Effect of Laves Phase on Ductile-Brittle Transition of 12 Pct Cr Steel

被引：9

作者：

Borisova, J. ^{[1
]}

Dudko, V. ^{[1
]}

Mishnev, R. ^{[1
]}

Kaibyshev, R. ^{[1
]}

机构：

[1] Belgorod State Univ, Pobeda 85, Belgorod 308015, Russia

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2019年 / 50A卷 / 08期

关键词：

LONG-TERM CREEP; TEMPERED MARTENSITE EMBRITTLEMENT; MECHANICAL-PROPERTIES; MICROSTRUCTURAL EVOLUTION; PRECIPITATION BEHAVIOR; FRACTURE-TOUGHNESS; IMPACT PROPERTIES; RESISTANT STEEL; DELTA-FERRITE; POWER-PLANTS;

D O I：

10.1007/s11661-019-05269-y

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The impact toughness of a martensitic 12 Cr-0.6 Mo-2.2 W-4 Co-0.8 Cu-VNb (in wt pct) steel subjected to tempering at 770 degrees C for 3 hours and aging at 650 degrees C for 643 hours was examined in the temperature range of -20 to 250 degrees C. The steel in the tempered condition exhibits a ductile-brittle transition temperature (DBTT) of 41 degrees C and a Charpy V-notch impact energy of 100 J/cm(2) at a temperature of 20 degrees C. The tempered steel becomes completely brittle at 0 degrees C when the absorbed energy falls to 8 J/cm(2). The aging leads to the precipitation of a Laves phase at boundaries of the tempered martensite lath structure (TMLS). This deteriorates the impact toughness, the DBTT increases to 20 J/cm(2), the impact toughness at a temperature of 20 degrees C decreases to 20 J/cm(2). Under impact loads, the Laves phase particles serve as additional nucleation sites for micro-crack/void that facilitates unstable crack propagation. As a result, the appearance of cracks with critical dimensions takes place after stable crack propagation over a very short distance, and embrittlement takes place at relatively high temperatures.

引用

页码：3528 / 3543

页数：16

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