29,982 research outputs found
Mathematical Modelling to Predict Nitrided Layer Thickness of Low Temperature Gas and Plasma Nitriding of AISI 316 L Stainless Steel (Austenitic)
Austenitic stainless steel is one of the world most produced alloy for stainless
steel production mainly due to its high corrosion resistance properties. However,
austenitic stainless steel low surface hardness have always been an important issue to
address. Therefore, many studies have been conducted in order to increase the
surface hardness of the austenitic stainless steel without significantly affect the
corrosion resistance characteristic of the stainless steel. The author’s study compose
only on the austenitic stainless steel type AISI 316L which is among the most
produced stainless steel in the whole world
Study of the Physical and Mechanical Properties of Sintered Nitrided Austenitic Stainless Steel Powder
This project presents the work on high temperature gas nitriding of austenitic stainless steel powder. Nitriding is one of the methods used in surface engineering to increase the hardness and wear resistance of austenitic stainless steel. Normally nitriding is done at bulk of steel but for this project different technique is chosen where nitriding is done on the powder of the austenitic stainless steel. The problem is when nitriding bulk austenitic stainless steel; the solid state diffusion will take place only at low case depth. However by nitriding the powder of austenitic stainless steel, the nitrogen content will be extended to the core of the steel
Preparation and characterization of electrolytic alumina deposit on austenitic stainless steel
Conversion coating modified by alumina has been studied as a way for improving the resistance to thermal oxidation of an austenitic stainless steel. Conversion coating, characterized by a particular morphology and strong interfacial adhesion with the substrate, facilitate the electrochemical deposition of ceramic layers and enhance their adhesion to the substrate. The influence of the current density and treatment time on alumina deposit was studied using statistical experimental designs like Doehlert uniform shell design. After heating, coatings present a continuous composition gradient with refractory compounds at the surface. The behavior at high temperature (1000 8C) of the alumina coating was investigated. The presence of alumina increases the oxidation resistance of an austenitic stainless steel at 1000 8C. The morphology and the chemical composition of the deposit are analyzed. Results on the thermal stability of coating on austenitic stainless steel are presented
Numerical study on stainless steel I-shaped links on eccentrically braced frames
Strength, ductility and strain-hardening on austenitic stainless steel are interesting structural properties that suggest a potential strategic structural application as dissipative members in seismic-resistant systems. Eccentrically braced frames (EBF) are structural systems that dissipate energy during seismic episode by means of shear- or bending-shear related mechanisms in particular elements commonly referred to as links. The use of austenitic stainless steel in these links may represent an interesting alternative for EBF. As a strategic solution aimed at exploiting the stainless steel structural properties, non-dissipative zones may be assembled with carbon steel whereas dissipative zones may be assembled with austenitic stainless steel. This paper presents a numerical study on austenitic stainless steel, I-shaped, short links on EBF subjected to cyclic loading. The study encompasses a set of parametric analysis in which the web slenderness, transverse stiffening and material properties of the elements are systematically varied. Strain-hardening, energy dissipation and residual displacement are evaluated for stainless steel links and the carbon steel counterparts. The results suggest that austenitic stainless steel links may provide to the EBF system an interesting solution that enhances their overall behaviour during energy dissipation-related episodes.Peer ReviewedPostprint (author's final draft
Friction Welding of Austenitic Stainless Steel with Copper Material
Austenitic stainless steels are most preferred over other types of stainless steel families. Welding of stainless steel using friction welding is widely seen in the current scenario. Since the time consumed for friction welding is very less, metallurgical defects are almost reduced without pre- and postheat treatment. The problems encountered in friction welding during joining of austenitic stainless steel are very limited when compared to fusion welding process. The studies have undergone with joining of austenitic stainless steel and copper material to evaluate the friction welding parameter for finding the good bond strength
A study of sensitization in types 301 and 304L stainless steels using Moessbauer spectroscopy
Mossbauer spectroscopy used to study sensitization in austenitic stainless steel
Joining refractory/austenitic bimetal tubing Supplemental report
Joining bimetal tubing consisting of austenitic stainless steel with inner lining of niobium or tantalu
Effect of electromagnetic stirring on solidification structure of austenitic stainless steel in horizontal continuous casting
An investigation on the influence of low frequency rotary electromagnetic stirring on solidification structure of austenitic stainless steel in horizontal continuous casting was experimentally conducted and carried out on an industrial trial basis. The results show that application of appropriate electromagnetic stirring parameters can obviously improve the macrostructure of austenitic stainless steel, in which both columnar and equiaxed grains can be greatly refined and shrinkage porosity or cavity zone along centerline can be remarkably decreased due to eliminating intracrystalline and enlarging equiaxed grains zone. The industrial trials verify that the electromagnetic stirring intensity of austenitic stainless steel should be higher than that of plain carbon steel. Electromagnetic stirring has somewhat affected the macrostructure of austenitic stainless steel even if the magnetic flux density of the electromagnetic stirring reaches 90 mT (amplitude reaches 141 mT) in average at frequency f=3-4Hz, which provides a reference for the optimization of design and process parameters when applying the rotary electromagnetic stirrer
Bearing and tearout of austenitic and duplex stainless steel bolted connections
Due to the unique material characteristics of stainless steel, the bearing and tearout behaviour of stainless steel bolted connections can be different from that of carbon steel bolted connections. Such difference has been gradually recognised in recent design provisions for stainless steel structures. However, it is noteworthy that the existing design methods were mainly developed for austenitic and ferritic stainless steel bolted connections. Their applicability to duplex stainless steel bolted connections is questionable. Moreover, comparing to the bearing failure of stainless steel connections, less attention has been paid to the tearout failure, as well as the combined bearing and tearout failure in multi-bolt connections. To fill these gaps, an experimental and numerical study is carried out on the bearing/tearout behaviour and design of stainless steel bolted connections. The experimental programme includes 22 connection specimens with either single-bolt or multi-bolt configurations, made of austenitic or duplex stainless steel. The experimental tests are supplemented by a comprehensive numerical parametric study with more than 200 individual models, performed based on a validated finite element modelling technique. The obtained test and numerical results are used to assess the effects of different design parameters, as well as the applicability of existing design methods. It is concluded that the ultimate bearing/tearout resistances of austenitic and duplex connections are not simply proportionate to the ultimate strengths of the two materials. Given the same geometric design, the bearing resistance of a duplex connection is considerably higher than that of an austenitic connection, despite the similar ultimate strengths of the two materials. This difference in bearing performance is attributed to the different strain-hardening characteristics of austenitic and duplex materials, as well as the premature shear cracking in austenitic connections that leads to insufficiently developed strain-hardening. In comparison, the tearout resistances of austenitic and duplex connections with the same geometry are much closer, since the smaller end distance leads to more uniform deformations and more completely developed strain-hardening. Moreover, the combined bearing and tearout resistance of multi-bolt connections is found to be lower than the sum of the respective resistances of individual bolts. Finally, an updated design method is proposed that can accurately predict the bearing/tearout resistance of both austenitic and duplex stainless steel bolted connections. Proper partial factors are determined for the proposed method based on a reliability analysis
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