Precipitation and Phase Transformations in 2101 Lean Duplex Stainless Steel During Isothermal Aging

被引：38

作者：

Maetz, Jean-Yves ^{[1
]}

Cazottes, Sophie ^{[1
]}

Verdu, Catherine ^{[1
]}

Kleber, Xavier ^{[1
]}

机构：

[1] Univ Lyon, INSA Lyon, MATEIS, UMR CNRS 5510, F-69621 Villeurbanne, France

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2016年 / 47A卷 / 01期

关键词：

THERMOELECTRIC-POWER; SIGMA-PHASE; HIGH-NITROGEN; CORROSION-RESISTANCE; SECONDARY AUSTENITE; DECOMPOSITION; BOUNDARY; GROWTH; IRON;

D O I：

10.1007/s11661-015-3215-7

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effect of isothermal aging at 963 K (690 A degrees C) on the microstructure of a 2101 lean duplex stainless steel, with the composition Fe-21.5Cr-5Mn-1.6Ni-0.22N-0.3Mo, was investigated using a multi-technique and multi-scale approach. The kinetics of phase transformation and precipitation was followed from a few minutes to thousands of hours using thermoelectric power measurements; based on these results, certain aging states were selected for electron microscopy characterization. Scanning electron microscopy, electron back-scattered diffraction, and transmission electron microscopy were used to quantitatively describe the microstructural evolution through crystallographic analysis, chemical analysis, and volume fraction measurements from the macroscopic scale down to the nanometric scale. During aging, the precipitation of M23C6 carbides, Cr2N nitrides, and sigma phase as well as the transformation of ferrite into austenite and austenite into martensite was observed. These complex microstructural changes are controlled by Cr volume diffusion. The precipitation and phase transformation mechanisms are described.

引用

页码：239 / 253

页数：15

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