Powder Metallurgical Solution for a Complex Geometry Coupler Requiring High Dimensional Stability and Microstructural Uniformity through Heat Treatment

2021 ◽  
Author(s):  
Craig Stringer ◽  
Andy Wright ◽  
Pete Imbrogno
Keyword(s):  
Heat Treatment ◽  
Carbon Steel ◽  
Dimensional Stability ◽  
Complex Geometry ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Metal Powders ◽  
Machining Processes ◽  
Premature Failure ◽  
Processing Optimization

Abstract Powder metallurgy (PM) is the fabrication process of compacting metal powders to shape and sintering these compacts to yield the final material’s properties. The PM compaction process allows for complex geometries to be formed that would normally lead to long and expensive machining processes from wrought steels. Special alloy selection can allow for hardening of the microstructure during the sintering procedure. The sinter hardened (SH) alloys exhibit good mechanical properties along with good hardenability and dimensional stability and may be a suitable replacement for wrought steels where low distortion from heat treatment or microstructural control is required. In this study, it was found for a complex geometry coupler application, a SH alloy could successfully replace an austenitizing heat treatment process with a low carbon steel. The low carbon steel was found to have micro heterogeneities from heat treatment that lead to premature failure in the application. Dimensional distortion and production variance were also of concern with the low carbon steel. The SH material demonstrated acceptable physical properties, hardness and microstructural uniformity to solve the concerns associated with processing of the low carbon steel coupler. Post processing optimization also added to the life performance of the coupler by tailoring the final microstructure to mating components.

Experimental study of the mechanical and corrosion properties of ethyl silicate resin applied on low carbon steel

2021 ◽  
Vol 2 (108) ◽  
pp. 68-74
Author(s):  
M. Ali ◽  
J.H. Mohmmed ◽  
A.A. Zainulabdeen
Keyword(s):  
Heat Treatment ◽  
Carbon Steel ◽  
Open Circuit Potential ◽  
Low Carbon Steel ◽  
Open Circuit ◽  
Treatment Temperature ◽  
Ethyl Silicate ◽  
Low Carbon ◽  
Corrosion Properties ◽  
Mixture Ratio

Purpose: This work aimed at evaluating the properties of the ethyl silicate-based coating that can be applied on low carbon steel. Design/methodology/approach: Two mixture ratio types (2:1, and 3:2) of resin and hardener respectively were used to prepared two specimen models (A and B). Findings: It found that some mechanical properties (tensile, hardness, and impact strength) of ethyl silicate resin were evaluated according to standard criteria. Research limitations/implications: The effect of heat treatments at various temperatures (100, 150, and 200°C) and holding at different times (10, 20 & 30) min on hardness was investigated. Practical implications: Moreover, an open circuit potential corrosion test with a solution of 3.5% Sodium Chloride at room temperature and 60°C was used to determine the corrosion resistance of low carbon steel specimens coated with the two mixture types. Originality/value: The effects of mixture ratios (for resin and hardener) and heat treatment conditions on properties of ethyl silicate-based coating were studied. From obtained results, acceptable values of tensile, hardness, and toughness were recorded. Increasing heat treatment temperature and holding time leads to enhance hardness for both model types. An open circuit potential (OCP) tests show that there is an enhancement of protective properties of ethyl silicate coatings with mixture type B in comparison with type A was achieved. Generally, the results indicate that specimen model B has higher properties as compared with specimen model A.

Cold extrusion of conical cups with cylindrical cavity

2016 ◽  
Vol 1 (1) ◽  
pp. 8-14 ◽  
Author(s):  
Н. Коробова ◽  
N. Korobova ◽  
А. Дмитриев ◽  
A. Dmitriev ◽  
Н. Толмачев ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Mathematical Model ◽  
Carbon Steel ◽  
Low Carbon Steel ◽  
Cold Extrusion ◽  
Extrusion Force ◽  
Low Carbon ◽  
Cylindrical Punch ◽  
The Mathematical Model

The method and results of the study of reverse extrusion of billet by cylindrical punch in a conical expanding matrix are described. The mathematical model, which we developed for the determination of specific extrusion force, is described too. The study by statistical method verified the adequacy of the model. This model made possible to assess the resistance of punches and showed the ability to produce deformation of a billet made of low carbon steel without heating. The developed process includes the operation of segmenting of the cylindrical workpieces from bar, heat treatment, lubrication and extrusion of the workpieces. The two-way cold extrusion of a billet is produced in a matrix alternatively by two punches. The design of the stamp is described. The stamp is specialized for reverse extrusion of a billet. In its construction the moving mechanism of action of the two alternately punches in one matrix is used.

Heat Treatment Conditions of Low Carbon Steel Part Used in the Deep Sea

2010 ◽  
Author(s):  
Sang-Seop Lim ◽  
Chung-Gil Kang
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Carbon Steel ◽  
Deep Sea ◽  
Low Carbon Steel ◽  
High Strength ◽  
Steel Part ◽  
Heat Treatment Condition ◽  
Low Carbon ◽  
Oil Consumption

With increasing oil consumption, we have to find more oil resources in the deep sea. The extreme working condition of the deep sea requires high toughness and high strength values at low temperatures. Academic institutions limited the chemical composition of the requested casting steel to meet their requirements of fracture toughness and weldability. Thus, the carbon content was set approximately 0.10% based on classification societies which required specific mechanical properties of strength, elongation, reduction area and impact energy (−40°C). In this study, we find the optimal heat treatment condition of low carbon steel (0.10%C) to obtain the desired mechanical properties at low temperature (−40°C) according to different quenching parameters (heating times) and tempering parameters (heating temperatures, cooling methods).

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