Effect of Electrolytic-Plasma Carbonitriding on Structure and Microhardness of Low Carbon Steel 18CrNi3Mo

2013 ◽  
Vol 379 ◽  
pp. 101-104
Author(s):  
Mazhyn Skakov ◽  
Lyaila Bayatanova ◽  
Michael Sсheffler
Keyword(s):  
Carbon Steel ◽  
Structure Formation ◽  
Layer Structure ◽  
Low Carbon Steel ◽  
Steel Sample ◽  
Strength Properties ◽  
Low Carbon ◽  
Gradient Layer ◽  
Modified Layer

In this paper modified gradient layer was under research, the resulting electrolytic-plasma carbonitriding of low carbon steel 18CrNi3Mo surface was investigated. Aiming to improve the structure and strength properties of the layer, the possibility of application have been shown. Plasma carbonitriding optimized mode is presented as well. Regime of electrolyte plasma carbonitriding which consists in heating the steel sample to 8500C with aggregate exposure at this temperature for 3-7 min. and quenching in cold electrolyte has been optimized. We studied the processes of modified layer structure formation under different conditions

Improvement of Low Carbon Steel Properties through V-N Microalloying

2005 ◽  
Vol 500-501 ◽  
pp. 503-510 ◽  
Author(s):  
Ibrahim Hamed M. Ali ◽  
Ibrahim M. Moustafa ◽  
Ahmed Mohamed Farid ◽  
R.J. Glodowski
Keyword(s):  
Mechanical Properties ◽  
Carbon Steel ◽  
Nitrogen Content ◽  
Low Carbon Steel ◽  
Nitrogen Addition ◽  
Strength Properties ◽  
Vanadium Content ◽  
Low Carbon ◽  
Steel Properties ◽  
Low Solubility

To improve the strength properties of vanadium bearing low carbon steel, nitrogen is often added to the liquid steel. The source of the nitrogen addition can be in many different forms. The recovery of nitrogen from the addition is variable due to the low solubility of nitrogen in steel. In this work, nitrogen-enriched alloy (Nitrovan) was added under open atmosphere. To deduce the nitrogen role, two alloys were chosen that having the same vanadium content. One of them was Ferro-Vanadium as a source of vanadium, whereas Nitro-Vanadium used as a source of vanadium and nitrogen. Ferro-vanadium as well as Nitro-vanadium was added separately in the ladle after completely melting of carbon steel and proper superheat using 100 Kg induction furnace. The effect of adding nitrogen-enriched alloy on mechanical properties of the steel was investigated. For this purpose, four heats were produced and cast into sand moulds. The general trend of results shows higher mechanical properties through increasing nitrogen content. The experimental work indicates that enhanced nitrogen content promotes the precipitation of V(C,N) and decreases the particles size of V(C,N) precipitates. Also, under the same level of vanadium content, the tensile strength and yield strength of the nitrogen-enhanced steels increases consistently compared to the steels added 80% Ferro-Vanadium. An empirical formula, correlating the mechanical properties of the steel and its composition, was obtained.

Precipitation of NbC and Effect of Mn on the Strength Properties of Hot Strip HSLA Low Carbon Steel

1998 ◽  
Vol 284-286 ◽  
pp. 311-318 ◽  
Author(s):  
V. Thillou ◽  
M. Hua ◽  
C. Isaac Garcia ◽  
C. Perdrix ◽  
Anthony J. DeArdo
Keyword(s):  
Carbon Steel ◽  
Low Carbon Steel ◽  
Strength Properties ◽  
Low Carbon ◽  
Hot Strip

Effect of Alloying Elements on the Corrosion Behavior of Carbon Steel in CO2 Environments

CORROSION ◽  
10.5006/2705 ◽  
2018 ◽  
Vol 74 (5) ◽  
pp. 566-576 ◽  
Author(s):  
Yoon-Seok Choi ◽  
Srdjan Nešić ◽  
Hwan-Gyo Jung
Keyword(s):  
Carbon Steel ◽  
Corrosion Rate ◽  
Corrosion Behavior ◽  
Low Carbon Steel ◽  
Steel Sample ◽  
Alloying Elements ◽  
Low Carbon ◽  
Surface Analysis Techniques ◽  
Positive Effect ◽  
Effect Of Alloying

The objective of the present study was to evaluate the effect of alloying elements (Cr, Mo, and Cu) on the corrosion behavior of low carbon steel in CO2 environments. Six samples were prepared with varying Cr content from 0 wt% to 2 wt% and with added 0.5 wt% of Mo and Cu; the specimens had ferritic/pearlitic microstructures. Steel samples were exposed to a CO2-saturated 1 wt% NaCl solution with different combinations of pH and temperature (pH 4.0 at 25°C, pH 6.6 at 80°C, and pH 5.9 at 70°C). Changes in corrosion rate with time were determined by linear polarization resistance measurements. The surface morphology and the composition of the corrosion product layers were analyzed by surface analysis techniques (scanning electron microscopy and energy dispersive x-ray spectroscopy). Results showed that the presence of Cr and Cu showed a slight positive effect on the corrosion resistance at pH 4.0 and 25°C. At pH 6.6 and 80°C, regardless of the alloying elements, the trend of corrosion rate with time was similar, i.e., the corrosion rate of all specimens decreased with time resulting from the formation of protective FeCO3. A beneficial effect of Cr presence was clearly seen at “gray zone” conditions: pH 5.9 and 70°C, where steel sample without Cr showed no decrease in corrosion rate with time. The presence of Cr in the steel promoted the formation of protective FeCO3 with Cr enrichment and it decreased the corrosion rate.

scholarly journals Bonding of Si chips to low carbon steel boards using electroplated Sn solder

2018 ◽  
Vol 30 (4) ◽  
pp. 213-216
Author(s):  
Shou-Jen Hsu ◽  
Chin C. Lee
Keyword(s):  
Carbon Steel ◽  
Cross Sections ◽  
Coefficient Of Thermal Expansion ◽  
Layer Structure ◽  
Low Carbon Steel ◽  
Bonding Process ◽  
Low Carbon ◽  
Content Type ◽  
The Military ◽  
Steel Substrates

Purpose The purpose of this research was to develop a new process to bond silicon (Si) chips to low carbon steel substrates using pure tin (Sn) without any flux. Design/methodology/approach Iron (Fe) substrates were first electroplated with a Sn layer, followed by a thin silver (Ag) layer that inhibits Sn oxidation thereafter. It is this Ag capping layer that makes the fluxless feature possible. Fluxless processes are more environmentally friendly and more likely to produce joints without voids. The Si chips were deposited with Cr/Au dual layer structure. The bonding process was performed at 240°C in vacuum. The Sn joint thickness was controlled by spacers during the bonding. Scanning electron microscopy images on cross sections exhibited quality joints without visible voids. Energy dispersive X-ray spectroscopy analysis was used to detect joint compositions. Findings It was revealed that the Sn layer was bonded to a Si chip at the Cr–Sn interface and to the Fe substrate by forming an FeSn2 intermetallic compound (IMC). The IMC is only 1.1 to 1.5 µm in thickness. Thin IMC is highly preferred because IMC deforms a little in accommodating the coefficient of thermal expansion (CTE) mismatch between Si and Fe. Shear test results showed that the fracture forces of the samples passed the military criteria by a wide margin. Originality/value This new fluxless bonding process on Fe should make Fe or low carbon steel a more likely choice of materials in optical modules and electronic packages.

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