Mechanical Properties and Fracture of Heat-Resistant Ferritic-Martensitic Steels EK-181, ChS-139 and EP-823 at the Temperatures from-196 to 720 °C

被引：0

作者：

Polekhina, N. A. ^{[1
,2
]}

Almaeva, K. V. ^{[1
,2
]}

Litovchenko, I. Yu. ^{[1
,2
]}

机构：

[1] RAS, SB, Inst Strength Phys & Mat Sci, Tomsk 634055, Russia

[2] Natl Res Tomsk State Univ, Tomsk 634050, Russia

来源：

PROCEEDINGS OF THE ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES | 2018年 / 2051卷

关键词：

D O I：

10.1063/1.5083485

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The variations in the short-term mechanical properties of heat resistant ferritic-martensitic 12% chromium steels EK-181, ChS-139 and EP-823 are investigated, followed by an examination of the features of their plastic deformation and fracture under active tension in the temperature range from -196 to 720 degrees C. The temperature curves of the yield strength and relative elongation and the features of fracture of these steels after traditional heat treatment are found to be qualitatively similar. The variations in the ductility and fracture behavior of these steels are attributed to the features of their yield stress temperature dependence. In the region of positive (up to about 450 degrees C) temperatures, these features are determined by a weak temperature dependence of the value of dispersion hardening by nanoscale V(C, N) particles; in the negative temperature range by a strong temperature dependence of the thermally activated mobility of dislocations in the crystallographic relief (Peierls barrier, solid solution of impurities). The deformation in the neck region of the specimens fractured at T = 20 degrees C is observed to degrade the martensitic structure, resulting in the curvature and migration of the martensitic lamella boundaries and fragmentation of the martensite laths. After deformation at 650 degrees C, numerous practically equiaxed ferrite grains are observed to form, which indicates the initial stage of recrystallization.

引用

页数：4

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