The Effect of Ferrous-Titanium Addition on Microstructure of TiB2+TiC Duplex Particles Reinforced Surface Composite with Carbon Steel Matrix

2013 ◽  
Vol 631-632 ◽  
pp. 476-480
Author(s):  
Chang Qin Guo ◽  
Wen Hua Han
Keyword(s):  
Carbon Steel ◽  
Uniform Distribution ◽  
Compound Layer ◽  
Steel Matrix ◽  
Surface Compound ◽  
Titanium Addition ◽  
Surface Composite

This paper presents a fabricating process and microstructural features of TiB2+TiC duplex particulates reinforced surface composite with carbon steel matrix. The effect of ferrous-titanium addition on microstructures is investigated and analyzed. The results showed that the surface compound layer do not exhibit at lower addition, but appear at higher addition. With increasing ferrous-titanium addition, the concentration and size of the synthesized particles at the surface compound layer are decreased, but the tendency of uniform distribution increased.

Fabrication & Microstructure of TiB2+TiC Duplex Particulates Reinforced Carbon Steel Matrix Surface Composite

2013 ◽  
Vol 575-576 ◽  
pp. 198-202
Author(s):  
Chang Qing Guo
Keyword(s):  
Carbon Steel ◽  
Uniform Distribution ◽  
Compound Layer ◽  
Steel Matrix ◽  
Surface Compound ◽  
Transitional Layer ◽  
Composite Matrix ◽  
Microstructural Investigation ◽  
Surface Composite ◽  
Matrix Surface

This paper presents a novel fabrication process that combines SHS with V-EPC (vacuum expandable pattern casting) and microstructural features of TiB2+TiC duplex particulates reinforced surface composite with carbon steel matrix. Macro structural observation shows that the surface composite is dense and there are no obvious defects. Microstructural investigation demonstrates that the composite from surface to core is consisted of three different layers, i.e., the top surface compound layer, the interim transitional layer and the bottom carbon steel matrix. A large amount of fine TiB2 and TiC duplex particles are evenly distributed in the composite matrix, while the concentration are significantly decreased and non-uniform distribution increased for these particles in the interim layer.

The Effect of Relative Thickness on Microstructures of TiB2/TiC Particles Reinforced Carbon Steel Matrix Surface Composite

2014 ◽  
Vol 940 ◽  
pp. 3-6
Author(s):  
Chang Qing Guo
Keyword(s):  
Carbon Steel ◽  
Low Cost ◽  
Compound Layer ◽  
Steel Matrix ◽  
Surface Compound ◽  
Relative Thickness ◽  
Surface Composite ◽  
High Temperature Synthesis ◽  
Matrix Surface ◽  
The Matrix

This paper introduces a process that combines a vacuum expandable pattern casting V-EPC with self-propagation high–temperature synthesis SHS of TiB2/TiC particles for fabricating the TiB2/TiC duplex particulates reinforced carbon steel matrix surface composite, and the effect of relative thickness δ on metallurgical quality and microstructures. FeTi-FeB-FeCr system with low cost is adopted as the SHS reactant. Experimental results show that with increasing δ, the surface composite is gradually formed and the metallurgical quality improved. The typical microstructures of the composite from surface to core are consisted of three different layers, i.e., the surface compound layer, the interim transitional layer and the carbon steel base. A certain amount of fineTiB2/TiC particles is distributed in the matrix of the surface compound layer.

Fabrication of TiB2/TiC Duplex Particles Reinforced Carbon Steel Matrix Surface Composite

2014 ◽  
Vol 1052 ◽  
pp. 40-44 ◽  
Author(s):  
Chang Qing Guo ◽  
Xiao Yan Hua ◽  
Ji Wei Han
Keyword(s):  
Carbon Steel ◽  
Compound Layer ◽  
Steel Matrix ◽  
Surface Compound ◽  
Temperature Synthesis ◽  
Composite Surface ◽  
Surface Composite ◽  
High Temperature Synthesis ◽  
Matrix Surface ◽  
Micro Structures

A process that combines a vacuum expandable pattern casting V-EPC with self-propagation high-temperature synthesis SHS of TiB2/TiC particles for the fabrication of the TiB2+TiC duplex particulates reinforced carbon steel matrix surface composite are introduced in this paper. The effect of ferrotitanium addition in the SHS reactants on the macro and micro structures as well as hardness is investigated. It has been found that with the increase of ferrotitanium addition, the concentration of synthesized particles in the layer gradually increases to maximum, then decreases. The hardness gradually decreases from the surface compound layer to core and the maximum hardness of 1682HV is obtained on the composite surface.

The Effect of Different Tungsten-Containing Materials Addition on the Reinforcements in the Surface Compound Layer with Steel Substrate

2014 ◽  
Vol 651-653 ◽  
pp. 128-132
Author(s):  
Chang Qing Guo ◽  
Xiao Ping Liu
Keyword(s):  
Carbon Steel ◽  
Optical Microscopy ◽  
Steel Substrate ◽  
Compound Layer ◽  
Experimental Results ◽  
Surface Compound ◽  
Bearing Materials

The effect of different tungsten-bearing materials addition in a surface preform, such as Ni-base WC particles, ferrotungsten powders and casting WC particles, on the reinforcement phases at the surface compound layer with a carbon steel substrate is investigated under the condition of vacuum expandable pattern casting V-EPC. The microstructures and reinforcement phases are characterized by optical microscopy, SEM and EDS. Experimental results show that it is impossible to synthesize the independent WC particles in each condition. The tungsten-containing materials are all inclined to decompose during steel infiltration and the released tungsten elements tend to combine with carbon to form fish born-like or strip-like WC or W2C carbides and dissolve in other type of carbides and matrix.

Interfacial Bonding Behavior of Stainless Steel / Carbon Steel in Cold Rolling Process

2020 ◽  
Vol 982 ◽  
pp. 121-127
Author(s):  
Shuo Li ◽  
Qing Dong Zhang
Keyword(s):  
Stainless Steel ◽  
Carbon Steel ◽  
Great Influence ◽  
Rolling Process ◽  
Interfacial Bonding ◽  
304 Stainless Steel ◽  
Nanoindentation Test ◽  
Real Contact Area ◽  
Steel Matrix ◽  
Bonding Quality

A cylindrical indenter was designed to simulate the roller and 304 stainless steel / Q235A carbon steel plate with different roughness were bonded together. The interfacial bonding behavior was investigated by SEM, ultrasonic “C” scanning detection and nanoindentation test. The result reveal that with the increase of contact pressure between interfaces, the atoms of dissimilar metals begin to diffuse across interfaces in some regions, then form island-like bonding regions, and eventually extend to the whole interface. There are no obvious cracks on the surface of stainless steel and carbon steel after deformation. The cold roll-bonding mechanism of stainless steel and carbon steel is that elements on both sides of the interface diffuse and form a shallow diffusion layer under pressure to ensure the joint strength, and the joint bonding strength is greater than the strength of carbon steel matrix. In addition, the surface morphology of base metal has a great influence on the interfacial bonding quality. The higher surface roughness values increases the hardening degree of rough peak, which makes real contact area difficult to increase and reduce the interfacial bonding quality.

Research on Distribution Regularity of Nano-Sized WC in Cast Steel

2014 ◽  
Vol 668-669 ◽  
pp. 52-55
Author(s):  
Yang Han ◽  
Ai Ling Zhang ◽  
Lin Yang ◽  
Ya Ling Han
Keyword(s):  
Wear Resistance ◽  
Uniform Distribution ◽  
Cast Steel ◽  
Experimental Results ◽  
Steel Matrix ◽  
Gravity Segregation ◽  
Resistance Alloy ◽  
Segregation Phenomenon

The microstructure of 40CrNi2Mo steel matrix strengthened with wear resistance alloy is observed by the optical scope, SEM with EDS and FESEM. Analysis emphasis is lied on the distribution regulation of nanosized WC particulates in the microstructure of the steel matrix. Experimental results show that the method of adding wear resistance alloy in steel matrix can avoid gravity segregation phenomenon effectively and guarantee a uniform distribution of WC in steel matrix. nanosized WC particulates distributing evenly in steel matrix improve the wear resistance, and make microstructure of the steel matrix more uniform, finer and denser proved by its high-expansion micrograph.

Properties and fracture splitting of cast steel matrix composites

2019 ◽  
Vol 43 (2) ◽  
pp. 164-172 ◽  
Author(s):  
Yinfang Jiang ◽  
Deli Sha ◽  
Kewei Wang ◽  
Junkang Qian
Keyword(s):  
Carbon Steel ◽  
Cleavage Fracture ◽  
Cast Steel ◽  
Steel Matrix ◽  
Performance Tests ◽  
Matrix Composites ◽  
Preheating Temperature ◽  
Fracture Splitting ◽  
Bimetallic Sample

To break through current limitations of fracture splitting materials for connecting rods, a bimetallic compound as a fracture splitting material was studied. The bimetallic sample was produced by investment casting, and interface performance tests and splitting tests were conducted. At a casting temperature of 1600 °C for 0.25 wt. % C cast carbon steel, the preheating temperature of T10A was 500 °C, and the thickness of T10A was in the range of 2–3 mm. The 0.25 wt. % C cast carbon steel and T10A were fully combined in the interface. The appearance of the fracture zone was a flat cleavage fracture, which would facilitate meshing of the cracked surface if the specimen were assembled and improve the quality of fracture splitting.

SEGREGATION IN MULTICOMPONENT ALLOYS: ORDERED CrN AND CrC SURFACE PHASES ON A Fe-15%Cr-C, N(100) SINGLE CRYSTAL

1996 ◽  
Vol 03 (05n06) ◽  
pp. 1721-1731 ◽  
Author(s):  
C. UEBING ◽  
V. SCHEUCH ◽  
M. KISKINOVA ◽  
H. P. BONZEL
Keyword(s):  
Single Crystal ◽  
Bulk Composition ◽  
Polar Angle ◽  
Compound Layer ◽  
Single Scattering ◽  
Forward Scattering ◽  
Surface Compound ◽  
Bcc Lattice ◽  
Rocksalt Structure ◽  
Surface Phases

In general the chemical composition of multicomponent alloy surfaces exhibits significant deviations from the bulk composition due to thermally activated segregation processes. Upon cosegregation epitaxially stabilized two-dimensional surface compounds are formed on substrate surfaces of suitable orientation, e.g. CrN on Fe-15%Cr-N(100) and CrC on Fe-15%Cr-C(100) . The important role of the epitaxial stabilization manifests itself by the fact that on Fe-15%Cr-C(100) crystals the formation of cubic CrC surface precipitates is possible upon nonequilibrium cosegregation of the constituent components. Such a chromium carbide with rocksalt structure is not stable in the bulk of bcc Fe-Cr-C alloys . Angle-resolved photoemission of Cr 2 p 3/2, N 1s and C 1s core level photoelectrons is used to determine the structure of the CrN surface compound and of the CrC surface precipitate on a Fe-15%Cr-C,N(100) single crystal. Both surface phases exhibit a sharp 1×1 LEED pattern. Polar angle intensity distributions of photoelectrons (x-ray photoelectron diffraction) are recorded in the [001] and [011] azimuths, respectively. For CrN the angular intensity distributions exhibit forward scattering peaks for Cr 2 p 3/2 but not for N 1s. Most likely, the CrN phase consists of a CrN compound layer with significant N outward relaxation of about 0.6 Å and a second completed Cr layer. Single scattering cluster (SSC) calculations indicate that the Cr-Cr interlayer distance is expanded by about 26% with respect to the bcc lattice. For CrC , on the other hand, Cr 2 p 3/2 and C 1s show both strong forward scattering features in all distributions. The CrC phase consists of at least three complete compound layers with NaCl structure.

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