Continuous Cooling Curves Diagrams of Propene/Ethylene Random Copolymers. The Role of Ethylene Counits in Mesophase Development

2010 ◽  
Vol 43 (6) ◽  
pp. 2890-2896 ◽  
Author(s):  
Dario Cavallo ◽  
Fiorenza Azzurri ◽  
Roberto Floris ◽  
Giovanni C. Alfonso ◽  
Luigi Balzano ◽  
...  
Keyword(s):  
Random Copolymers ◽  
Cooling Curves ◽  
Continuous Cooling

Martensite Phase Transform during Nitrogen-Spray Water Jet Quenching

2013 ◽  
Vol 750-752 ◽  
pp. 442-445
Author(s):  
Li Feng Wang ◽  
Bao Dong Shao ◽  
He Ming Cheng ◽  
Chong Tian
Keyword(s):  
Alloy Steel ◽  
Martensite Phase ◽  
Water Jet ◽  
Jet Quenching ◽  
Water Quenching ◽  
Cooling Curves ◽  
Mixture Ratio ◽  
Continuous Cooling ◽  
Phase Transform ◽  
Cooling Velocity

Nitrogen-spray water jet quenching is a new kind of quenching, whose cooling velocity can be controlled. Thus different phase can be achieved according requirement, which can improve the characteristic of material. 9SiCr alloy steel was tested during Nitrogen-spray water jet quenching. The continuous cooling curves of 9SiCr under mixture of Nitrogen-spray water quenching for different pressure and mixture ratio of Nitrogen and spray water are obtained. After quenching, the metallographic structures were investigated, in which the uniform martensite was obtained after quenching.

The Role of Polymer Architecture in Strengthening Polymer−Polymer Interfaces:  A Comparison of Graft, Block, and Random Copolymers Containing Hydrogen-Bonding Moieties

1998 ◽  
Vol 31 (4) ◽  
pp. 1292-1304 ◽  
Author(s):  
Brian D. Edgecombe ◽  
Jason A. Stein ◽  
Jean M. J. Fréchet ◽  
Zhihua Xu ◽  
Edward J. Kramer
Keyword(s):  
Hydrogen Bonding ◽  
Random Copolymers ◽  
Polymer Interfaces ◽  
Polymer Architecture

The Role of Copolymer Architecture on the Interfacial Structure of a Ternary Polymer Blend

1996 ◽  
Vol 461 ◽  
Author(s):  
M. D. Dadmun
Keyword(s):  
Monte Carlo Simulation ◽  
Polymer Blend ◽  
Experimental Studies ◽  
Interfacial Structure ◽  
Random Copolymers ◽  
Random Structure ◽  
Sequence Distribution ◽  
Ternary Polymer ◽  
Interfacial Characteristics

ABSTRACTThe role of copolymer sequence distribution on the interfacial characteristics of a ternary polymer blend containing 2 homopoiymers and a copolymer in the phase separated state are examined using Monte Carlo Simulation. The copolymer does migrate to the biphasic interface in the phase separated regime while the configuration and expansion of the copolymer at the interface is a function of sequence distribution within the copolymer. This effect is interpreted in terms of the efficiency of the copolymer to strengthen the biphasic interface. These results suggest that block, alternating, and block-ran structures show promise as interfacial modifiers, while the purely random and alt-ran copolymers will be less efficient as an interfacial strengthener. It is also found that a variation of the sequence distribution away from a purely random structure can dramatically effect the ability of the copolymer to modify the interface. As most polymers which are not block nor alternating are termed ‘random’, this differentiation may have an effect on experimental studies of ‘random’ copolymers as compatibilizers in polymer blends.

The Role of Continuous Cooling Transformation Diagrams in Material Design for High Strength Oil and Gas Transmission Pipeline Steels

2006 ◽  
Author(s):  
Douglas G. Stalheim ◽  
Govindarajan Muralidharan
Keyword(s):  
Oil And Gas ◽  
Alloy Composition ◽  
Processing Route ◽  
Continuous Cooling Transformation ◽  
Continuous Cooling ◽  
Effective Manner ◽  
Final Microstructure ◽  
Cct Diagrams ◽  
Transmission Pipelines

The economical, environmental, and safe movement of gas and oil to the marketplace requires transmission pipelines to be designed to operate at higher pressures and/or with improved toughness over a variety of temperature ranges. To meet the higher strength and toughness specification requirements of these transmission pipelines, appropriate materials and processes must be used in their design and construction. This includes selection of appropriate alloy composition, processing routes, microstructure control, and cost. A continuous cooling transformation (CCT) diagram is a tool that can be used to select alloy composition and processing route in order to obtain a specific, desirable microstructure for transmission linepipe steels in a cost-effective manner. In the past, CCT diagrams were developed experimentally under laboratory conditions, thus requiring extensive time and effort. However, with the vast data available and improved computational tools, reasonably accurate computer generated CCT diagrams can be produced quickly. These computer generated diagrams can give the materials design engineer a reasonable understanding of the effect of subjecting a given alloy to various processing routes and hence the resultant microstructures. Since final microstructure is a key variable in determining the linepipe steel material properties, the chosen alloy/processing route and its effect on the final microstructure needs to be understood. This paper will discuss the role of CCT diagrams in the design of steels (cost, alloy, processing, and microstructure) for oil and gas transmission pipelines. Examples of computer generated CCT digrams for various API alloy designs are included.

The Prediction of the Flow Stress of an Extra-Low Carbon Steel in the Two-Phase Region Using Continuous Cooling Curves

1996 ◽  
Vol 118 (4) ◽  
pp. 463-470 ◽  
Author(s):  
Yhu-Jen Hwu ◽  
J. G. Lenard ◽  
J. J. M. Too
Keyword(s):  
Phase Transformation ◽  
Flow Stress ◽  
Carbon Steel ◽  
Volume Fraction ◽  
Low Carbon Steel ◽  
Phase Region ◽  
Cooling Curves ◽  
Low Carbon ◽  
Two Phase ◽  
Continuous Cooling

Continuous cooling curves of an extra-low carbon steel under three cooling rates are measured. The flow stress of the steel is established in compression tests during which the temperature is continuously decreasing. The phase transformation temperatures are determined from the cooling rate curve. The latent heat during phase transformation is calculated. A new variable, related to the volume fraction of transformation, is defined. Experimental results show that the relationship between the softening ratio of the flow stress due to phase transformation and this new variable may be described by a quadratic relationship. Based on this relationship and the continuous cooling curves, the flow stresses in the two-phase region are successfully predicted.

Role of Functional Groups in Strengthening Polymer−Polymer Interfaces:  Random Copolymers with Hydrogen-Bonding Functionalities

1998 ◽  
Vol 10 (4) ◽  
pp. 994-1002 ◽  
Author(s):  
Brian D. Edgecombe ◽  
Jean M. J. Fréchet ◽  
Zhihua Xu ◽  
Edward J. Kramer
Keyword(s):  
Hydrogen Bonding ◽  
Functional Groups ◽  
Random Copolymers ◽  
Polymer Interfaces
Sign in / Sign up

Export Citation Format

Share Document