In Situ Analysis of Plastic Deformation of Lath Martensite During Tensile Process
Received date: 2020-07-22
Revised date: 2020-10-27
Online published: 2020-11-16
Supported by
National Basic Research Program of China(2010CB630802);National Natural Science Foundation of China(51201093);Hubei Technology Innovation Project(2017AAA113)
Lath martensitic steels are widely used in high strength structural materials. Coherency strains in quenched lath martensite induce huge dislocation densities, which are the sources of the alloys' strength, whereas the way its microstructure functions is still unclear. The plastic deformation behavior of lath martensite in ultrahigh strength steel was investigated using in situ neutron diffraction technology. Diffraction data were analyzed using the Z-Rietveld and convolutional multiple whole profile (CMWP) fitting procedures. Transformation dislocations in the as-quenched martensite were mixed with edge and screw components and showed characteristics of random distribution. Significant work hardening of lath martensite can be better understood by considering the increase in dislocation density along with changes in dislocation arrangement. With increased tensile strain, the total dislocation density increased with the increasing amount of edge-type components and the decreasing amount of screw-type components. The hard orientation packets showed characteristics of work hardening with an increased dislocation density, whereas the soft orientation packets showed characteristics of work softening with a decreased dislocation density. The partitioning of the applied load was carried out within two types of packets, which further promoted the formation of long-range internal stresses after deformation.
Zengmin SHI , Jingyu LIANG , Jian LI , Maoqiu WANG , Zifan FANG . In Situ Analysis of Plastic Deformation of Lath Martensite During Tensile Process[J]. Acta Metall Sin, 2021 , 57(5) : 595 -604 . DOI: 10.11900/0412.1961.2020.00275
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