Effect of Nitrogen on Mechanical Properties of 20MnSi at High Temperature

2011 ◽  
Vol 194-196 ◽  
pp. 213-217
Author(s):  
Ji Chun Yang ◽  
Nan Liu
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Tensile Test ◽  
Grain Boundaries ◽  
Grain Refinement ◽  
Sem And Tem ◽  
Mechanical Tensile

The effect of nitrogen on the mechanical properties of 20MnSi steel at high temperature was investigated. Mechanical tensile test was conducted using a Gleeble-1500D. Microstructure and fractograms were analyzed using SEM and TEM. The results indicate that nitrogen in concentration of 0.4 ~ 0.6% improves the grain boundaries and grain refinement, and thus the strength and section shrinkage and plasticity of the steel. Further increase in concentration of nitrogen has little effect on section shrinkage.

Lattice Imaging of Grain Boundaries in Ceramics

1977 ◽  
Vol 35 ◽  
pp. 114-115
Author(s):  
D. R. Clarke ◽  
G. Thomas
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Silicon Nitride ◽  
Grain Boundaries ◽  
High Temperature Strength ◽  
Current Interest ◽  
Lattice Imaging ◽  
Special Significance ◽  
Structural Applications ◽  
Refractory Ceramics

Grain boundaries have long held a special significance to ceramicists. In part, this has been because it has been impossible until now to actually observe the boundaries themselves. Just as important, however, is the fact that the grain boundaries and their environs have a determing influence on both the mechanisms by which powder compaction occurs during fabrication, and on the overall mechanical properties of the material. One area where the grain boundary plays a particularly important role is in the high temperature strength of hot-pressed ceramics. This is a subject of current interest as extensive efforts are being made to develop ceramics, such as silicon nitride alloys, for high temperature structural applications. In this presentation we describe how the techniques of lattice fringe imaging have made it possible to study the grain boundaries in a number of refractory ceramics, and illustrate some of the findings.

The Effect of Microalloying B on the High Temperature Mechanical Properties of Ti3Al

1988 ◽  
Vol 133 ◽  
Author(s):  
Joseph W. Newkirk ◽  
Gerald B. Feldewerth
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Tensile Properties ◽  
Grain Refinement ◽  
High Temperature Mechanical Properties ◽  
High Temperature Tensile ◽  
High Temperature Tensile Properties

ABSTRACTThe effect of adding boron to Ti3Al on the microstructure and high temperature tensile properties has been studied. Boron caused a large grain refinement that dominated the tensile properties at all temperatures. Particles of Ti2B were found in all of the boron containing alloys. TiB was found only at concentrations of 0.1% B or more.

Development of the 600MPa High Aluminum Galvanized Dual Phase Steel and its Application

2011 ◽  
Vol 228-229 ◽  
pp. 1169-1173
Author(s):  
Hui Wang ◽  
Cheng Jiang Lin ◽  
Zhao Jun Deng ◽  
Peng Yang ◽  
Fei Yan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Test ◽  
Grain Boundaries ◽  
Retained Austenite ◽  
Dual Phase Steel ◽  
Dual Phase ◽  
Bake Hardening ◽  
Tem Analysis ◽  
Auto Parts ◽  
High Aluminum

An original 600MPa high aluminum galvanized dual phase steel had been successfully developed in this paper. The microstructure analysis showed that the microstructures of the steel mainly consist of ferrite and 8%~11% martensite as well as 4%~6% retained austenite which distributed around the ferrite grain boundaries. TEM analysis demonstrated that there exists lots of high density dislocation in ferrite, obvious twin-structures in martensite and some retained austenite in the microstructures. The existence of the retained austenite makes some contribution to the higher elongation of the steel. The tensile test showed that the steel delivers an excellent mechanical properties of Rp0.2=350~400MPa,Rm=610~650MPa, A80mm=26%~30%, n=0.17~0.21 and an excellent bake-hardening value of 50~70MPa. Ball-Punch Experiments showed that the galvanizing dual phase steel had a good and satisfying coating adhesion. Owe to the excellent formability, the steel has successfully been used in the production of some auto parts.

Effect of RE on Microstructure and Properties of AM60 Magnesium Alloy

2014 ◽  
Vol 1004-1005 ◽  
pp. 172-176
Author(s):  
Yao Li ◽  
Jun Jie Yang ◽  
Ping Xue ◽  
Zhi Jiang Zuo
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Rare Earth ◽  
Magnesium Alloy ◽  
Grain Boundaries ◽  
Grain Refinement ◽  
Network Structure ◽  
Microscopic Analysis ◽  
Elongation Rate ◽  
Mg17al12 Phase

Industrial AM60 magnesium alloy, to which mixed rare earth containing Y, Gd and Nd elements is added, was used to study the effects of rare earth (RE) on their casting microstructures and properties. The experimental results showed that RE could effectively improve grain refinement and the internal organization, which transferred the Mg17Al12 phase from the network structure into grainy one. The microscopic analysis indicated that by adding the mixed RE, the amount of Mg17Al12 compounds was less than that without mixed RE on the grain boundaries, and it was replaced by Al-RE compounds. In addition, the mechanical properties of the alloy with mixed RE had been significantly improved and the maximum tensile strength was up to about 260MPa and the elongation rate could reach more than 10%. When the mixed RE content was more than 2%, coarse Al-RE compounds were formed in the alloy, which degraded the mechanical properties.

Oxide Layers Mechanical Properties for Ni Base Alloys in HTR Environment

2008 ◽  
Vol 595-598 ◽  
pp. 501-509
Author(s):  
Damien Kaczorowski ◽  
Gouenou Girardin ◽  
S. Chamousset
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Heat Exchanger ◽  
Tensile Test ◽  
Oxide Layers ◽  
Intermediate Heat Exchanger ◽  
Nickel Base ◽  
Very High ◽  
High Temperature Gas

Nickel base alloys 617 and 230 are promising candidates for the Intermediate Heat eXchanger (IHX) of GenIV Very High Temperature gas cooled Reactors. The capability to maintain an oxide layer as an efficient barrier against corrosion under mechanical loading is investigated through SEM in situ tensile test. The mechanical properties of external oxide layers are so compared between the two alloys. Cracks and spallation are observed. Few differences could be observed between these two alloys when pre oxidized in impure helium.

Effects of Rare Earth Oxides on Microstructures and Properties of Magnesia Refractories

2008 ◽  
Vol 368-372 ◽  
pp. 1158-1160 ◽  
Author(s):  
Bao Guo Zhang ◽  
Zhou Fu Wang ◽  
Shao Wei Zhang ◽  
Xi Tang Wang ◽  
Zi Wei Xu
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Rare Earth ◽  
High Temperature ◽  
Mechanical Strength ◽  
Grain Boundaries ◽  
Bulk Density ◽  
Rare Earth Oxide ◽  
Rare Earth Oxides ◽  
Microstructure And Mechanical Properties

The effects of Y2O3, La2O3 and Nd2O3 on the sintering, microstructure and mechanical properties of magnesia refractories were investigated. Addition of rare earth oxide (ReO) to magnesia refractories increases the bulk density, decreases the porosity and improves the mechanical strength of the refractories. The improved sinterability was attributable to the vacancies generation associated with the solid-solution reactions between MgO and ReO. In the samples with ReO, rare earth silicate phases form at magnesia grain boundaries, providing additional bonding between magnesia grains and between magnesia grains and matrix. Consequently, the samples with ReO showed much higher high temperature strengths than those without ReO.

Effect of Sb, Sn and Pb Additions on the Microstructure and Mechanical Properties of AZ91 Alloy

2015 ◽  
Vol 830-831 ◽  
pp. 375-378 ◽  
Author(s):  
Arun Boby ◽  
Amirthalingam Srinivasan ◽  
Uma Thanu Subramonia Pillai ◽  
Bellambettu Chandrasekhara Pai
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Tensile Properties ◽  
Grain Refinement ◽  
Az91 Alloy ◽  
Precipitation Sequence ◽  
Microstructure And Mechanical Properties ◽  
High Temperature Tensile ◽  
High Temperature Tensile Properties

This article presents the effect of individual addition of Sb, Sn and Pb on the precipitation sequence at room as well as high temperature tensile properties of AZ91 alloy. The results show grain refinement, formation of Mg3Sb2 and Mg2Sn phases when Sb and Sn are added to AZ91 alloy. Lamellar precipitate is significantly suppressed while Pb added. Improved room and high temperature tensile properties are observed in Sb and Sn addition. Maximum tensile properties are noticed with AZ91 alloy having 0.5 wt.% Sb addition.

scholarly journals Destructive Testing of Wood Plastic Composite

2019 ◽  
Vol 57 (2) ◽  
pp. 208-214
Author(s):  
Zuzana Mitalova ◽  
Juliana Litecka ◽  
Dusan Mital ◽  
Marta Harnicarova ◽  
Jan Valicek ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Tensile Test ◽  
Low Cost ◽  
Natural Fibres ◽  
Bending Test ◽  
Low Density ◽  
Wood Plastic Composite ◽  
Destructive Testing ◽  
Plastic Composite

The paper deals with destructive testing of �new� group of material - Wood Plastic Composite (in short WPC). WPC emerging from a fusion of two different kinds of components - thermoplastics matrix and natural reinforcement (fibres or flour). Natural fibres offer several advantages - they are renewable, inexpensive, low-density, good isolate a sound and low cost. These components are mixed under the influence of high temperature and then pressed to make various shapes. This material contains cracks localized on the interface between the wood and plastic. These cracks occurred due to inhomogeneity of WPC and affected mechanical properties of final WPC product. The testing of mechanical properties (tensile test and bending test) were determinate in VUHZ Dobra (Ostrava) - following the ISO standards. Significant differences between mechanical properties after testing were caused by non-perfect encapsulation between components and non-homogeneity of materials.

An Investigation on Duplex Nucleation in AZ91 Magnesium Alloy and Its Influence on High Temperature Mechanical Properties

2018 ◽  
Vol 140 (4) ◽  
Author(s):  
A. Saber ◽  
R. Haghayeghi ◽  
H. Najafi ◽  
Peiman Shahbeigi-Roodposhti
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Grain Refinement ◽  
Al Alloy ◽  
Grain Refiner ◽  
Az91 Magnesium Alloy ◽  
High Temperature Mechanical Properties ◽  
Nucleation Sites ◽  
Refinement Mechanism ◽  
Carbon Inoculation

The grain refinement of Mg–Al alloy AZ91 via carbon inoculation, including the significant role of Mn in advanced nucleation, was analyzed, and the corresponding mechanical properties and aging behavior were investigated. To this end, various amounts of C were added into the liquid at the desired temperatures. Al8Mn5 particles, which are suitable nucleation sites for α-Mg, were identified as the primary grain refiners. In situ particle formation, along with appropriate wetting and a suitable orientation relationship (OR), facilitated the grain refinement mechanism. Al4C3 particles contributed to heterogeneous nucleation by providing suitable Al8Mn5 nucleation sites. Mn removal resulted in poor grain refinement in the Mg–Al alloy. The Hall–Petch relationship, high-temperature tensile behavior, and aging mechanism of the samples refined by 1 wt % C addition (as the best grain refiner) are discussed and compared with industrial practice.

Analysis of the Fundamental Mechanisms and Efficiency of the Deformation Methods of Nanostructuring

2008 ◽  
Vol 584-586 ◽  
pp. 29-34 ◽  
Author(s):  
Radik R. Mulyukov ◽  
Ayrat A. Nazarov ◽  
Renat M. Imayev
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
High Pressure ◽  
High Temperature ◽  
Severe Plastic Deformation ◽  
Grain Refinement ◽  
Equal Channel Angular Pressing ◽  
Efficient Method ◽  
High Pressure Torsion ◽  
Angular Pressing

Deformation methods of nanostructuring (DMNs) of materials are proposed to classify into severe plastic deformation (SPD) and mild plastic deformation (MPD) methods according to fundamentally different low- and high-temperature grain refinement mechanisms they exploit. A general analysis of the fundamentals and nanostructuring efficiency of three most developed DMNs, high pressure torsion (HPT), equal-channel angular pressing (ECAP), and multiple isothermal forging (MIF) is done with a particular attention to ECAP and MIF. It is demonstrated that MIF is the most efficient method of DMNs allowing one to obtain the bulkiest nanostructured samples with enhanced mechanical properties.

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