The Experts below are selected from a list of 291042 Experts worldwide ranked by ideXlab platform
Wang Lian-jun - One of the best experts on this subject based on the ideXlab platform.
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Research into the Comparison between Geopolymer Solidification Fly Ash and Cement Solidification Fly Ash
Bulletin of the Chinese ceramic society, 2008Co-Authors: Wang Lian-junAbstract:Chemical composition of fly ash has been analyzed.Experiments have been performed to analyze the effect of cement Solidification with fly ash and geopolymer Solidification with fly ash.The result shows that the main elements of fly ash was Ca、Cl、Si、Al、K、S and Na,and many heavy metals such as Zn、Pb、Cu、Cd and Cr can be found in fly ash.At the same conditions,the compressive strength of geopolymer Solidification with fly ash is higher than cement Solidification with fly ash.Geopolymer Solidification with fly ash has high early compressive strength.The leaching toxicity of heavy metals after Solidification was generally lower than that of the national standard.
J.m. Vitek - One of the best experts on this subject based on the ideXlab platform.
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Correlation between Solidification parameters and weld microstructures
International Materials Reviews, 2013Co-Authors: Stan A David, J.m. VitekAbstract:AbstractSolidification behaviour controls the size and shape of grains, the microstructure, the extent of segregation, the distribution of inclusions, the extent of defects such as porosity and hot cracks, and ultimately the properties of weld metal. In the past, theories related to single crystal growth technology and the Solidification of castings have been extrapolated to describe weld metal Solidification. However, within the past two decades there have been several new developments in Solidification theory. Furthermore, welding involving high energy beam processes and significantly greater cooling rates have received much emphasis. Traditional Solidification theories as they apply to castings are not appropriate in describing Solidification under these latter conditions. This paper provides a comprehensive review of the Solidification behaviour of a weld pool incorporating recent advances in Solidification theories. Basic principles from ingot, single crystal, and rapid Solidification processes are u...
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Weld pool Solidification and microstructures
1991Co-Authors: Stan A David, J.m. VitekAbstract:Solidification behavior controls the size and shape of grains, the rate and extent of segregation, the distribution of inclusions, the extent of defects such as porosity and hot-cracking, and, ultimately, the properties of weld metal. In the past, theories related to single crystal growth technology and castings have been extrapolated to describe weld metal Solidification. However within the last two decades there have been several new developments in Solidification theory. The paper will address the Solidification behavior of a weld pool, incorporating recent advances in Solidification theories. Basic principles from ingot, single crystal, and rapid Solidification processes will be used to understand and explain observed weld metal microstructures. Finally, and most importantly, Solidification parameters that control weld pool Solidification such as temperature gradient and growth rate and the resultant undercooling have been correlated with weld metal microstructure. 61 refs., 13 figs.
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Analysis of weld metal Solidification and microstructures
1991Co-Authors: Stan A David, J.m. VitekAbstract:Solidification is a critical phase change occurring during welding that controls weld metal microstructure, properties, and ultimately weldability of alloys. In recent years, significant advances have been made in the Solidification theories that relate to castings and rapidly solidified materials. A critical need exists to understand weld pool Solidification in the light of these new theories. This paper will describe the Solidification behavior of weld pools, incorporating some recent advances in Solidification theories. Basic principles from ingot, single crystal, and rapid Solidification processes will be used to understand and explain observed weld-metal microstructures. 62 refs., 12 figs.
Yucheng Lei - One of the best experts on this subject based on the ideXlab platform.
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A New Test Method for Evaluation of Solidification Cracking Susceptibility of Stainless Steel during Laser Welding.
Materials, 2020Co-Authors: Wenbin Wang, Li Xiong, Dan Wang, Yucheng LeiAbstract:A new test method named “Trapezoidal hot” cracking test was developed to evaluate Solidification cracking susceptibility of stainless steel during laser welding. The new test method was used to obtain the Solidification cracking directly, and the Solidification cracking susceptibility could be evaluated by the Solidification cracking rate, defined as the ratio of the Solidification cracking length to the weld bead length under certain conditions. The results show that with the increase in the Solidification cracking rate, the Solidification cracking susceptibility of SUS310 stainless steel was much higher than that of SUS316 and SUS304 stainless steels during laser welding (at a welding speed of 1.0 m/min) because a fully austenite structure appeared in the weld joint of the former steel, while the others were ferrite and austenitic mixed structures during Solidification. Besides, with an increase in welding speed from 1.0 to 2.0 m/min during laser welding, the Solidification cracking susceptibility of SUS310 stainless steel decreased slightly; however, there was a tendency towards an increase in the Solidification cracking susceptibility of SUS304 stainless steel due to the decrease in the amount of ferrite under a higher cooling rate.
H. Mori - One of the best experts on this subject based on the ideXlab platform.
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Hot cracking susceptibility in laser weld metal of high nitrogen stainless steels
Science and Technology of Advanced Materials, 2004Co-Authors: K. Nishimoto, H. MoriAbstract:High nitrogen stainless steels are used as structural materials required to possess high strength and fracture toughness at low temperatures. The Solidification mode in weld metals of stainless steels is generally designed to be the primary ferrite Solidification mode to prevent hot cracking. The weld metals in some high nitrogen stainless steels, however, exhibit the primary austenite Solidification mode because of an austenitizing effect of nitrogen, which enhances hot cracking susceptibility. In addition, laser welding provides the primary austenite Solidification mode in weld metals of stainless steels due to the high Solidification rate. Therefore, the laser weld metal of high nitrogen stainless steels likely occurs hot cracking.This study was conducted to make clear an effect of nitrogen and the Solidification rate on hot cracking susceptibility in the laser weld metals of type 304 stainless steels varied with nitrogen content. The hot cracking susceptibility was examined by the preloading tensile strain (PLTS) cracking test. The PLTS test results showed that hot cracking susceptibility was remarkably increased with increase in the Solidification rate and the nitrogen content. On the other hand, the Solidification mode in the weld metal was changed from the primary ferrite to the primary austenite, as the Solidification rate was raised. The primary austenite Solidification mode was also observed in the weld metals with higher nitrogen content at lower Solidification rate conditions. The experimental results indicated that the increase in hot cracking susceptibility is in agreement with the transition of Solidification mode from the primary ferrite to the primary austenite in the weld metal. The transition of Solidification mode in the weld metals of high nitrogen stainless steels could be predicted by the calculation using the modified Kurz–Giovanola–Trivedi model considering the effect of nitrogen.
Stan A David - One of the best experts on this subject based on the ideXlab platform.
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Correlation between Solidification parameters and weld microstructures
International Materials Reviews, 2013Co-Authors: Stan A David, J.m. VitekAbstract:AbstractSolidification behaviour controls the size and shape of grains, the microstructure, the extent of segregation, the distribution of inclusions, the extent of defects such as porosity and hot cracks, and ultimately the properties of weld metal. In the past, theories related to single crystal growth technology and the Solidification of castings have been extrapolated to describe weld metal Solidification. However, within the past two decades there have been several new developments in Solidification theory. Furthermore, welding involving high energy beam processes and significantly greater cooling rates have received much emphasis. Traditional Solidification theories as they apply to castings are not appropriate in describing Solidification under these latter conditions. This paper provides a comprehensive review of the Solidification behaviour of a weld pool incorporating recent advances in Solidification theories. Basic principles from ingot, single crystal, and rapid Solidification processes are u...
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Weld pool Solidification and microstructures
1991Co-Authors: Stan A David, J.m. VitekAbstract:Solidification behavior controls the size and shape of grains, the rate and extent of segregation, the distribution of inclusions, the extent of defects such as porosity and hot-cracking, and, ultimately, the properties of weld metal. In the past, theories related to single crystal growth technology and castings have been extrapolated to describe weld metal Solidification. However within the last two decades there have been several new developments in Solidification theory. The paper will address the Solidification behavior of a weld pool, incorporating recent advances in Solidification theories. Basic principles from ingot, single crystal, and rapid Solidification processes will be used to understand and explain observed weld metal microstructures. Finally, and most importantly, Solidification parameters that control weld pool Solidification such as temperature gradient and growth rate and the resultant undercooling have been correlated with weld metal microstructure. 61 refs., 13 figs.
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Analysis of weld metal Solidification and microstructures
1991Co-Authors: Stan A David, J.m. VitekAbstract:Solidification is a critical phase change occurring during welding that controls weld metal microstructure, properties, and ultimately weldability of alloys. In recent years, significant advances have been made in the Solidification theories that relate to castings and rapidly solidified materials. A critical need exists to understand weld pool Solidification in the light of these new theories. This paper will describe the Solidification behavior of weld pools, incorporating some recent advances in Solidification theories. Basic principles from ingot, single crystal, and rapid Solidification processes will be used to understand and explain observed weld-metal microstructures. 62 refs., 12 figs.