Study of Hydrogen Permeation in a Micro-Alloyed Heat Treated Steel

2014 ◽  
Vol 353 ◽  
pp. 165-170 ◽  
Author(s):  
N. Lopez-Perrusquia ◽  
Marco Antonio Doñu-Ruíz ◽  
J.A. Ortega-Herrera ◽  
G. Urriolagoitia-Calderón ◽  
Yahir Edgar Vargas-Oliva
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Hydrogen Permeation ◽  
Pipeline Steel ◽  
Optical Analysis ◽  
Treated Steel ◽  
Heat Treated ◽  
Point Test ◽  
Heat Treated Steel ◽  
Type Of Fracture

In this work, an experimental research was conducted to determine of effects hydrogen permeation a micro-alloyed heat treatment steel in order to determine the mechanical properties of the material in this work [1]. Small specimens were taken from the micro-alloyed API-X60 steel. Moreover, by the technique of the three-point test according to ASTM 399-90, the load-displacement curves for each heat treatment with and without hydrogen permeation are determined. Likewise the samples were then mechanically tested for hardness by the technique of nanoindentation to obtain the elastic modulus and hardness of the studied specimens [2]. Scanning electron microscopy (SEM) determines the type of fracture; also EDS revealed the type of precipitate formed in the surface of the material [3]. The optical analysis showed the following microstructures; ferrite/pearlite, bainite/ferrite and martensite/retained-austenite [4]. Finally the experimental and statistical results showed effect of hydrogen permeation and heat treatment on the mechanical properties of the micro-alloyed API X-60 grade pipeline steel.

scholarly journals Process optimization of the mechanical properties of AISI 1020 steel quenched using maize-stover ash potash solution

2020 ◽  
Vol 39 (3) ◽  
pp. 821-829
Author(s):  
O.I. Ogunwede ◽  
M.S. Abolarin ◽  
A.S. Abdulrahman ◽  
O.A. Olugboji ◽  
J.B. Agboola ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Maize Stover ◽  
Test Pieces ◽  
Weighted Analysis ◽  
Orthogonal Array Method ◽  
Treated Steel ◽  
Heat Treated ◽  
Analysis Technique ◽  
The Individual ◽  
Heat Treated Steel

The process parameter optimization of maize-stover ash potash (MSAP) as a quenching medium for heat treatment of AISI-1020 steel was conducted in this study to improve the mechanical properties of steel after carburization and quenching. The optimization process utilized Taguchi L9(32) orthogonal array method to determine the individual Signal to Noise (S/N) ratio and Analysis of Variance (ANOVA). A multi-response weighted analysis technique was applied to derive combined quality responses of the heat treated test pieces. The result shows that the optimal factor level of MSAP solution strength was achieved at AM1BM1, which offered 57.6 HRC hardness, 39 J toughness and 1971 N/mm2 tensile strength as improved mechanical properties for the heat treated steel. Keywords: Optimization, MSAP, quenching, Taguchi, ANOVA

Microstructural Prediction of Heat Treated Steel Forgings for Severe Applications

2021 ◽  
Vol 1016 ◽  
pp. 236-242
Author(s):  
Ettore Anelli ◽  
M. Lucchesi ◽  
A. Chugaeva
Keyword(s):  
Heat Treatment ◽  
Microstructural Evolution ◽  
3D Fem ◽  
Simple Shape ◽  
Finite Volume Model ◽  
Volume Model ◽  
Optimal Heat Treatment ◽  
Treated Steel ◽  
Heat Treated ◽  
Heat Treated Steel

An in-house 2D finite volume model, specific for components of simple shape, was developed and applied to predict the thermal and microstructural evolution during heat treatment of steel forgings. The results of the thermal metallurgical modelling, including hardness profiles through the thickness, were compared with the experimental ones. Moreover, the 3D FEM software Deform-HT, able to calculate the thermal and microstructural evolution and the stress field during quenching, was specialized for the cases of interest. Examples of optimal heat treatment to develop the target microstructure and strength and reduce the risk of quenching cracks are discussed.

scholarly journals Studies of the Properties and Microstructure of Heat Treated 0.27% C and 0.84% Mn Steel

2018 ◽  
Vol 8 (5) ◽  
pp. 3484-3487
Author(s):  
M. I. Mohamed
Keyword(s):  
Heat Treatment ◽  
Cooling Water ◽  
Rolled Steel ◽  
Treatment Processes ◽  
Treated Steel ◽  
Heat Treated ◽  
Structural Applications ◽  
Different Temperatures ◽  
Mn Steel ◽  
Heat Treated Steel

In the present work, different heat treatments like hardening with different cooling rates followed by tempering at different temperatures have been performed. The material used in this study is carbon steel of 0.27% C and 0.84% Mn. Samples of as-rolled steel were subjected to different heat treatment processes. The steel was heated to the austenitizing temperature of 870°C for 2hrs followed by water quenching, oil quenching, air and furnace cooling. Water and oil quenched samples were subjected to tempering for one hour at temperatures of 250°C, 350°C, 450°C and 550°C. Tensile and impact tests were carried out for as rolled and heat-treated steel. Results show that the heat treated steel revealed an excellent combination of tensile strength and impact strength, which is suitable for structural applications. Optical metallographic investigation was carried out for all samples compared with the as rolled steel. The heat treatment revealed remarkable changes in steel morphology and mechanical properties.

Characterization Microstructural and Mechanical of X-60 Steel Heat-Treated

2012 ◽  
Vol 1481 ◽  
pp. 63-69
Author(s):  
N. López Perrusquia ◽  
J. A. Ortega Herrera ◽  
M.A. Doñu Ruiz ◽  
V. J. Cortes Suarez ◽  
L. D. Cruz Rosado
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Nano Indentation ◽  
Loading Rates ◽  
Second Stage ◽  
Heat Treated ◽  
Point Test ◽  
Type Of Failure ◽  
Steel Heat

ABSTRACTIn this paper was study the effect of heat treatment on mechanical properties of an API X-60 steel used for storage and transportation of hydrocarbons.In the first stage evaluation are mechanical properties of steel heat treated by the technique of the three-point test according to ASTM 399-90 was carried out. In the second stage, characterization of the type of failure and microstructure through optical microscopy (OM) was determined; also heat treated samples were then mechanically tested for hardness (HRC) and nano-indentation. The presence of alloying elements by scanning electron microscopy (SEM) and the fracture surfaces generated in the steel with varying times, temperatures and cooling medium generated by different modes of solicitation (Bending), likewise with loading rates were determined. The results revealed a ductile fracture and microstructures (PF) ferrite-pearlite (DP), bainite -ferrite (BF) and martensite-retained and martensite/retained austenite (MA). Finally, this article discusses the effect of heat treatment followed by precipitation hardenable of steel API X-60 on the mechanical properties

Crystallographic Texture of Induction-Welded and Heat-Treated Pipeline Steel

2010 ◽  
Vol 89-91 ◽  
pp. 651-656 ◽  
Author(s):  
P. Yan ◽  
Özlem Esma Güngör ◽  
Philippe Thibaux ◽  
Harshad K.D.H. Bhadeshia
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Grain Size ◽  
Treatment Process ◽  
Pipeline Steel ◽  
Large Diameter ◽  
Seam Welding ◽  
Steel Pipes ◽  
Simple Observation ◽  
Heat Treated

Large-diameter steel pipes are produced by induction seam-welding followed by induction-assisted heat treatment. The microstructure and distribution of crystal orientations have been studied and related to the mechanical properties of the welded regions. The welding and heat-treatment process leads to a microstructure, a simple observation of which can not explain the observed variations in toughness in the vicinity of the welding joint, because the crystallographic grain size, which represents the scale of similarly oriented adjacent grains, is much coarser than the ordinary grain size. Furthermore, heating the affected zone into the austenite phase field followed by cooling does not completely eliminate the coarse regions of similarly oriented grains. The consequences of this on mechanical properties are discussed.

Processing and characterization of high strength dual-phase steel by two-step intercritical heat treatment process

2018 ◽  
Vol 233 (3) ◽  
pp. 581-588 ◽  
Author(s):  
Praveen Singh ◽  
Satnam Singh ◽  
Sanchit Mewar
Keyword(s):  
Heat Treatment ◽  
Tensile Strength ◽  
Treatment Process ◽  
Heat Treatment Process ◽  
X Ray Diffraction ◽  
X Ray ◽  
Treated Steel ◽  
Heat Treated ◽  
Intercritical Heat Treatment ◽  
Heat Treated Steel

A simple approach of two-step intercritical heat treatment has been employed to study the effect of heat treatment on the evolution of microstructures and their effect on the mechanical properties of alloy steel (AISI 1012). The selected steel samples were directly placed in the preheated furnace and were progressively heat treated in two steps, intercritically between the Ac1–Ac3 temperature range. Immediate water quenching (preheated at 30 ℃) was carried out after heat treatment cycles. The processed steels were characterized by examining the X-ray diffraction patterns, microstructures, Vickers microhardness, and tensile strength. The normalized X-ray diffraction results of heat-treated steels revealed the substantial growth in the martenistic phases. The microstructures of heat-treated steel revealed the formation of needle-shape-like structures, which corresponds to the martenistic phase. The increased formation of martenistic phase due to the intercritical heat treatment process improved the overall microhardness (from 188 ± 9 HV of the parent steel to 412 ± 32 HV for 800 ℃ heat-treated steel) up to 2.2 times. The presence of soft and ductile (ferritic and pearlite) phases simultaneously with tough and strong (martenistic) phase allowed the improvement in the ultimate tensile strength. In comparison to parent steel with tensile strength of 510 ± 15 MPa, the intercritical heat treatment steel at 800 ℃ revealed 169.6% higher tensile strength of 1375 ± 35 MPa. However, percentage elongation was reduced by 60%, i.e. from 13 ± 1% for parent steel to 5.2 ± 2% of intercritical heat treatment steel (processed at 800 ℃). An overall study revealed that by a proper intercritical heat treatment process, dual-phase steels with better structure–properties correlation can be obtained for industrial applications.

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