Study on the Dimensional Changes and Residual Stresses in Carbonitrided and Ferritic Nitrocarburized SAE 1010 Plain Carbon Steel

2010 ◽  
Vol 638-642 ◽  
pp. 829-834 ◽  
Author(s):  
Chun Yan Nan ◽  
Derek O. Northwood ◽  
Randy J. Bowers ◽  
Xi Chen Sun
Keyword(s):  
Heat Treatment ◽  
Carbon Steel ◽  
Residual Stresses ◽  
Surface Hardness ◽  
Surface Characteristics ◽  
Treatment Method ◽  
Plain Carbon Steel ◽  
Dimensional Changes ◽  
Modification Technique ◽  
Ferritic Nitrocarburizing

Carbonitriding is a metallurgical surface modification technique that is widely used in the automotive industry to increase surface hardness and wear resistance. Given the problems associated with carbonitriding, such as dimensional distortion, oxidation and non-uniform surface hardness, nitrocarburizing has been proposed as an alternative heat treatment method to improve the surface characteristics. The major advantages of ferritic nitrocarburizing are the minimal dimensional changes and distortion due to the low process temperature at which no phase transformations occur. This increases productivity and product quality, and decreases costs. The focus of this study was to determine the effects of carbonitriding and ferritic nitrocarburizing processes on the dimensional changes and residual stresses in a steel used for automotive applications. Navy C-ring specimens and prototype stamped parts made from SAE 1010 plain carbon steel were used in the testing. Gas, vacuum and ion ferritic nitrocarburizing processes with different heat treatment parameters were investigated. X-ray diffraction techniques were used for the residual stresses evaluation and surface phase analysis of the specimens.

A Study of the Influence of Local Heat Treatment on the Structure of Welded Titanium Pipelines

2021 ◽  
Vol 410 ◽  
pp. 37-41
Author(s):  
Natalia A. Astafeva ◽  
Andrey A. Balanovskiy ◽  
Anna A. Pershina
Keyword(s):  
Heat Treatment ◽  
Residual Stresses ◽  
Titanium Alloys ◽  
Welded Joints ◽  
Treatment Method ◽  
Local Heat ◽  
Optical Metallography ◽  
Heat Treated ◽  
Weld Structure ◽  
Heat Treatment Method

The article analyzes the results of a study of the influence of zonal heat treatment on the structure of welded joints of pipeline elements made of titanium alloys Ti-3.5Al-1.5Mn. In the manufacture of such structures, the TIG welding method is used to join pipe elements, after which the heat treatment method can be used to relieve residual stresses. The experiments have confirmed the effectiveness of zonal heat treatment preceded by welding. It was revealed that for welded joints made of titanium alloys, heat treatment can stabilize the structure. In experiments conducted by the method of optical metallography, the structure of heat treated and untreated welded joints was investigated. The influence of heat treatment on the weld structure and heat-affected zone was identified.

Ferritic Nitrocarburizing of SAE 1010 Plain Carbon Steel Parts

2015 ◽  
Vol 8 (2) ◽  
pp. 482-486
Author(s):  
Madhavan Manivannan ◽  
Vesselin Stoilov ◽  
Derek O. Northwood
Keyword(s):  
Carbon Steel ◽  
Plain Carbon Steel ◽  
Ferritic Nitrocarburizing

scholarly journals Improving the Inner Surface State of Thick-Walled Tubes by Heat Treatments with Internal Quenching Considering a Simulation Based Optimization

Processes ◽  
2020 ◽  
Vol 8 (10) ◽  
pp. 1303
Author(s):  
Fabian Mühl ◽  
Moritz Klug ◽  
Stefan Dietrich ◽  
Volker Schulze
Keyword(s):  
Heat Treatment ◽  
Residual Stresses ◽  
Surface State ◽  
Treatment Process ◽  
Treatment Method ◽  
Fe Model ◽  
Heat Treatment Process ◽  
Residual Stress State ◽  
Optimization Study ◽  
Inner Surface

Internal Quenching is an innovative heat treatment method for difficult to access component sections. Especially, the microstructure, as well as the residual stress state at inner surfaces, of thick-walled tubes can be adjusted with the presented flexible heat treatment process. Based on multiphysical FE-models of two different steels, a simulative optimization study, considering different internal quenching strategies, was performed in order to find the optimal cooling conditions. The focus hereby was on the adjustment of a martensitic inner surface with high compressive residual stresses. The simulatively determined optimal cooling strategies were carried out experimentally and analyzed. A good agreement of the resulting hardness and residual stresses was achieved, validating the presented Fe-model of the Internal Quenching process. The shown results also indicate that the arising inner surface state is very sensitive to the transformation behavior of the used steel. Furthermore, the presented study shows that a preliminary simulative consideration of the heat treatment process helps to evaluate significant effects, reducing the experimental effort and time.

scholarly journals Development of Large Surface Heat Treatment Method for Carbon Steel with High Power CO2 Laser (2nd Report)

1997 ◽  
Vol 63 (9) ◽  
pp. 1320-1324 ◽  
Author(s):  
Hiroyuki Yamamoto ◽  
Masashi Oikawa ◽  
Katsuhiro Minamida ◽  
Hiromichi Kawasumi
Keyword(s):  
Heat Treatment ◽  
Carbon Steel ◽  
Co2 Laser ◽  
High Power ◽  
Treatment Method ◽  
Surface Heat ◽  
Heat Treatment Method

scholarly journals Mechanical Properties of Burnished Steel AISI 1008

2018 ◽  
Vol 14 (4) ◽  
pp. 133-142
Author(s):  
Zeyad D. Kadhim ◽  
Mohammed Abdulraoof Abdulrazzaq ◽  
Wassan Suheil Hussain
Keyword(s):  
Surface Roughness ◽  
Fatigue Strength ◽  
Carbon Steel ◽  
Residual Stresses ◽  
Fatigue Limit ◽  
Surface Hardness ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Burnishing Process ◽  
Steel Aisi

Burnishing improves fatigue strength, surface hardness and decrease surface roughness of metal because this process transforms tensile residual stresses into compressive residual stresses. Roller burnishing tool is used in the present work on low carbon steel (AISI 1008) specimens. In this work, different experiments were used to study the influence of feed parameter and speed parameter in burnishing process on fatigue strength, surface roughness and surface hardness of low carbon steel (AISI 1008) specimens. The first parameter used is feed values which were (0.6, 0.8, and 1) mm at constant speed (370) rpm, while the second parameter used is speed at values (540, 800 and 1200) rpm and at constant feed (1) mm. The results of the fatigue test showed that improvement in fatigue limit, where the highest fatigue limit was obtained at (1mm feed, 1200rpm speed) in burnishing process which was (169 Mpa). The hardness results, showed increasing feed and speed values lead to increasing the hardness. The burnishing process reduces surface roughness by producing accurate and better surface finish. The best surface fineness of metal at (1mm feed and 1200 rpm speed) was 0.11 μm.

scholarly journals Surface Characteristics of Low Carbon Steel JIS G3101 SS400 after Sandblasting Process by Steel Grit G25

2021 ◽  
Vol 9 ◽  
Author(s):  
Muslimin Muslimin ◽  
◽  
Azam Milah Muhamad ◽  
Farid Triawan ◽  
Asep Bayu Dani Nandiyanto ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Surface Characterization ◽  
Visual Inspection ◽  
Surface Hardness ◽  
Low Carbon Steel ◽  
Surface Characteristics ◽  
Hardened Layer ◽  
Hardness Profile ◽  
Low Carbon ◽  
Paint Thickness

This research aims to study the surface characteristics of low carbon steel JIS G3101 SS400 processed by sandblasting using steel grit G25. The sandblasting process is conducted at a fixed nozzle pressure of 5 bar and pressure angle of 90o, and varying nozzle-to-surface distances at 15, 25, and 30 cm, and blasting durations of 25, 45, and 120 s. Surface characterization is firstly carried out by conducting observation on the surface’s morphology by SEM and chemical composition by EDS. Subsequently, visual inspection and measurement on surface roughness and hardness profile identification by Rockwell and micro-Vickers hardness tests are conducted. A paint thickness test using ASTM D7091 was undertaken to observe the surface characteristics related to the coating process. Based on the result, SEM found valleys, granules, micro-cracks, and grits embedded on the surface. The visual inspection shows the roughness is within the range of Sa2 - Sa3 of ISO 8501 with values are Ra 18.1 and Ra 21.4 µm. The hardened layer exhibits a maximum hardness value of 332 HV and a depth of more than 50 µm by sandblasting parameters of 15 cm distance and 120 s duration. Both roughness and hardness profiles are confirmed, increasing with closer nozzle-to-surface distance and longer blast duration. It is concluded that sandblasting using steel grit G25 is effective in improving the mechanical strength and surface hardness of low carbon steel SS400. These mechanical properties are essential in the paint coating of machinery applications such as pump, tank, ship, and pipeline.

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