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Online since: May 2016
Authors: Maxim Yu. Matrosov, Oleg N. Sychev, Andrey M. Korchagin, Oleg P. Talanov
For steels, working in sour environment, manufacturers have to provide not only required set of mechanical properties but also the additional requirements to resistance to HIC (hydrogen induced cracking) [1] and/in some cases, to SSCC (sulfur stress corrosion cracking) [2].
External factors, affecting the resistance to SSCC are: H2S and CO2 concentration in media, partial pressure, pH value, time, temperature, tensile stress.
Internal factors are following: steel chemical composition, number and shape of non-metallic inclusions, microstructure of steel, strength properties [3, 4, 9-13].
Medium-size precipitates of carbonitrides, TEM, bright field, a – × 30000, b – × 15000 Comparison of results of corrosion tests and microstructure examination allows coming to the conclusion, that unfavorable factors, affecting both HIC and SSCC resistance of steel, were minimized by application of developed production schedules.
Factors in sulfide corrosion cracking of high strengthsteels. – Corrosion, 1968, v.24, №2, p.31-37
Online since: January 2012
Authors: Osamu Umezawa, Fu Xing Yin, Qian Feng Fang, H. Lu, Chun Xia Li
The dipole shape factor dl relates closely not only to the properties of interstitial atoms but also to the alloys properties such as lattice constant and elastic modulus [5].
The dipole shape factors dl of Ti-Nb-O alloys were deduced from the experimental data as 0.406 for the randomly orientated polycrystalline Ti-25Nb-(0.16-3.1)O alloys [4] and as 0.42 for the highly textured Ti–25.2Nb–0.6O alloy [3].
This suggests that other key parameters in addition to the lattice constant also affect dl greatly.
(1) The dipole shape factors (dl) of the oxygen Snoek-type relaxation were figured out for the Ti-Nb-X (X = Al, Sn, Cr, Mn, Fe) ternary alloys.
(2) The dipole shape factor was affected by the lattice constant of the alloy and the e/a.
Online since: November 2014
Authors: Wei Ping Bao, Fu Ming Wang, Zhi Ping Xiong, Jian Shu, Xue Ping Ren
Results Dynamic Mechanical Properties The strain rate affects dynamic mechanical behaviors of pure iron and TWIP steel.
Conclusions The dynamic mechanical properties and microstructures of pure iron and Fe-30Mn-3Si-4Al TWIP steel were investigated by SHPB and TEM.
Walley, High strain rate properties of metals and alloys, Int.
Qu, Dynamic mechanical properties of the Fe–30Mn–3Si–4Al TWIP steel after different heat treatments, Mater.
Qu, Effect of high temperatures and high strain rates on dynamic mechanical properties of Fe-30Mn-3Si-4Al TWIP steel, Int.
Online since: January 2012
Authors: Sheng Bao Wang, Jun Feng Su
In addition, these microPCMs possess properties of thermal stability, high mechanical strength and high surface area during a thermal transmission process.
It can be imaged that the encapsulated PCMs characteristics, microPCMs shell properties (thickness, intension and average diameter), matrix and the interfacial adhesion structures (microPCMs and matrix) are four main factors affecting the interfacial stability of microPCMs/polymer composites.
The microPCMs with MMF shells have enough mechanical properties to resist the internal stress.
And these interface changes will affect the mechanical properties of these microPCMs/polymer composite in application.
Wang: Preparation and mechanical properties of thermal energy storage microcapsules.
Online since: June 2009
Authors: Jian Wu Yu, Peng Xiao, Yu Shan Liao, Min Cheng
Effect of discharge energy and material properties on surface integrity are presented in this paper.
It features excellent mechanical properties, such as high durability in high strength applications with moderate temperatures, excellent strength-to-weight ratio, excellent corrosion resistance and excellent fatigue properties etc.
The mechanical properties of Ti-6Al-4V are shown in Table 1 [1].
These physical, chemical or mechanical properties lead to that titanium alloy is a kind of difficult-to-machine materials by traditional machining methods [3-6].
The region affected by these thermal changes is referred to as the heat-affected zone (HAZ).
Online since: December 2010
Authors: Jun Feng Su, Wen Long Xia, Shan Shan Wang
In general, similar to other protein (wheat, corn) films, SPI films provide lower mechanical properties and higher moisture sensitivity.
Moreover, literature [2] has confirmed that SPI films without other secondary components do not show good mechanical and barrier properties.
These blend films showed enhanced mechanical properties comparing to pure SPI films.
As a kind of protein-based packaging film, it is well known that the appearance, moisture sensitivity and mechanical properties will be important characters greatly affecting consumer acceptance of such protein-based films.
These results indicated that the color was greatly affected by the factors of pH value, cross-linkage degree, plasticizer addition, thermal treatment, fabrication process and weight contents of blends [6].
Online since: December 2010
Authors: Yung Ting Alex Tuan, Chun Ying Huang, Chao Hsun Huang
In this equation, factors that affect the seismic response of the equipment such as the ductility, resonance, site, and relative height effects are all taken into account.
However, as the dynamic property of equipment varies, the ap values given in Table 1 might not represent the correct response.
It can be seen that the component amplification factors do vary for different equipments instead of stay at the lower and upper bound of 1.0 and 2.5, as specified in Table 2.
On the other hand, these factors, when normalized by multiplying 0.4SDS, are comparable to the spectral acceleration SaD specified by the code.
The average component amplification factors for all four types of equipments are comparable to the spectral acceleration SaD specified by the code when normalized with respect to the PGA.
Online since: December 2014
Authors: Mahmoud M. Tash, Saleh A. Alkahtani, Khaled A. Abuhasel
The effect of hot rolling and hot forging with different reduction ratios on the hardness and impact toughness properties will be studied.
An understanding of the combined effect of TMT and heat treatment on the hardness and impact toughness of the low alloy steels would help in selecting conditions required to achieve optimum mechanical properties and alloy high strength to weight ratio.
Introduction Hot work provides the driving force for microstructural change and improves physical and mechanical properties.
Tempering reduces brittleness imparted by hardening and produces definite physical properties within the steel.
Effect of vanadium and titanium modifi- cation on the microstructure and mechanical properties of microalloyed HSLA steel.
Online since: June 2012
Authors: Feng Qing Zhao, Yan Mu, Ying Li Fu
Various factors on gypsum block were investigated.
The prepared gypsum block possesses excellent water-resistance, good operating property and high mechanical strength.
The physical and mechanical properties of calcined gypsum were shown in Table 1.
Table 1 The physical and mechanical properties of calcined gypsum Setting time 2h bending strength, MPa 2h compressive strength, MPa Softening coefficient Water absorption rate, % Initial setting time, min.
The main factors to affect the water resistance of gypsum block were the water resistance agent KD-3, foam and curing regime etc.
Online since: September 2013
Authors: Jiu Yin Pang, Shi Cheng Zhang, Zhen Guo Gao
The density of these factors, the board, hot pressing process (pressure, temperature and time), sizing amount, analysing and sizing amount proportion factor is particularly important, the veneer of straw composite board research, i.e., according to the ratio of glue and adhesive two factors as variable factor are studied.
This chapter will be divided into two parts to discuss the above factors affect the performance of plate.
The density is an important factor to affect the veneer straw composite plate bending performance.
Obviously, the density increases to enhance the flexural properties of the composite panels.
Figures 1-4 clearly show, the plate MOR significant increase in flexural properties of the composite plate also increases with increasing density.
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