Structural and Phase Transformations in Internally Nitrided Corrosion-Resistant Steel during Severe Plastic Deformation and Subsequent Annealings

被引：4

作者：

Rogachev, Stanislav O. ^{[1
]}

Nikulin, Sergey A. ^{[1
]}

Khatkevich, Vladimir M. ^{[1
]}

机构：

[1] Natl Univ Sci & Technol MISIS, Lab Hybrid Nanostruct Mat, Leninsky Pr 4, Moscow 119049, Russia

来源：

STEEL RESEARCH INTERNATIONAL | 2017年 / 88卷 / 11期

关键词：

high-pressure torsion; high-temperature nitirding; nanostructures; severe plastic deformation; steels; HIGH-PRESSURE TORSION; THERMAL-STABILITY; MICROHARDNESS; TRANSITIONS; EVOLUTION; HARDNESS; HPT;

D O I：

10.1002/srin.201700070

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The effect of severe plastic deformation (SPD) by high-pressure torsion (HPT) and subsequent annealings on structural and phase transformations in 0.08C-18Cr-0.5Ti steel, which is preliminarily hardened by high-temperature internal nitriding (the microhardness is 3.2GPa), has been studied. The HPT results in the formation of nanostructure with an average structural-element size of 55nm and the refining and in part dissolution of Cr2N particles. After HPT, the microhardness of steel increases by 2.7 times (to 8.6GPa at the midradius of samples), which is substantially higher than the microhardness of non-nitrided steel after HPT. The hardening of the material remains during heating to a temperature of no less than 450 degrees C at the expense of precipitation of disperse Cr2N particles and despite of coarsening structural elements. HPT of nitrided steel leads to a shift of phase transformations, namely the temperature of chromium nitride precipitation decreases.

引用

页数：7