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

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 Influence of carbonitriding conditions on phase composition and residual stresses for 20MnCr5 low alloy steel

2021 ◽  
Vol 47 (2) ◽  
pp. 790-799
Author(s):  
Richard J Katemi ◽  
Jeremy Epp
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Alloy Steel ◽  
Retained Austenite ◽  
Case Depth ◽  
Martensite Phase ◽  
Stress Distributions ◽  
Low Alloy Steel ◽  
The Core ◽  
Core Hardness

This paper reports an investigation of the influence of carbonitriding conditions for 20MnCr5 low alloy steel. Three gaseous carbonitriding conditions were investigated based on different carbon and nitrogen potentials to attain varying levels of carbon between 0.62 and 0.93% mass, whereas for nitrogen between 0.19 and 0.26% mass at the surface. Analysis of retained austenite and residual stress distributions was conducted using X-ray diffraction technique. The effective case depth varied between 900 and 1200 µm. The case microstructures were characterized by varying proportions of retained austenite and martensite, while the core contained essentially bainitic microstructures. The maximum amount of retained austenite which occurred at a depth of 50 µm from the subsurface ranged between 30 and 70% mass and significantly influenced the level of surface micro-hardness whereas the core hardness remaining relatively constant at 450 HV1. High values of residual stresses in martensite phase were observed. The signs, magnitudes, distributions and location of maximum compressive residual stresses were highly influenced by the maximum fraction of retained austenite. Retained austenite of 30%, 50% and 70% mass at the surface lead to peak compressive residue stresses of -280, -227, and -202 MPa at depths of 555, 704, and 890 μm, respectively. Keywords: Carbonitriding, retained austenite, martensite, residual stress, XRD.

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.

A Repeated Impact Method and Instrument to Evaluate the Impact Fatigue Property of Drillpipe

2012 ◽  
Vol 22 (4) ◽  
pp. 1064-1071 ◽  
Author(s):  
Yuanhua Lin ◽  
Qiang Li ◽  
Yongxing Sun ◽  
Hongjun Zhu ◽  
Ying Zhou ◽  
...  
Keyword(s):  
Fatigue Property ◽  
Impact Fatigue ◽  
Repeated Impact ◽  
The Impact

Evolution of Microstructure and Properties of a Disk Cutter Ring Material during Carburization and Heat Treatment

2013 ◽  
Vol 652-654 ◽  
pp. 1838-1841 ◽  
Author(s):  
Guo Biao Lin ◽  
Zhong Jian Zhang ◽  
Mao Qing Wang ◽  
Su Min Zhu
Keyword(s):  
Heat Treatment ◽  
Surface Hardness ◽  
Case Depth ◽  
Disk Cutter ◽  
The Core ◽  
Core Hardness ◽  
Evolution Of Microstructure ◽  
The Impact ◽  
Carbide Particles ◽  
Quenching And Tempering

This paper presents the research on the influence of carburizing and heat treatment on the properties and microstructure of a new medium carbon alloy steel Fe-0.39C-0.99Si -0.37Mn -5.06Cr-1.21Mo-0.75V (wt.%) used for disk cutter ring. The carburized case has secondary cementite besides those appeared in core such as pearlite and some carbides of Cr, Mo and V. Microstructure of the case is coarse and there are more and larger carbide particles than in core. After quenching and tempering, the carburized case and the core transformed into the microstructure comprised mostly of troostite and fully precipitated tiny carbide particles of Cr, Mo and V. The grains in the carburized case are still larger and the quantity of carbide precipitations including cementite is larger compared with that in the core. Finally, the case depth of about 1mm can be obtained; the surface hardness is above 60HRC; the core hardness is above 55HRC; and the impact toughness reaches 16.9 kJ/cm2.

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