optical microscopy showed the distribution of TiB 2 particles in the matrix along with a significant amount of grain refinement of the composite due to the addition of TiB 2 . Microhardness results showed that the presence of TiB 2 improved the hardness with AISI 420/4%TiB 2 composite possessing the maximum hardness. Tensile test results indicated a significant improvement in the ultimate tensile and yield strength of the composite with the addition of TiB 2 . The wear tests were carried out on a pin on disc tribometer for various loads at a different sliding distance for steady sliding velocity. The dispersion of TiB 2 particle helped in achieving better wear resistance of the composites. Wear surface morphology was carried out to explore the wear mechanisms. Among the various wear mechanisms, abrasion and oxidation phenomena dominated in the composites. Taguchi optimization technique predicted that wt% of TiB 2 and applied load as influencing factors on the wear rate of the material.

Effect of sintering temperature on microstructure and properties of MIM420 stainless steel

“…(4) The vernier caliper with accuracy of 0.01 mm was used for dimension measurement. (5) The carbon and sulfur analyser of CS600 was used to test the carbon content, and the oxygen, chlorine and hydrogen analyser of 7CH600 was used to test the oxygen content.…”

“…As martensitic stainless steel, with high strength, good wear resistance and corrosion resistance, 420 stainless steel is commonly used for the manufacturing of cutting tools, springs, bearings, valves, injection moulds, medical appliances, etc. [1][2][3][4][5][6]. In recent years, with the improvement of atomisation technology, 420 stainless steel began to be further developed by combining with MIM technology and 3D printing technology [7][8][9][10][11][12][13].…”

Applied Research of Applicability of High-Strength Steel for a Track of a Demining Machine in Term of Its Tribological Properties

“…It is known that the wear process itself takes place in several layers, which form the surfaces of rigid bodies. According to more authors [2][3][4], physical effects during the mechanical wear process significantly affect the change of a structure as well as the change of external and internal factors (change of roughness and surface condition, heat generation and transfer, change of mechanical properties, concentration of dislocations, etc. ).…”