Kinetics of fracture of nodular cast iron by the method of high-speed photography

1977 ◽  
Vol 9 (12) ◽  
pp. 1462-1467
Author(s):  
I. S. Guz' ◽  
A. P. Lyubchenko ◽  
V. M. Matsevityi ◽  
S. L. Molodtsov ◽  
L. A. Smirnova
Keyword(s):  
Cast Iron ◽  
High Speed ◽  
Nodular Cast Iron ◽  
High Speed Photography ◽  
Kinetics Of

Process Optimization and Properties of Laser Cladding High Vanadium High Speed Steel Coatings on Nodular Cast Iron

2013 ◽  
Vol 712-715 ◽  
pp. 611-614 ◽  
Author(s):  
Ni Jun Xu ◽  
Jian Bin Lv ◽  
Ting Sun ◽  
Chang Sheng Liu
Keyword(s):  
Wear Resistance ◽  
Cast Iron ◽  
Laser Cladding ◽  
High Speed ◽  
High Speed Steel ◽  
Nodular Cast Iron ◽  
Vanadium Content ◽  
Treatment Technology ◽  
Metallurgical Bonding ◽  
Steel Rolls

As withstanding very high loads, thermal cycling leading to thermal fatigue, and severe environmental in the steel industry, rolls with long service life are specially required. High speed steel with high vanadium content is a newly-developed wear-resistance material that has been studied and used in some countries for making steel rolls. As a surface treatment technology, laser cladding can fabricate coating to improve the wear resistance of substrate. In this paper, the substrates for laser cladding were nodular cast iron rolls, Nd: YAG solid pulsed laser was used to explore the feasibility of preparation high vanadium high speed steel (HVHSS) coatings. The Nd: YAG laser cladding results that the coated layers combined metallurgically with the substrate with a lot of microcracks. The average microhardness up to 650 HV is more than 2 times as high as that of the substrate. After laser remelting, a fully dense and crack free HVHHS coating with an excellent metallurgical bonding was deposited. The presence of VC in the coating mainly improves the microhardness of coating up to about 650 HV.

scholarly journals Crystallization kinetics of sea-salt aerosols studied by high-speed photography

2012 ◽  
Vol 57 (6) ◽  
pp. 591-594 ◽  
Author(s):  
ZhengGang Qian ◽  
Feng Wang ◽  
YuXia Zheng ◽  
JunYing Yu ◽  
YunHong Zhang
Keyword(s):  
Crystallization Kinetics ◽  
High Speed ◽  
Sea Salt ◽  
High Speed Photography ◽  
Sea Salt Aerosols ◽  
Kinetics Of

Process Optimization and Properties of Laser Cladding High Speed Steel Coatings on Nodular Cast Iron

2011 ◽  
Vol 418-420 ◽  
pp. 1527-1530
Author(s):  
Jian Bin Lv ◽  
Zheng Yi Wang ◽  
Xue Wei Wang ◽  
Chang Sheng Liu
Keyword(s):  
Wear Resistance ◽  
Cast Iron ◽  
Laser Cladding ◽  
High Speed ◽  
Continuous Wave ◽  
High Speed Steel ◽  
Nodular Cast Iron ◽  
Wear Property ◽  
Treatment Technology ◽  
Red Hardness

Rolls in the steel industry withstand very high loads, thermal cycling leading to thermal fatigue, and severe environmental. How to improve the wear resistance and elongate the service life of rolls matters a lot in reducing the consumption of rolls. In recent years, because of its better red-hardness and wear property, high speed steel (HSS) was used to manufacture the new type composite rolls. As a surface treatment technology, laser cladding can fabricate coating to improve the wear resistance of substrate. In this paper, the substrates for laser cladding were nodular cast iron rolls, Nd:YAG solid pulsed laser and continuous wave CO2laser were both used to explore the feasibility of preparation HSS coatings. The Nd:YAG laser cladding results that the coated layers combined metallurgically with the substrate with a lot of microcracks. The average microhardness up to 600 HV is about 2 times as high as that of the substrate. The CO2laser cladding results that: fully dense and crack free clad surfaces of high speed steel with an excellent metallurgical bonding were deposited. The average microhardness up to 900 HV is about 3 times as high as that of the substrate. The high-temperature (500 °C) wear rate is 40% of nodular cast iron’s in 30 min.

The Influence of Temperature on The Kinetics of Cut Growth in Vulcanizates

1959 ◽  
Vol 32 (3) ◽  
pp. 692-695 ◽  
Author(s):  
V. E. Gul ◽  
S. A. Vilnits
Keyword(s):  
High Speed ◽  
Glassy State ◽  
High Speed Photography ◽  
Influence Of Temperature ◽  
Brittle Solids ◽  
Significant Difference ◽  
Elastomeric Materials ◽  
Influence Of Temperature On ◽  
Published Research ◽  
Kinetics Of

Abstract Recently published research has conclusively demonstrated that rupture in vulcanizates represents a process which increases with time. Slow and fast stages of rupture were discerned. Through the use of high speed photography it was found that, in the usual testing of tensile strength, the rate of rupture growth is initially very small but then quickly although intermittently increases. This behavior occurred both in the rupture of specimens which were not cut and in testing specimens that had been previously cut. The effect of a cut has been thoroughly investigated. Studies conducted on the mechanism of rupture in elastomers indicate that the rupture of vulcanizates has much in common with that of brittle solids. Nevertheless there is a significant difference in the mechanism of rupture in elastomeric materials and brittle solids. It was natural, therefore, to expect a significant change in the kinetics of rupture growth in the region of the glass transition temperature. The aim of the present investigation was to follow the change in the kinetics of rupture of vulcanizates through the transition from the rubbery to the glassy state.

scholarly journals Continuous Cooling Transformation (CCT) Diagrams Of Carbidic Nodular Cast Iron

2015 ◽  
Vol 60 (2) ◽  
pp. 705-710 ◽  
Author(s):  
G. Gumienny ◽  
T. Giętka
Keyword(s):  
Cast Iron ◽  
Chemical Composition ◽  
Nodular Cast Iron ◽  
Lower Bainite ◽  
Continuous Cooling Transformation ◽  
Continuous Cooling ◽  
Upper Bainite ◽  
Transformation Diagrams ◽  
Cct Diagrams ◽  
Kinetics Of

Abstract This work presents continuous cooling transformation diagrams for different kinds of carbidic nodular cast iron. We investigated the cast iron, chemical composition of which in nodular cast iron allows the obtainment of a metal matrix which consists of: pearlite, upper bainite and its mixture with lower bainite, ausferrite and martensite when the casts were cooled in the mold. The influence of the rate of cooling on the obtained microstructure and hardness of the casts was shown. The work describes the influence of the alloy additives on the curves of austenite decomposition in the carbidic nodular cast iron. Diagrams were plotted which enable an understanding of the kinetics of the transformations of austenite in carbidic nodular cast iron. The diagrams also indicate the possibility of obtaining pearlite, bainite, martensite and ausferrite with the established chemical composition and the wall thickness of the cast.

scholarly journals Tool Wear in High Speed Turning of Nodular Cast Iron.

1997 ◽  
Vol 44 (12) ◽  
pp. 1151-1156 ◽  
Author(s):  
Shinsaku Hanasaki ◽  
Junsuke Fujiwara ◽  
Tadahiro Wada ◽  
Masanori Yosutomi
Keyword(s):  
Cast Iron ◽  
Tool Wear ◽  
High Speed ◽  
Nodular Cast Iron ◽  
High Speed Turning
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