What is the microstructure of austenitic stainless steel?
What is the microstructure of austenitic stainless steel?
Austenitic stainless steels have a austenitic, face centered cubic (fcc) crystal structure. Austenite is formed through the generous use of austenitizing elements such as nickel, manganese, and nitrogen.
Is SS 304 a specification?
Alloy 304/304L (UNS S30400/ S30403) is the most widely utilized “18-8” chromium-nickel austenitic stainless steel. It is an economical and versatile corrosion resistant alloy suitable for a wide range of general purpose applications. Alloy 304/304L has excellent strength and toughness at cryogenic temperatures.
How do you make martensite?
In certain alloy steels, martensite can be formed by working the steel at Ms temperature by quenching to below Ms and then working by plastic deformations to reductions of cross section area between 20% to 40% of the original. The process produces dislocation densities up to 1013/cm2.
What is austenitic microstructure?
Austenite was originally used to describe an iron-carbon alloy, in which the iron was in the face-centred-cubic (gamma-iron) form. It is now a term used for all iron alloys with a basis of gamma-iron. Austenite in iron-carbon alloys is generally only evident above 723°C, and below 1500°C, depending on carbon content.
What is the microstructure of low carbon steel?
Low carbon steels consist primarily of ferrite, which is a solid solution phase of carbon dissolved in alpha-iron, a body centered cubic crystal. As the carbon content increases in the steel, an increasing amount of pearlite is formed in the microstructure of the metal.
What microstructure is martensite?
Martensite was originally named for a very hard, very brittle phase of steel that has needle-shaped microstructural features, with a microstructure being the arrangement of the phases on the microscopic scale. In steel, martensite forms due to the very fast cooling of a high-temperature phase called austenite.
How do you make tempered martensite?
Tempering is used to improve toughness in steel that has been through hardened by heating it to form austenite and then quenching it to form martensite. During the tempering process the steel is heated to a temperature between 125 °C (255°F) and 700 °C (1,292 °F).
What is 304L stainless steel used for?
AISI type 304L austenitic stainless steel (304L SS) is widely used in power, chemical, petrochemical[1] and nuclear industries[2]. Conventionally, stainless steels are fabricated by casting and forging processes.
What is the chemical composition of 304L SS plate?
For the present study, commercially available solution annealed 304L SS plates, with chemical composition Fe-18.52Cr -7.85Ni -0.016C-1.59Mn-0.29Si-0.003S-0.016P, have been used. The microstructure of the steel in as -received condition is shown in Figure1.
How to assess the suitability for semi-solid processing of steels?
All Rights Reserved3 from high melting point of these alloys, narrow semi-solid temperature range, and phase transformation during melting and solidification[10]. In addition to the processing-related issues, assessing the suitability for semi-solid processing of steels also requires evaluation of post -processing mechanical properties.
