scholarly journals Study of the mechanical properties of low carbon content HSLA steels

2009 ◽  
Vol 45 (6) ◽  
pp. 424-431 ◽  
Author(s):  
S. Illescas ◽  
J. Fernández ◽  
J. Asensio ◽  
M. Sánchez-Soto ◽  
J. M. Guilemany
Keyword(s):  
Mechanical Properties ◽  
Carbon Content ◽  
Low Carbon ◽  
Hsla Steels

Electron Microscope studies of the microstructures in as-quenched and aged HSLA-100 production steels and correlation with mechanical properties

1991 ◽  
Vol 49 ◽  
pp. 582-583
Author(s):  
A.G. Fox ◽  
V.R. Mattes ◽  
S. Mikalac ◽  
M.G. Vassilaros
Keyword(s):  
Mechanical Properties ◽  
High Strength ◽  
Low Carbon ◽  
Austenite Grain Size ◽  
Solid Solution Strengthening ◽  
Austenite Grain ◽  
Microstructure And Mechanical Properties ◽  
Hsla Steels ◽  
Carbonitride Precipitation ◽  
Strength And Toughness

Because of their excellent weldability, high strength low alloy (HSLA) ultra low carbon bainitic (ULCB) steels are finding increasing applications in ship and submarine construction. In order to achieve the required strength and toughness in ULCB HSLA steels it is necessary to control chemical composition and thermo-mechanical processing very carefully so that the desired microstructure and mechanical properties can be achieved. For instance HSLA 100 ULCB steel (nominal yield strength 100 ksi) used by the U.S. Navy in shipbuilding applications can derive its strength and toughness from the following sources:- (1) solid solution strengthening (2) small prior austenite grain size derived from niobium carbonitride precipitation at austenite grain boundaries (3) dislocation substructure and (4) from copper precipitates (in aged alloys). The object of the present work is to correlate the microstructure and mechanical properties of production batches of HSLA 100 in the quenched and aged conditions. Because many of the salient features of these microstructures are submicron in size it was found necessary to use SEM and TEM.

scholarly journals ST37 Steel Carburization with Coconut Charcoal

2021 ◽  
Vol 3 (1) ◽  
pp. 29-35
Author(s):  
Melya Dyanasari Sebayang
Keyword(s):  
Mechanical Properties ◽  
Carbon Content ◽  
Carbon Steels ◽  
Coconut Shell ◽  
Low Carbon ◽  
The Core ◽  
Coconut Charcoal ◽  
Hardening Process ◽  
St37 Steel ◽  
Carburizing Process

The carburization process is a surface hardening process where carbon is added to the surface without changing the core properties of the material. This process is carried out at the austenite temperature so that the carbon can diffuse into the phase. This process can only be done on low carbon steels with content below 0.25%. This research was conducted on ST37 steel, which is steel with low carbon content with 0.18% carbon content. This type of steel is surface hardened with a carburizing temperature of 850 C with a long lasting time of 1 hour, then it is carried out under moderate cooling with outside air media. And change its mechanical properties from the comparison of the initial mechanical properties of the specimen. The highest hardness value occurs in the carburizing process of coconut shell charcoal, but this hardness value occurs not because of the carburization process but because of the enlarged grain size caused by heating at temperatures below 723⁰ C, thus reducing the elongation properties of the material. Carburizing with battery stone media is more efficient than coconut shell charcoal at temperatures below 723 C. Because the temperature is below the austenite temperature, the absorbed carbons cannot diffuse as happened in the carburization process, but the absorbed carbons can bind the grain boundaries and change their hardness by 4%. In the microstructure research that occurs in this process nothing can change its phase because the temperature does not reach the austenite temperature. However, there are differences in the microstructure between the carburization process with coconut shell charcoal media.

scholarly journals Battery on Carburization ST 37 Steel

2021 ◽  
Vol 3 (2) ◽  
pp. 109-114
Author(s):  
Melya Dyanasari Sebayang
Keyword(s):  
Mechanical Properties ◽  
Carbon Content ◽  
Grain Boundaries ◽  
Surface Hardening ◽  
Carbon Steels ◽  
Low Carbon ◽  
Low Carbon Steels ◽  
The Core ◽  
Hardening Process

A surface hardening process by adding carbon to its surface without changing the core properties of the material is called the carburization process. This process is carried out at the austenite temperature so that the carbon can diffuse into the phase. This process can only be done on low carbon steels with a content of below 0.25%. This research uses ST 37 steel which is a low content steel with a carbon content of 0.18%. This type of steel is surface hardened with a carburizing temperature of 850°C for a long lasting time of 1 hour, then it is carried out under moderate cooling with outside air media. This research produces a carburizing method with carbon battery media that easily breaks down into steel, which occurs in carbon batteries at temperatures below 723°C. And change its mechanical properties from the comparison of the initial mechanical properties of the specimen. Carburizing with battery rock media is more efficient at temperatures below 723°C. Because of at temperatures below austenite or below the carburizing temperature of carbon from the batteries, it can absorb the surface of the steel even though the amount is still very small. Because the temperature is below the austenite temperature, the absorbed carbons cannot diffuse as happened in the carburization process, but the absorbed carbons can bind the grain boundaries so that they change their hardness by 4%. The microstructure in the research that occurs in this process has nothing to change its phase because the temperature does not reach the austenite temperature.

Study on Thickness of Low Carbon Steel in Rapid Cooling Process: A Short Review

2020 ◽  
Vol 4 (1) ◽  
pp. 52-59
Author(s):  
Siti Noradila Abdullah ◽  
Norazlianie Sazali ◽  
Ahmad Shahir Jamaludin
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Carbon Steel ◽  
Carbon Content ◽  
Treatment Process ◽  
Low Carbon Steel ◽  
Case Hardening ◽  
Heat Treatment Process ◽  
Low Carbon ◽  
Molecular Arrangement

For any process that engaged with changes of chemical properties and physical is a heat treatment process by cooling or heating a metal. The technique for heat treatment includes, case hardening, annealing, tempering and precipitation strengthening, quenching and tempering. The mechanical properties like hardness, toughness and ductility can be altered by intense heat treating on steel to produce different mechanical properties. This matters with the carbon content in low carbon steel such as mild steel with above 0.4% carbon, in Medium carbon steel with above 0.8% carbon, and in High Carbon Steel with up to 2% carbon content in steels. To change the characteristics of metals and alloys is by heat treatment process where by altering the diffusion and cooling rate within its microstructure to make them suitable for any kind of usage by changing the grain size at different phases and changing the molecular arrangement.

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