Improving the accuracy of case depth measurements in carburized steel using a combination of electromagnetic test methods

2014 ◽  
Author(s):  
Robert Meyendorf ◽  
Daniel Eylon
Keyword(s):  
Test Methods ◽  
Case Depth ◽  
Electromagnetic Test ◽  
Carburized Steel

scholarly journals Microstructure, Hardness, and Tensile Properties of Vacuum Carburizing Gear Steel

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 300
Author(s):  
Wu Chen ◽  
Xiaofei He ◽  
Wenchao Yu ◽  
Maoqiu Wang ◽  
Kefu Yao
Keyword(s):  
Tensile Properties ◽  
Tensile Tests ◽  
Case Depth ◽  
Strain Hardening Exponent ◽  
Austenitizing Temperature ◽  
Vacuum Carburizing ◽  
Experimental Steel ◽  
Strain Behavior ◽  
Carburized Steel ◽  
Vacuum Carburization

We investigated the effects of the austenitizing temperature on the microstructure, hardness, and tensile properties of case-carburized steel after vacuum carburization at 930 °C and then re-austenitization at 820–900 °C followed by oil quenching and tempering. The results show that fractures occurred early with the increase in the austenitizing temperature, although all the carburized specimens showed a similar case hardness of 800 HV0.2 and case depth of 1.2 mm. The highest fracture stress of 1919 MPa was obtained for the experimental steel when the austenitizing temperature was 840 °C due to its fine microstructure and relatively high percentage of retained austenite transformed into martensite during the tensile tests. We also found that the stress–strain behavior of case-carburized specimens could be described by the area-weighted curves of the carburized case and the core in combination. The strain hardening exponent was about 0.4 and did not vary with the increase in the austenitizing temperature. We concluded that the optimum austenitizing temperature was around 840 °C for the experimental steel.

Effect of Soaking Time on Paste Carburizing of Carburized Low Carbon Steel

2017 ◽  
Vol 740 ◽  
pp. 93-99
Author(s):  
Muhammad Hafizuddin Jumadin ◽  
Bulan Abdullah ◽  
Muhammad Hussain Ismail ◽  
Siti Khadijah Alias ◽  
Samsiah Ahmad
Keyword(s):  
Carbon Steel ◽  
Carbon Content ◽  
Low Carbon Steel ◽  
Case Depth ◽  
Carbon Steels ◽  
Low Carbon ◽  
Soaking Time ◽  
Low Carbon Steels ◽  
Carburized Steel ◽  
Carburizing Process

Increase of soaking time contributed to the effectiveness of case depth formation, hardness properties and carbon content of carburized steel. This paper investigates the effect of different soaking time (7-9 hours) using powder and paste compound to the carburized steel. Low carbon steels were carburized using powder and paste compound for 7, 8 and 9 hours at temperature 1000°C. The transformation of microstructure and formation carbon rich layer was observed under microscope. The microhardness profiles were analyzed to investigate the length of case depth produced after the carburizing process. The increment of carbon content was considered to find the correlation between types of carburizing compound with time. Results shows that the longer carburized steel was soaked, the higher potential in formation of carbon rich layer, case depth and carbon content, which led to better hardness properties for carburized low carbon steel. Longer soaking time, 9 hours has a higher dispersion of carbon up to 41%-51% compare to 8 hours and 7 hours. By using paste carburizing, it has more potential of carbon atom to merge the microstructure to transform into cementite (1.53 wt% C) compare to powder (0.97 wt% C), which increases the hardness of carburized steel (13% higher).

scholarly journals Effects of Case Depth and Notch Shape on the Rotating Bending Fatigue Properties of Carburized Steel

1980 ◽  
Vol 66 (3) ◽  
pp. 410-417 ◽  
Author(s):  
Tôru FURUKAWA ◽  
Shizuyo KONUMA ◽  
Hideyasu SAKANIWA ◽  
Tadashi KASUYA
Keyword(s):  
Case Depth ◽  
Fatigue Properties ◽  
Bending Fatigue ◽  
Carburized Steel ◽  
Rotating Bending Fatigue ◽  
Rotating Bending

scholarly journals Study on Carburized Steel Used in Maritime Industry: The Influences of Carburizing Temperature

2019 ◽  
Vol 2 (1) ◽  
pp. Manuscript
Author(s):  
Thee Chowwanonthapunya ◽  
Xin Mu ◽  
Chaiyawat Peeratatsuwan
Keyword(s):  
Mild Steel ◽  
Case Depth ◽  
Hardness Profile ◽  
Erosion Wear ◽  
Maritime Industry ◽  
Carburized Steel

This paper aims to examine the influences of the carburizing temperature of the carburized mild steel. The carburizing treatment was carried out at carburizing temperature of 800 and 900 °C with fixed carburizing time of 1 hr. The results indicate that carburization treatment can improve the hardness of samples. However, the almost unchanged in hardness profile of the carburized steel was found in the carburized mild steel at the carburizing temperature of 800 °C.  The carburation carried at the carburizing temperature of 900 °C can significantly enhance the hardness conditions and also increase the case depth of carburized mild steel. The carburized steel can provides the tough as well as durable surface against the severe degradations, such as marine erosion, wear and cavitation in the maritime applications.

scholarly journals Effect of Core Hardness and Case Depth on Low-Cycle-Impact-Fatigue Property in Carburized Steel

2003 ◽  
Vol 52 (11) ◽  
pp. 1318-1324 ◽  
Author(s):  
Masayuki HORIMOTO ◽  
Hitoshi MATSUMOTO ◽  
Taizo MAKINO ◽  
Nobuhiro MURAI ◽  
Kazuyuki ORITA ◽  
...  
Keyword(s):  
Fatigue Property ◽  
Case Depth ◽  
Impact Fatigue ◽  
Carburized Steel ◽  
Core Hardness

Fatigue Life Prolongation of Carburized Steel by Means of Shot-Peening

2006 ◽  
Vol 505-507 ◽  
pp. 775-780 ◽  
Author(s):  
Shigeyoshi Haga ◽  
Yasunori Harada ◽  
Harushige Tsubakino
Keyword(s):  
Residual Stress ◽  
Fatigue Life ◽  
Shot Peening ◽  
Compressive Residual Stress ◽  
Surface Hardness ◽  
Superficial Layer ◽  
Case Depth ◽  
Grain Sizes ◽  
Carburized Steel ◽  
Life Prolongation

In this study, we’ve used carburized-quenched-tempered steels that received shot-peening process with different shot grain sizes and evaluated variation of surface property of the steels. As a result of study, it is demonstrated that the fatigue life of carburized steels can be prolonged significantly by increasing surface hardness and compressive residual stress and by reducing surface roughness and abnormal carburized case depth at superficial layer, which we’ve investigated in the study.

Laboratory proficiency in susceptibility testing of Helicobacter pylori using agar dilution and E test methods

2001 ◽  
Vol 120 (5) ◽  
pp. A586-A587
Author(s):  
L BEST ◽  
S JO ◽  
V VANZANTEN ◽  
D HALDANE ◽  
V LOO ◽  
...  
Keyword(s):  
Helicobacter Pylori ◽  
Susceptibility Testing ◽  
Test Methods ◽  
Agar Dilution
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