Valentin Mishev
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View article: Deposition and Properties of Nanostructured Multilayer Cr/(Cr/a-C)ml Coating on Stainless Steels
Deposition and Properties of Nanostructured Multilayer Cr/(Cr/a-C)ml Coating on Stainless Steels Open
This work presents the results of deposition by magnetron sputtering nanostructured multilayer Cr/(Cr/a-C)ml coatings on AISI 316L and AISI 321 steel substrates. Chemical compositions were confirmed through EDX analysis with scanning elect…
View article: Deposition of Multilayer Nanostructured Coating Cr/(Cr/a-C)ml on Alloy Steels
Deposition of Multilayer Nanostructured Coating Cr/(Cr/a-C)ml on Alloy Steels Open
A chromium/amorphous carbon (Cr/(Cr/a-C)ml) nanostructured multilayer coating with a chromium sublayer was deposited on 42CrMo4 (1.7225,BDS EN ISO 683-2:2018), 100Cr6 (1.3505, BDS EN ISO 683-17:2024), and HS18-0-1 (1.3355, BDS EN ISO 4957:…
View article: INVESTIGATION ON PHASE COMPOSITION AND MICROSTRUCTURE OF HIGH CHROMIUM WHITE CAST IRONS ALLOYED WITH BORON
INVESTIGATION ON PHASE COMPOSITION AND MICROSTRUCTURE OF HIGH CHROMIUM WHITE CAST IRONS ALLOYED WITH BORON Open
The microstructure and phase composition of high chromium white cast iron with composition: 2.6÷3.1%C; 0.88÷1.12%Si; 0.74÷0.98% Mn; 0.85÷1.16% Mo; 11.11÷14.11% Cr, additionally doped with boron in an amount 0.002%, 0.92% and 1.34% is inves…
View article: EFFECT OF BORON ON THE WEAR BEHAVIOR OF HIGH CHROMIUM WHITE CAST IRONS
EFFECT OF BORON ON THE WEAR BEHAVIOR OF HIGH CHROMIUM WHITE CAST IRONS Open
The wear behavior of high chromium white cast irons with composition: 2,6÷3,4% C; 0,9÷1,1% Si; 0,8÷1,1% Mn; 1,0÷1,3% Mo; 12,3÷13,4% Cr and 0,18 ÷ 1,25% B is investigated. The microstructure and tribological characteristics of six compositi…
View article: MICROSTRUCTURE AND PROPERTIES OF HIGH CHROMIUM WHITE CAST IRONS ALLOYED WITH BORON
MICROSTRUCTURE AND PROPERTIES OF HIGH CHROMIUM WHITE CAST IRONS ALLOYED WITH BORON Open
The microstructure and mechanical properties of high chromium white cast iron with composition: 2,6÷3,4% C; 0,9÷1,1% Si; 0,8÷1,1% Mn; 1,0÷1,3% Mo; 12,3÷13,4% Cr, additionally doped with boron in an amount of 0,18% to 1,25% is investigated.…
View article: Bainitic Transformation in High-Speed Steels
Bainitic Transformation in High-Speed Steels Open
The investigation on the structure formation in the bainitic area for high-speed steel HS18-0-1 is performed.The austempering is carried out at 270 °С after austenitizing at 1280 °С following by isothermal retention in the area of high res…
View article: Effect of nanosized particles on the bainitic transformation in austempered ductile irons
Effect of nanosized particles on the bainitic transformation in austempered ductile irons Open
The austempered ductile iron was austenitized at 900°C for 1 h and quenched in an isothermal quenching furnace at 380 °C, 0,5 h, 1 h, 2 h, 4 h, 6 h. This paper aims to investigate the effects of nanosized particles (50nm) of titanium carbi…
View article: Microstructure and Tribological Properties of Spheroidal Graphite Cast Irons with Nanoadditives
Microstructure and Tribological Properties of Spheroidal Graphite Cast Irons with Nanoadditives Open
In this paper metallographic, mechanical and tribological tests of spheroidal graphite cast iron with applied nanosized additives of titanium nitride + titanium carbonitride (TiN + TiCN), titanium nitride TiN and cubic boron nitride cBN ar…
View article: INVESTIGATION ON TRIBOLOGICAL BEHAVIOR OF DUCTILE CAST IRONS WITH NANOSIZED PARTICLES
INVESTIGATION ON TRIBOLOGICAL BEHAVIOR OF DUCTILE CAST IRONS WITH NANOSIZED PARTICLES Open
The work in this study is focused on investigation of the tribological behavior of ductile cast iron with nanosized particles: titanium nitride TiN; titanium nitride 30% + titanium carbonitride 70% (30%TiN+70%TiCN). The ductile cast iron c…
View article: TRIBOLOGICAL PROPERTIES AND MICROSTRUCTURE OF ELECTROLESS NICKEL COATINGS REINFORCED WITH NANOPARTICLES
TRIBOLOGICAL PROPERTIES AND MICROSTRUCTURE OF ELECTROLESS NICKEL COATINGS REINFORCED WITH NANOPARTICLES Open
Composite nickel coatings composed of Ni; Ni + TiN are studied. The method for elecrtroless nickel deposition EFFTOM-NICKEL with TiN nanosized strengthening particles (50nm) is applied. The coatings are deposited on austempered ductile iro…
View article: Bainitic Transformation in High-Speed Steels
Bainitic Transformation in High-Speed Steels Open
The investigation on the structure formation in the bainitic area for high-speed steel HS18-0-1 is performed. The austempering is carried out at 270 °С after austenitizing at 1280 °С following by isothermal retention in the area of high re…
View article: Wear Resistance of Austempered Ductile Iron with Nanosized Additives
Wear Resistance of Austempered Ductile Iron with Nanosized Additives Open
The wear resistance, microstructure and mechanical properties of austempered ductile iron (ADI) with nanosized additives of cubic boron nitride cBN are investigated. Samples of ductile iron are put under austhempering at the following cond…
View article: Enhancement in the Tribological and Mechanical Properties of Electroless Nickel-Nanodiamond Coatings Plated on Iron
Enhancement in the Tribological and Mechanical Properties of Electroless Nickel-Nanodiamond Coatings Plated on Iron Open
A technology to improve the tribological and mechanical surface properties of iron alloys is developed based on the electroless nickel plating.The technology combines sol-gel and electroless deposition technique.Novel nanocomposite coating…
View article: Enhancement in the Tribological and Mechanical Properties of Electroless Nickel-Nanodiamond Coatings Plated on Iron
Enhancement in the Tribological and Mechanical Properties of Electroless Nickel-Nanodiamond Coatings Plated on Iron Open
A technology to improve the tribological and mechanical surface properties of iron alloys is developed based on the electroless nickel plating. The technology combines sol-gel and electroless deposition technique. Novel nanocomposite coati…
View article: Effect of Nanoadditives on the Wear Behavior of Spheroidal Graphite Cast Irons
Effect of Nanoadditives on the Wear Behavior of Spheroidal Graphite Cast Irons Open
The tribological characteristics of spheroidal graphite cast irons with and without nanosized additives are investigated. The tests are performed as in cast iron condition as well after austempering. The spheroidal graphite irons are under…
View article: STRUCTURE AND MECHANICAL PROPERTIES OF SPHEROIDAL GRAPHITE CAST IRON WITH NANOSIZED ADDITIVES
STRUCTURE AND MECHANICAL PROPERTIES OF SPHEROIDAL GRAPHITE CAST IRON WITH NANOSIZED ADDITIVES Open
The microstructure and properties of spheroidal graphite cast irons and austempered ductile irons with nanosized additives of titanium carbonitride and titanium nitride (TiCN+TiN), titanium nitride TiN and cubic boron nitride cBN are inves…