Influence of Inhibition Layer on Adhesion of a Galvanized High Al Dual Phase Steel

2011 ◽  
Vol 295-297 ◽  
pp. 1669-1674
Author(s):  
Zhao Jun Deng ◽  
Jing Liu ◽  
Zhi Hong Lu ◽  
Hui Wang ◽  
Cheng Jiang Lin
Keyword(s):  
Electron Microscopy ◽  
Manganese Oxides ◽  
Dual Phase Steel ◽  
Steel Substrate ◽  
Dual Phase ◽  
Inhibition Layer ◽  
Good Adhesion ◽  
Transmission Electron ◽  
Mn Oxides ◽  
Scanning Electron

The morphology of inhibition layer and adhesion of Zn coating about a 600MPa grade high Al dual phase steel were studied by grow discharge spectrometry (GDS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that the inhibition layer is mainly composed of Fe2Al5-xZnx particles with a size of 0.5~1μm, and the adhesion is directly related to the density of the inhibition layer, the denser the inhibition layer, the better the adhesion. It is found: for the samples with good adhesion that besides the Fe2Al5-xZnx particles, there are also some small spherical Al-Mn oxides particles in sizes from 30 to 100nm uniformly distributed in the inhibition layer; for the samples with bad adhesion, the steel substrate is not fully covered by Fe2Al5-xZnx particles and large amount manganese oxides are detected at the non-covered positions.

Research on the Mechanism of Aging of Dual Phase Steel Produced by Continuous Annealing

2010 ◽  
Vol 97-101 ◽  
pp. 556-559 ◽  
Author(s):  
Hao Yu ◽  
Yong Lin Kang
Keyword(s):  
Electron Microscopy ◽  
Strain Aging ◽  
Room Temperature ◽  
Dual Phase Steel ◽  
High Strain ◽  
Continuous Annealing ◽  
Dual Phase ◽  
Transmission Electron ◽  
Aging Resistance ◽  
And Diffusion

The microstructure and properties of aging at room temperature of dual phase steel produced by continuous annealing were investigated by using mechanical property test, Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM). In order to know the mechanisms of aging of dual phase steel produced by this process, the relative theories of dissolution and diffusion of interstitials, dislocation and precipitation are proposed and discussed. From analysis, the results showed that dual phase steel produced by continuous annealing had high strain aging resistance after overaging.

scholarly journals A Simple Two-Step Process for Producing Strong and Aligned Carbon Nanotube-Polymer Composites

2019 ◽  
Vol 5 (3) ◽  
pp. 35
Author(s):  
Seyram Gbordzoe ◽  
Paa Kwasi Adusei ◽  
Devika Chauhan ◽  
Noe T. Alvarez ◽  
Mark R. Haase ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Tensile Strength ◽  
Carbon Nanotube ◽  
Thermoplastic Polyurethane ◽  
Good Adhesion ◽  
Step Process ◽  
Transmission Electron ◽  
Scanning Electron

In this paper, we present the results of a study related to fabrication of polymer-aligned carbon nanotube (CNT) composites made with different thermoplastic polymers. These composites have been manufactured by employing a simple two-step process using the internal resistive heating approach. The resulting composites have shown improved tensile strength, load, and elastic modulus compared to pristine CNT sheets. Poly (methyl methacrylate) (PMMA)-CNT, UltemTM-CNT and thermoplastic polyurethane (TPU)-CNT composites showed an increase in tensile strength by as much as 41%, 77% and 86% respectively over pristine CNT sheets. The improvement in tensile strength is the result of a good adhesion achieved between the aligned CNTs and polymer as observed with transmission electron microscopy (TEM) and scanning electron microscopy (SEM).

Effect of Reheating and End Cooling Temperature on Microstructure Refinement in a Low Carbon High Strength Nb-Ti Microalloyed Dual Phase Steel

2007 ◽  
Vol 561-565 ◽  
pp. 49-52
Author(s):  
L.D. Yao ◽  
Z.G. Li ◽  
Xing Feng Mao ◽  
Xue Li Tao ◽  
Kai Ming Wu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Grain Size ◽  
Dual Phase Steel ◽  
High Strength ◽  
Dual Phase ◽  
Low Carbon ◽  
Cooling Temperature ◽  
Microstructure Refinement ◽  
Scanning Electron

In this study, a TMCP was attempted to obtain a low carbon high strength Nb-Ti microalloyed dual phase with low yield ratio at Baosteel. Optical and scanning electron microscopy was utilized to analyze microstructures. A mixed fine microstructures consisting of acicular ferrite and martensite/austenite was observed. The austenite maintained a small grain size during reheating in the temperatures ranging from 1100°C to 1250°C. The growth of austenite was strongly retarded by Nb and Ti nitride and carbide. The higher end cooling temperature (650°C) had much influence on the refinement of microstructures, especially the length of ferrite packets, whereas the lower temperatures (600-500°C) had little effect on the microstructure refinement.

Characteristics of Hybrid Coating Deposited by PVD and PACVD Process

2014 ◽  
Vol 1036 ◽  
pp. 225-229
Author(s):  
Krzysztof Lukaszkowicz ◽  
Justyna Wiśniewska ◽  
Agnieszka Paradecka ◽  
Paulina Borylo
Keyword(s):  
Electron Microscopy ◽  
Dry Friction ◽  
Steel Substrate ◽  
Hybrid Coating ◽  
High Wear Resistance ◽  
Good Adhesion ◽  
Mechanical And Tribological Properties ◽  
Transmission Electron ◽  
The Subject ◽  
Amorphous Character

Deposited on hot work tool steel substrate coating system composed of AlTiCrN film covered by diamond-like carbon (DLC)-based lubricant, was the subject of the studies. The AlTiCrN and DLC layers were deposited by PVD lateral rotating ARC-cathodes (LARC) and PACVD technology on the X40CrMoV5-1 respectively. This paper provides an analysis of the microstructure, mechanical and tribological properties. Several surface sensitive techniques and methods, i.e. High Resolution Transmission Electron Microscopy (HRTEM), Scanning Electron Microscopy (SEM), Raman spectroscopy and ball-on-disk were used to performed study of the coating. TEM investigation shows an amorphous character of DLC layer. It was found that tested AlTiCrN layer has nanostructural character with fine crystallites. In sliding dry friction conditions the friction coefficient for the investigated elements is set in the range between 0.02-0.04. The investigated coating reveals high wear resistance. The coating demonstrated good adhesion to the substrate.

Research of the Continuous Annealing Process to Eliminate the "Band" Feature of Dual Phase Steels

2016 ◽  
Vol 867 ◽  
pp. 45-49
Author(s):  
Ji Lin Chen ◽  
Guo Hui Zhu ◽  
Jian Zhang ◽  
Yong Gang Liu ◽  
Hong Bo Pan
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Dual Phase Steel ◽  
Annealing Temperature ◽  
Annealing Process ◽  
Continuous Annealing ◽  
Dual Phase ◽  
Dual Phase Steels ◽  
Steel Sheets ◽  
Scanning Electron

A new continuous annealing process which can eliminate the "band" feature of dual phase steels has been designed. The sheets were annealed in MULTIPAS annealing simulator under variation of annealing temperature. The microstructure evolution of dual-phase steel sheets annealed at intercritical temperatures, were analyzed by optical microscopy and scanning electron microscopy. And the properties were compared with the sheets which annealed by the existing annealing process. The results show that: the "band" feature of dual-phase steel can be effectively eliminated by the optimizing continuous annealing process,and the mechanical properties are improved.

Ultrastructural Analysis of the Salivary Glands of Gromphadorhina Portentosa (Schaum)

1977 ◽  
Vol 35 ◽  
pp. 638-639
Author(s):  
P.J. Dailey
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Salivary Glands ◽  
Secretory Vesicles ◽  
The Past ◽  
Transmission Electron ◽  
Means Of Transmission ◽  
Gromphadorhina Portentosa ◽  
Scanning Electron ◽  
Topographical Relief

The structure of insect salivary glands has been extensively investigated during the past decade; however, none have attempted scanning electron microscopy (SEM) in ultrastructural examinations of these secretory organs. This study correlates fine structure by means of SEM cryofractography with that of thin-sectioned epoxy embedded material observed by means of transmission electron microscopy (TEM).Salivary glands of Gromphadorhina portentosa were excised and immediately submerged in cold (4°C) paraformaldehyde-glutaraldehyde fixative1 for 2 hr, washed and post-fixed in 1 per cent 0s04 in phosphosphate buffer (4°C for 2 hr). After ethanolic dehydration half of the samples were embedded in Epon 812 for TEM and half cryofractured and subsequently critical point dried for SEM. Dried specimens were mounted on aluminum stubs and coated with approximately 150 Å of gold in a cold sputtering apparatus.Figure 1 shows a cryofractured plane through a salivary acinus revealing topographical relief of secretory vesicles.

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