scholarly journals Effect of boron segregation on the surface crack of low carbon boron-bearing steel

2019 ◽  
Vol 13 ◽  
pp. 102153 ◽  
Author(s):  
Jian Sun ◽  
Hangyu Zhu ◽  
Weisheng Wang ◽  
Yongqing Duan
Keyword(s):  
Surface Crack ◽  
Bearing Steel ◽  
Low Carbon ◽  
Boron Segregation

Aluminum nitride buffer layer for diamond film growth

1996 ◽  
Vol 11 (7) ◽  
pp. 1810-1818 ◽  
Author(s):  
V. P. Godbole ◽  
J. Narayan
Keyword(s):  
Aluminum Nitride ◽  
Buffer Layer ◽  
Diamond Film ◽  
High Speed ◽  
Film Growth ◽  
High Speed Steel ◽  
Bearing Steel ◽  
Low Carbon ◽  
Wide Range ◽  
Steel Substrates

The role of aluminum nitride (AlN) as a buffer layer on the nucleation and growth of diamond on silicon and steel substrates during hot filament chemical vapor deposition (HF-CVD) has been investigated systematically. The scanning Auger electron microscopy (AES) is employed to study chemistry and content of carbon on the surface and in subsurface regions of AlN as a function of HF-CVD parameters. It is found that AlN offers an excellent diffusion barrier for carbon over a wide range of temperature and hydrocarbon content of CVD gas environment, with simultaneous inhibition of graphitization. It also facilitates nucleation of diamond phase. The surface reactions between AlN and carbon are discussed in terms of hydrogen-assisted phase transformations. We have developed a two-step procedure to obtain a continuous diamond film on steel substrates. The characteristic features of AlN have been exploited to obtain adherent and graphite-free diamond deposits on various types of steels, including low carbon steel, tool steel, high speed steel, and bearing steel.

Development of high strength hot rolled low carbon copper-bearing steel containing nanometer sized carbides

2015 ◽  
Vol 633 ◽  
pp. 1-8 ◽  
Author(s):  
M.P. Phaniraj ◽  
Young-Min Shin ◽  
Joonho Lee ◽  
Nam Hoon Goo ◽  
Dong-Ik Kim ◽  
...  
Keyword(s):  
High Strength ◽  
Bearing Steel ◽  
Low Carbon ◽  
Hot Rolled

Effects of Microstructure Transformation on Strengthening and Toughening for Heat-Treated Low Carbon Martensite Stainless Bearing Steel

2015 ◽  
Vol 817 ◽  
pp. 667-674 ◽  
Author(s):  
Xiao Hong Yuan ◽  
Mao Sheng Yang ◽  
Kun Yu Zhao
Keyword(s):  
Electron Microscope ◽  
Cryogenic Treatment ◽  
Lath Martensite ◽  
Optical Microscope ◽  
Bearing Steel ◽  
Strength Increase ◽  
Low Carbon ◽  
Packet Size ◽  
Block Width ◽  
Carbon Martensite

Microstructural transformations and mechanical properties of a low carbon martensite stainless bearing steel treated with different heat treatment parameters and cryogenic treatment (-82°C) were investigated. The function of microstructural transformations on strengthening and toughening process was quantitatively characterized as well. These analyses were performed by the optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD) and electron back scattering diffraction (EBSD) technique. The obtained results show that with execution of cryogenic treatment and tempering, the tensile strength increase owing to the reduction of retained austenite and fine carbides precipitating respectively. The effect of martensitic microstructure on yield strength increment can be regarded as packet size and block width which conform to Hall-Petch relationship. Meanwhile, the results suggest that the block width is the key structural controlling unit when analyzing the strength-structure relationship of lath martensite in low carbon martensite stainless bearing steel. In addition, packet size can be related to toughness controlling as well because of the same size as cleavage plane.

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.

The Influence of Residual Stress on Fatigue Cracking

1990 ◽  
Vol 112 (3) ◽  
pp. 199-203 ◽  
Author(s):  
A. Okamoto ◽  
H. Nakamura
Keyword(s):  
Residual Stress ◽  
Crack Growth ◽  
Surface Crack ◽  
Low Carbon Steel ◽  
Fatigue Cracking ◽  
Fatigue Tests ◽  
Power Relationship ◽  
Low Carbon ◽  
Nonlinear Stress ◽  
Inner Surface

The influence of residual stress on fatigue crack growth was experimentally and analytically investigated for surface cracks. Fatigue tests were performed on straight pipes of low-carbon steel with a circumferential inner surface crack in laboratory air environment. Some of the test pipes had been subjected to special heat treatments so as to have compressive or tensile residual stresses along inner surface. The results show that the compressive residual stress remarkably suppresses the surface crack growth, while the tensile residual stress does not accelerate the crack growth very much. The crack growth analyses were conducted by the application of power relationship between ΔK and da/dN. The stress intensity factors due to the nonlinear stress field were calculated by the weight function method. The analyses resulted in a confirmation of the behavior of the crack growth observed in the experiments.

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