Ductile-brittle transition in a 9% Cr heat-resistant steel

被引：33

作者：

Dudko, Valeriy ^{[1
]}

Fedoseeva, Alexandra ^{[1
]}

Kaibyshev, Rustam ^{[1
]}

机构：

[1] Belgorod State Univ, Belgorod 308015, Russia

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2017年 / 682卷

基金：

俄罗斯科学基金会;

关键词：

Fracture mode; Ductile-brittle transition; Tensile and impact properties; Fracture properties; Martensitic steel; NANOSTRUCTURED FERRITIC ALLOY; MECHANICAL-PROPERTIES; CARBON CONTENT; TEMPERATURE; TOUGHNESS; BEHAVIOR; FRACTURE; MICROSTRUCTURE; STRENGTH; MARTENSITE;

D O I：

10.1016/j.msea.2016.11.035

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The mechanical behavior of a P92-type steel was studied by tension and Charpy impact tests in the temperature range of 77-293 K. The yield stress (YS) and uniform elongation increase concurrently with decreasing temperature because the steel exhibits work-hardening behavior. Transgranular dimpled fracturing remains the primary fracture mechanism under tension down to 193 K. Brittle fracture takes place at lower temperatures. At 77 K, the steel exhibits a well-defined yield plateau. Impact tests demonstrate that the ductile-brittle transition (DBT) occurs at 210 K. At 193 K, the energy absorption of 110 J/cm(2) at high impacts is attributed to extended areas of crack initiation and a stable crack propagation; the fast fracture load also has a high value. The steel becomes completely brittle at 77 K, at which temperature the absorbed energy falls to 6 J/cm(2).

引用

页码：73 / 84

页数：12

共 56 条

[1]

Abe F, 2008, WOODHEAD PUBL MATER, P1, DOI 10.1533/9781845694012

[2] Discontinuous yielding induced by the addition of nickel to interstitial-free steel [J].