scholarly journals Effect of tensile deformation on variant selection in {225}γ plate martensite and {557}γ lath martensite

2019 ◽  
Vol 1 ◽  
pp. 100006
Author(s):  
Annick P. Baur ◽  
Cyril Cayron ◽  
Roland E. Logé
Keyword(s):  
Tensile Deformation ◽  
Lath Martensite ◽  
Variant Selection ◽  
Plate Martensite

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

Morphology, Nature and Formation Mechanism of Packet Plate Martensite in Medium and High Carbon Steels

2011 ◽  
Vol 121-126 ◽  
pp. 231-238 ◽  
Author(s):  
Yue Xin Ma ◽  
Yue Jun Liu ◽  
Long Wang ◽  
De Chang Zeng ◽  
Yu Hua Tan
Keyword(s):  
Twin Boundary ◽  
Misorientation Angle ◽  
Martensite Transformation ◽  
Lath Martensite ◽  
Carbon Steels ◽  
Plate Martensite ◽  
Low Carbon ◽  
High Carbon ◽  
Boundary Misorientation ◽  
Carbon Martensite

The microstructures of 11 kinds of commercial steels quenched from high temperature were deeply studied by optical microscope and canning election microscope. It was proved that packet martensite in medium and high carbon steels is not lath martensite, but rather packet plate martensite. Through the analysis of crystallography，it was found that four change rules of crystal orientation may arise during the process of martensite transformation. Two inner interfaces spontaneously formed were only discovered in martensite transformation process: small-angel boundary (misorientation angle is 0 ~ 10º) and twin boundary (misorientation angle is 70º32’). The former mainly appeared in low carbon martensite, and the latter principally formed in medium and high carbon martensite. The twin boundary packet mechanism in medium and high carbon steels has made in detail in this paper.

scholarly journals Comparison of Variant Selection between Lenticular and Lath Martensite Transformed from Deformed Austenite

2013 ◽  
Vol 53 (5) ◽  
pp. 915-919 ◽  
Author(s):  
Tadachika Chiba ◽  
Goro Miyamoto ◽  
Tadashi Furuhara
Keyword(s):  
Lath Martensite ◽  
Variant Selection

Unusual Plastic Deformation Behavior in Lath Martensitic Steel Containing High Dislocation Density

2017 ◽  
Vol 905 ◽  
pp. 46-51
Author(s):  
Stefanus Harjo ◽  
Takuro Kawasaki ◽  
Yo Tomota ◽  
Wu Gong
Keyword(s):  
Plastic Deformation ◽  
Dislocation Density ◽  
Deformation Behavior ◽  
Tensile Deformation ◽  
Lath Martensite ◽  
Strengthening Mechanism ◽  
High Dislocation Density ◽  
Random Arrangement ◽  
Plastic Deformation Behavior ◽  
In Situ Neutron Diffraction

To understand the strengthening mechanism of a metallic material with high dislocation density, the plastic deformation behavior of lath martensite was studied by means of in situ neutron diffraction measurements during tensile deformations using a 22SiMn2TiB steel and a Fe-18Ni alloy. The characteristics of dislocation were analyzed and were discussed with the relation of stress-strain curves. The dislocation densities (ρ) induced by martensitic transformation during heat-treatment in both materials were found to be originally as high as 1015 m-2 order, and subsequently to increase slightly by the tensile deformation. The parameter M value which displays the dislocation arrangement dropped drastically at the beginning of plastic deformation in both materials, indicating that the random arrangement became more like a dipole arrangement.

Morphology and Formation Mechanism of Martensite in Steels with Different Carbon Content

2011 ◽  
Vol 201-203 ◽  
pp. 1612-1618 ◽  
Author(s):  
Yun Ping Ji ◽  
Zong Chang Liu ◽  
Hui Ping Ren
Keyword(s):  
Electron Microscope ◽  
Carbon Steel ◽  
Carbon Content ◽  
Formation Mechanism ◽  
Lath Martensite ◽  
High Carbon Steel ◽  
Volumetric Strain ◽  
Medium Carbon Steel ◽  
Plate Martensite ◽  
Low Carbon

0MnVTiNb, 12Cr1MoV, 20Cr2Ni4, 35CrMo, 40Cr, 42CrMo, 60Si2CrV and T8 steels and Fe-1.2C alloy were used to study the morphology and formation mechanism of martensite by metallographic microscope, QUANTA-400 environmental scanning electron microscope and JEM-2100 transmission electron microscope after they were austenized at different temperature and then quenched respectively. The results show that the martensite of low-carbon steel is lath martensite, the martensite of high-carbon steel is plate martensite, and the martensite of medium-carbon steel is the integrated microstructure of lath martensite and plate martensite. With the increase of carbon content, the morphology of martensite in steel evolves from lath shape to plate shape, the distribution of martensite slices changes from in parallel to with crossing angle, and the substructure evolves from high density dislocations and stacking faults to twin crystals. The martensite in steel can nucleate in the austenite crystal grain interior as well as along the austenite crystal grain boundary. It is proposed that the volumetric strain energy in martensite transformation is the essential reason of the different morphologies of martensite.

Quantitative analysis of variant selection in ausformed lath martensite

2012 ◽  
Vol 60 (3) ◽  
pp. 1139-1148 ◽  
Author(s):  
G. Miyamoto ◽  
N. Iwata ◽  
N. Takayama ◽  
T. Furuhara
Keyword(s):  
Quantitative Analysis ◽  
Lath Martensite ◽  
Variant Selection

Effect of tensile deformation of austenite on the morphology and strength of lath martensite

2012 ◽  
Vol 18 (2) ◽  
pp. 317-320 ◽  
Author(s):  
Zengmin Shi ◽  
Kai liu ◽  
Maoqiu Wang ◽  
Jie Shi ◽  
Han Dong ◽  
...  
Keyword(s):  
Tensile Deformation ◽  
Lath Martensite

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 Effect of Stress on Variant Selection of Lath Martensite in Low-carbon Steel

2012 ◽  
Vol 98 (8) ◽  
pp. 425-433 ◽  
Author(s):  
Yamato Mishiro ◽  
Shoichi Nambu ◽  
Junya Inoue ◽  
Toshihiko Koseki
Keyword(s):  
Carbon Steel ◽  
Lath Martensite ◽  
Low Carbon Steel ◽  
Variant Selection ◽  
Low Carbon ◽  
Selection Of

Variant Selection of Plate Martensite in Fe-28.5at.%Ni Alloy

2006 ◽  
Vol 512 ◽  
pp. 117-122 ◽  
Author(s):  
Hiromoto Kitahara ◽  
Masato Ueda ◽  
Nobuhiro Tsuji ◽  
Yoritoshi Minamino
Keyword(s):  
Shear Strain ◽  
Equivalent Strain ◽  
Crystallographic Analysis ◽  
Coarse Grained ◽  
Variant Selection ◽  
Plate Martensite ◽  
Ni Alloy ◽  
Back Scattering ◽  
Habit Planes ◽  
Selection Of

Variant selection rule of plate martensite in a coarse-grained Fe-28.5at.%Ni alloy was investigated. Crystallographic analysis of martensite plates was carried out by electron back scattering diffraction (EBSD) analysis in a scanning electron microscope with a field emission type gun (FE-SEM). Certain variant selections were recognized for martensite plates in the Fe-28.5at.%Ni alloy. Equivalent strain, which was calculated from the shape strain of each variant, was used to evaluate the accommodation of the shear strain induced by martensite transformation. Variant selection was ruled not only by the shear strain accommodation but also by the ngle between habit planes of adjacent martensite plates.

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