Open AccessDuctile fracture behavior and flow stress modeling of 17-4PH martensitic stainless steel in tensile deformation at high temperature
Author(s) -
Chao Feng,
Li Zhang,
Jian Wu,
Hang Yu
Publication year - 2020
Publication title -
materials research express
Language(s) - English
Resource type - Journals
ISSN - 2053-1591
DOI - 10.1088/2053-1591/ab815f
Subject(s) - necking , materials science , flow stress , deformation (meteorology) , strain rate , ductility (earth science) , stress (linguistics) , ultimate tensile strength , tensile testing , composite material , fracture (geology) , elongation , martensite , metallurgy , martensitic stainless steel , creep , microstructure , linguistics , philosophy
The ductile fracture behavior of 17-4PH martensitic stainless steel at high temperature was investigated based on the experimental data of hot uniaxial tensile test. The elongation and reduction of area indicated that the ductility was mainly enhanced during the deformation at the temperature 1150 °C–1200 °C with high strain rate more than 0.1 s −1 . The hot flow stress curves were obtained from the tensile experiments, and the true strain of necking initiation was determined by analyzing the contours of fractured specimens. Then, the true stress-true strain data of the deformations before necking were adopted to establish the tensile flow stress model. In order to express the combined influences of the strain, strain rate and temperature on flow stress, a modified Johnson-Cook model was proposed to describe the hot constitutive behavior of the presented steel. It indicates that reasonable agreements between the model-predicted results and the experimental data were achieved.