scholarly journals Influence of crack-like surface defects on the fatigue limit of nitrocarburized carbon steel

2018 ◽  
Vol 372 ◽  
pp. 012005 ◽  
Author(s):  
Y Yamada ◽  
H Eto ◽  
J Konya ◽  
K Takahashi
Keyword(s):  
Carbon Steel ◽  
Fatigue Limit ◽  
Surface Defects

On the Decrease of Fatigue Limit Due to Small Prestrain

1992 ◽  
Vol 114 (3) ◽  
pp. 317-322 ◽  
Author(s):  
Y. Nagase ◽  
S. Suzuki
Keyword(s):  
Growth Rate ◽  
Carbon Steel ◽  
Fatigue Limit ◽  
Surface Crack ◽  
Fatigue Behavior ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Small Surface ◽  
Bending Tests ◽  
Rotating Bending

Fatigue behavior of plain specimens of low carbon steel subjected to small tensile prestrain is investigated through rotating bending tests and the mechanism of the decrease of fatigue limit due to the prestrain is discussed. It is found that 3 percent prestraining causes the acceleration of both slip and crack initiations, and increases the growth rate of a small surface crack of less than 0.3 mm. It also decreases the fatigue limit. If prestrained material is aged, the fatigue limit increases. These effects of the small prestrain are explained based on the unpinning of locked dislocations due to the prestrain.

Ultrasonic Transmission Characteristics of Continuous Casting Slab for Medium Carbon Steel

2005 ◽  
Vol 297-300 ◽  
pp. 2201-2206
Author(s):  
Jun Youn Lee ◽  
Soon Bok Lee ◽  
Jae Kyung Yi
Keyword(s):  
Carbon Steel ◽  
Continuous Casting ◽  
Surface Defects ◽  
Medium Carbon Steel ◽  
Carbon Steels ◽  
Ultrasonic Waves ◽  
Transmission Characteristics ◽  
Medium Carbon ◽  
Continuous Casting Slab ◽  
On Line

Until now, surface defects of continuous casting slab have been removed by the enforced surface scarfing to produce high quality steel materials. An evaluation technique for surface and internal defects of slab is required to enhance the production of medium carbon steels and acquire defect-map. Accordingly as a preliminary step, longitudinal wave testing and Rayleigh wave testing were carried out on slab specimens of medium carbon steel to get basic transmission characteristics of ultrasonic waves. This research provides as basic data for on-line defect estimation using a laser ultrasonic or EMAT in non-contact ultrasonic detecting techniques in future.

Effect of prestrain on and prediction of fatigue limit in carbon steel

2007 ◽  
Vol 29 (9-11) ◽  
pp. 1855-1862 ◽  
Author(s):  
M KANG ◽  
Y AONO ◽  
H NOGUCHI
Keyword(s):  
Carbon Steel ◽  
Fatigue Limit

Investigation on the peak temperature and surface defects on the carbon steel treated by rotating CW laser

2021 ◽  
Vol 135 ◽  
pp. 106727
Author(s):  
Shusen Zhuang ◽  
Shigenobu Kainuma ◽  
Muye Yang ◽  
Manabu Haraguchi ◽  
Takahiro Asano
Keyword(s):  
Carbon Steel ◽  
Surface Defects ◽  
Peak Temperature ◽  
Cw Laser

Effect of Crack Initiation Size on Fatigue Strength in 0.85% Carbon Steel

2013 ◽  
Vol 750 ◽  
pp. 112-115 ◽  
Author(s):  
Chobin Makabe ◽  
Tatsujiro Miyazaki ◽  
Naoki Nakane ◽  
Shinya Yamazaki ◽  
Takashi Makishi ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Crack Length ◽  
Fatigue Limit ◽  
Pure Aluminum ◽  
Low Carbon Steel ◽  
Lamellar Microstructure ◽  
Initial Crack ◽  
Crack Growth Behavior ◽  
Low Carbon ◽  
Initial Crack Length

The fatigue limit of a plain specimen of a tool steel JIS SK85 was investigated. The initial crack length in the fatigue process is related to the size of a single crystal in the case of low carbon steel. However, that is independent of the crystal size in the case of pure aluminum, a lamellar pearlitic steel, etc. In this study, the relationship between the initial crack length and the fatigue limit was investigated. The original microstructure of this material includes a spherical microstructure. However, after heat treatment under some conditions, that microstructure changed to a lamellar microstructure. The fatigue limit of heat-treated SK85 could be evaluated by an equation in which the parameters are the hardness and initial crack length. Finally, this result was discussed based on the observations of crack growth behavior and fracture surface.

Measurement on Scale-Induced Fatigue Behaviour for Railway Axle

2008 ◽  
Vol 44-46 ◽  
pp. 65-70 ◽  
Author(s):  
Yong Xiang Zhao ◽  
Bing Yang ◽  
Ming Fei Feng
Keyword(s):  
Fatigue Life ◽  
Carbon Steel ◽  
Fatigue Limit ◽  
Fatigue Behavior ◽  
Fatigue Behaviour ◽  
Railway Axle ◽  
Material Fatigue ◽  
Lz50 Steel ◽  
The Difference

Transferring of fatigue behavior is investigated from material to structure for Chinese railway LZ50 axle carbon steel. S-N data in mid-fatigue life range and fatigue limit data of smooth small specimens are applied for material fatigue behavior. Real axles and similar smooth bigger specimens were tested with respect to fatigue limits. The data of real axles reveal the difference between material and a special structure. And the data of similar specimens play a role of bridge to connect material and material structures. Probabilistic transferring relations are deduced by the data from material, to similar specimens, and then to structures at the fatigue limit phase. Structural probabilistic S-N curves are obtained by the material fatigue behavior to extend the transferring relations to entire fatigue life range. Determinations of the fatigue behavior of the groove of LZ50 steel axle indicate availability of the present investigation.

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