Evolution of Crystallographic Structure of M23C6 Carbide Under Thermal Aging of P91 Steel

被引：18

作者：

Baltusnikas, Arunas ^{[1
]}

Grybenas, Albertas ^{[1
]}

Kriukiene, Rita ^{[1
]}

Lukosiute, Irena ^{[1
]}

Makarevicius, Vidas ^{[1
]}

机构：

[1] Lithuanian Energy Inst, Lab Mat Res & Testing, Breslaujos St 3, LT-44403 Kaunas, Lithuania

来源：

JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE | 2019年 / 28卷 / 03期

关键词：

M23C6; P91; steel; Rietveld refinement; site occupancy; thermal aging; XRD; SITE PREFERENCE; STABILITY; PARAMETERS; STRENGTH; BEHAVIOR; MO;

D O I：

10.1007/s11665-019-03935-1

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The structural changes of P91 steel after different heat treatment and M23C6 lattice expansion are well described by JMA kinetics law; however, the role of molybdenum on the M23C6 lattice expansion is not clearly revealed. The aim of the present work is to investigate the solubility of molybdenum in M23C6 lattice when iron or chromium atoms are replaced by molybdenum and to examine the effect of crystallographic structure changes on the mechanical properties of thermal aged P91 steel. Rietveld analysis of electrochemically extracted residues from the as-received and thermally aged at 600, 650 and 700 degrees C steel revealed that it is possible to measure and evaluate quantitatively the fraction of 8c crystallographic site occupation by molybdenum atoms of the M23C6 lattice. It was shown that the value of the site occupation factor plotted in natural logarithmic scale increases linearly and obeys Johnson-Mehl-Avrami kinetic law, giving Avrami exponent n(avg) = 0.3356 and activation energy E = 272 kJ/mol. Hardness measurements of the aged samples indicate that the deterioration of properties is closely coherent to the growth of crystallite size.

引用

页码：1480 / 1490

页数：11

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