scholarly journals Propriedades mecânicas das fases ferrita e austenita de aço inoxidável duplex

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Dias, D. F. ◽  
M. G. Diniz ◽  
Pimenta, A. R.
Keyword(s):  
Mechanical Strength ◽  
Stainless Steels ◽  
Petrochemical Industry ◽  
Vickers Microhardness ◽  
Duplex Stainless Steels ◽  
High Mechanical Strength ◽  
Metallographic Preparation ◽  
Analysis Of Results ◽  
Microstructure Of The Material ◽  
Preparation Techniques

Aços inoxidáveis duplex apresentam elevada resistência mecânica e resistência à corrosão, propriedades requeridas pelas indústrias petroquímicas. Esta combinação tem ampliado a utilização destes aços, e motivado diversas pesquisas. Os aços inoxidáveis duplex recebem este nome, devido à microestrutura ser formada por aproximadamente 50% de austenita e 50% de ferrita. Sabe-se que a dureza está diretamente relacionada à resistência mecânica, e que esta propriedade pode variar de acordo com a microestrutura do material. O objetivo do presente trabalho é avaliar e comparar a dureza das fases austenita e ferrita presentes nos aços duplex. Uma amostra foi preparada metalográficamente, sendo posteriormente atacada com a solução Behara pela técnica de “color etching”. Após o ataque químico as amostras foram submetidas a ensaios de microdureza Vickers, apresentando 247,8±35,1 HV0,1 e 263,22±11,6 HV0,1 para a ferrita e austenita, respectivamente. Após analise estatística dos resultados, concluiu-se que as fases ferrita e austenita possuem durezas similares. Duplex stainless steels have high mechanical strength and corrosion resistance properties required by the petrochemical industry. This combination has expanded the use of these steels, and motivated many studies. The duplex stainless steels are named because of the microstructure is formed by about 50% to 50% austenite and ferrite. It is known that the hardness is directly related to mechanical strength, and that this property can vary depending on the microstructure of the material. The objective of this study is to evaluate and compare the hardness of austenite and ferrite phases present in the duplex stainless steels. A sample was prepared by metallographic preparation techniques, and was then attacked with the solution BEHARA with technique of color etching. After etching the samples were tested for Vickers microhardness, with 247.8 ± 35.1 HV0, 1 and 263.22 ± 11.6 HV0, 1 for ferrite and austenite, respectively. After statistical analysis of results showed that the ferrite and austenite phases have similar hardness.  

Effects of Heat Input Conditions on the Local Thermophysical Properties of Super Duplex Stainless Steels

2018 ◽  
Vol 930 ◽  
pp. 317-321
Author(s):  
José Adilson de Castro ◽  
Gláucio Soares da Fonseca ◽  
D.S.S. Almeida ◽  
L.C.R. Lopes ◽  
C.R. Xavier ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Mechanical Strength ◽  
Stainless Steels ◽  
Thermal History ◽  
Duplex Stainless Steels ◽  
Measured Temperature ◽  
Sem Images ◽  
Super Duplex Stainless Steels ◽  
Welding Procedure

The thermal properties of the super duplex stainless steels are strongly affected by the thermal history when welding procedure are applied leading to substantial changes on the mechanical properties of the welding region. The controlled dual phase microstructure (ferrite and austenite) guarantee excellent mechanical properties such as mechanical strength and corrosion resistance, in addition to small thermal expansion coefficient and high thermal conductivity. In this research a model able to predict the thermal history of the welding pieces coupled with local mechanical properties developed during welding procedure is developed. The model was verified by measured temperature profile and used to predict local properties such as grain size evolution, hardness and mechanical strength. An inverse method was implemented to obtain the parameters fitting for the grain growth evolution, hardness and yielding strength compatible with the final microstructure and grain size measured using SEM images and stereological techniques.

SANDVIK 10RE51

Alloy Digest ◽  
1997 ◽  
Vol 46 (3) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Mechanical Strength ◽  
Physical Properties ◽  
Stainless Steels ◽  
Heat Treating ◽  
Good Resistance ◽  
High Mechanical Strength ◽  
Temperature Performance

Abstract Sandvik 10RE51 is a ferritic/austenitic duplex chromium-nickel stainless steel with both good resistance to pitting in aqueous solutions and good machinability. The alloy is often used over 300 series stainless steels when high mechanical strength is required. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, and joining. Filing Code: SS-676. Producer or source: Sandvik.

The influence of different heat treatment cycles on the properties of the steels HARDOX® 500 and STRENX® 700

2020 ◽  
pp. 67-74
Author(s):  
Bruno Gallina ◽  
Luciano Volcanoglo Biehl ◽  
Jorge Luis Braz Medeiros ◽  
José de Souza
Keyword(s):  
Heat Treatment ◽  
Mechanical Strength ◽  
Alloy Steel ◽  
Vickers Microhardness ◽  
Rolling Process ◽  
Low Alloy Steel ◽  
High Mechanical Strength ◽  
Hot Rolling Process ◽  
Microstructural Morphology ◽  
Full Annealing

The HARDOX® 500 and STRENX® 700 steels are quenched materials from hot rolling process. The HARDOX® 500 is a low alloy steel with high values of microhardness and mechanical strength, the STRENX® 700 steel is a low alloy steel structural used in applications, where low density is associated with high mechanical strength. In this work, the two steels were submitted to different heat treatments: quenched and tempering, normalization and full annealing. The effects of these heat cycles were analyzed by optical microscopy and Vickers microhardness techniques. It was concluded that in the normalization treatment, the microhardness reduction of HARDOX® was more significant than that one of STRENX®. In the quenched and tempering process, both presented higher microhardness compared to the originally produced and characterized material with higher austenitic grain refining. The HARDOX® presented an effective increase of microhardness. In the heat treatment of full annealing, the HARDOX® 500 and the STRENX® 700 steels had similar microhardness and microstructural morphology values.

DMV 59

Alloy Digest ◽  
2009 ◽  
Vol 58 (8) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Mechanical Strength ◽  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
High Mechanical Strength ◽  
Temperature Performance

Abstract DMV 59 is the material of choice for a wide variety of applications where significant corrosion resistance and high mechanical strength is necessary. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fracture toughness. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, and joining. Filing Code: Ni-672. Producer or source: Mannesmann DMV Stainless USA Inc.

BRILLIANT 2101 T-1 AP

Alloy Digest ◽  
2012 ◽  
Vol 61 (4) ◽  
Keyword(s):  
Fracture Toughness ◽  
Stainless Steel ◽  
Tensile Properties ◽  
Stainless Steels ◽  
Duplex Stainless Steels ◽  
Good Balance ◽  
Steel Wires

Abstract Stoody AP stainless steel wires are all-position wires. The nickel in this product will achieve a good balance of austenite and ferrite in lean duplex stainless steels. This datasheet provides information on composition and tensile properties as well as fracture toughness. It also includes information on forming and joining. Filing Code: SS-1118. Producer or source: Stoody Company.

BOFORS 2RM2

Alloy Digest ◽  
1965 ◽  
Vol 14 (5) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
Low Temperature ◽  
Mechanical Strength ◽  
Physical Properties ◽  
Tensile Properties ◽  
Cast Steel ◽  
Heat Treating ◽  
High Mechanical Strength ◽  
Temperature Performance

Abstract BOFORS 2RM2 is a hardenable stainless cast steel having good weldability, high mechanical strength and improved corrosion resistance. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on low temperature performance and corrosion resistance as well as casting, forming, heat treating, machining, and joining. Filing Code: SS-169. Producer or source: Aktiebolaget Bofors.

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