Microstructure and Mechanical Properties of Martensitic High-Strength Engineering Steel

被引：6
|
作者：
Maisuradze, M. V. [1 ]
Ryzhkov, M. A. [1 ]
Lebedev, D. I. [1 ,2 ]
机构：
[1] FGAOU VO BN Yeltsin Ural Fed Univ, Ekaterinburg, Russia
[2] Russian Acad Sci, MN Mikheev Inst Met Phys, Ural Sect, Ekaterinburg, Russia
来源：
METALLURGIST | 2020年 / 64卷 / 7-8期
关键词：
steel; martensite; bainite; microstructure; mechanical properties; strength; ductility; impact strength; heat treatment; BAINITE TRANSFORMATION; SUPERCOOLED AUSTENITE; M-S; PHASE;
D O I：
10.1007/s11015-020-01040-6
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
A promising martensitic steel with good hardenability is studied. In the cooling rate range 0.1-30 degrees C/sec and the only transformation recorded by a dilatometer starts at an M-s temperature of 355 +/- 10 degrees C. Microstructure and mechanical properties of the steel studied are analyzed after various heat treatment regimes: cooling from the austenitizing temperature at various rates (from 0.02 to 20 degrees C/sec), austempering at 280-380 degrees C, and oil quenching and tempering at 200-600 degrees C. It is shown that a 1000-fold change in the cooling rate has a weak effect on steel strength. Bainitic transformation in the steel in question occurs in the martensitic transformation temperature range, which leads to a reduction in impact strength compared with a martensitic microstructure both after slow cooling and isothermal hardening.
引用
收藏
页码：640 / 651
页数：12
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