INFLUENCE OF COHERENT AUSTENITE TWIN BOUN-DARIES ON THE VARIANT SELECTION OF BAINITIC FERRITE IN Fe--C--Mn--Si STEELS

2013 ◽  
Vol 48 (4) ◽  
pp. 385-392 ◽  
Author(s):  
Xixia WANG ◽  
Hui GUO ◽  
Ding WANG ◽  
Yin BAI ◽  
Shanwu YANG ◽  
...  
Keyword(s):  
Bainitic Ferrite ◽  
Variant Selection ◽  
Selection Of

Key Factors in Grain Refinement of Martensite and Bainite

2010 ◽  
Vol 638-642 ◽  
pp. 3044-3049 ◽  
Author(s):  
Tadashi Furuhara ◽  
Naoki Takayama ◽  
Goro Miyamoto
Keyword(s):  
Grain Refinement ◽  
Lath Martensite ◽  
Bainitic Ferrite ◽  
Transformation Strain ◽  
Variant Selection ◽  
Key Factors ◽  
Austenite Grain ◽  
Austenite Grain Boundary ◽  
Block Sizes ◽  
Selection Of

Grain refinement in lath martensite and bainite structures, which is important for strengthening and toughening, are discussed in various aspects. Strain accommodation plays important roles to determine final crystal sizes of bainitic ferrite (BF) and martensite. There is strong variant selection of BF by natures of the austenite grain boundary where it nucleates. For small undercooling, such variant selection leads to coarse bainite block and packet sizes. More BF variants are formed by increasing undercooling, which leads to nucleation of BF variants of less potency, and by increasing strength of materials, which results in more self-accommodation of transformation strain due to suppression of plastic accommodation. In lath martensite, there seems to be similar variant selection at austenite grain boundaries. However, packet/block sizes in lath martensite decreases with an increase in carbon content because of more extensive self-accommodation due to lower transformation temperatures than bainite.

scholarly journals Strain Accommodations among Twin Variants in Ti and Mg

Crystals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 453
Author(s):  
Ping Zhou ◽  
Guo-Zhen Zhu
Keyword(s):  
Mechanical Property ◽  
Great Influence ◽  
Local Strain ◽  
Deformation Texture ◽  
Variant Selection ◽  
Slip Systems ◽  
Twinning Shear ◽  
Active Variant ◽  
Shed Light ◽  
Selection Of

The selection of twin variants has a great influence on deformation texture and mechanical property in hcp metals where slip systems are limited and twinning types are abundant during deformation. Local strain accommodations among twin variants are considered to shed light on variant selection rules in Ti and Mg alloys. Five kinds of strain accommodations are discussed in terms of different regions that are affected by the twinning shear of primary twin. These regions contain (I) the whole sample, (II) neighboring grain, (III) adjacent primary twin in neighboring grain, (IV) adjoining primary twin within the same parent grain, and (V) multi-generation of twinning inside the primary twin. For a potentially active variant, its operation needs not only relatively higher resolved shear stress but also easily accommodated strain by immediate vicinity. Many of the non-Schmid behaviors could be elucidated by local strain accommodations that variants with relatively higher SFs hard to be accommodated are absent, while those with relatively lower SFs but could be easily accommodated are present.

Strain compatibility effect on the variant selection of connected twins in magnesium

2015 ◽  
Vol 76 ◽  
pp. 71-76 ◽  
Author(s):  
Changfa Guo ◽  
Renlong Xin ◽  
Jianbin Xu ◽  
Bo Song ◽  
Qing Liu
Keyword(s):  
Compatibility Effect ◽  
Variant Selection ◽  
Strain Compatibility ◽  
Selection Of

A novel method for predicting variant selection of {101¯2} twins in pure hafnium

2021 ◽  
pp. 130738
Author(s):  
Yingdong Zhang ◽  
Geping Li ◽  
Fusen Yuan ◽  
Fuzhou Han ◽  
Muhammad Ali ◽  
...  
Keyword(s):  
Variant Selection ◽  
Novel Method ◽  
Selection Of

Application of a Genetic Algorithm to Concept Variant Selection

2006 ◽  
Author(s):  
Ryan S. Hutcheson ◽  
Robert L. Jordan ◽  
Robert B. Stone ◽  
Janis P. Terpenny ◽  
Xiaomeng Chang
Keyword(s):  
Genetic Algorithm ◽  
Product Development ◽  
Solution Space ◽  
Variant Selection ◽  
Functional Modeling ◽  
Detailed Design ◽  
Modeling Techniques ◽  
Break Even Point ◽  
Future Work ◽  
Selection Of

This paper outlines a framework for applying a genetic algorithm to the selection of component variants between the conceptual and detailed design stages of product development. A genetic algorithm (GA) is defined for the problem and an example is presented that demonstrates its application and usefulness. Functional modeling techniques are used to formulate the design problem and generate the chromosomes that are evaluated with the algorithm. In the presented example, suitable GA parameters and the break-even point where the GA surpassed an enumerated search of the same solution space were found. Recommend uses of the GA along with limitations of the method and future work are presented as well.

Variant selection of {10-12}-{10-12} double twins during the tensile deformation of an AZ31 Mg alloy

2017 ◽  
Vol 700 ◽  
pp. 226-233 ◽  
Author(s):  
Renlong Xin ◽  
Changfa Guo ◽  
John J. Jonas ◽  
Gang Chen ◽  
Qing Liu
Keyword(s):  
Tensile Deformation ◽  
Mg Alloy ◽  
Variant Selection ◽  
Az31 Mg Alloy ◽  
Selection Of

Variant selection of primary, secondary and tertiary twins in a deformed Mg alloy

2012 ◽  
Vol 60 (5) ◽  
pp. 2043-2053 ◽  
Author(s):  
Sijia Mu ◽  
John J. Jonas ◽  
Günter Gottstein
Keyword(s):  
Mg Alloy ◽  
Variant Selection ◽  
Selection Of
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