The formation and dissolution of residual δ ferrite in ASME Grade 91 steel plates

被引：35

作者：

Kobayashi, Satoru ^{[1
]}

Sawada, Kota ^{[1
]}

Hara, Toru ^{[1
]}

Kushima, Hideaki ^{[1
]}

Kimura, Kazuhiro ^{[1
]}

机构：

[1] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2014年 / 592卷

关键词：

Electron microscopy; Steel; Thermomechanical processing; Precipitation; HEAT-TREATMENT;

D O I：

10.1016/j.msea.2013.10.058

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

This paper investigated the relationship between creep strength and the existence of residual delta ferrite in the initial microstructure in three heats of Grade 91 steel plates and examined the origin, the transformation process and the dissolution of the delta ferrite in the steel plates. The creep strength of the steel specimens was lower when the delta ferrite was present in the initial microstructure. The delta ferrite showed a disk shape and a bumpy interface, and had MX carbonitride particle arrays inside and coarse M23C6 carbide particles on the bumpy interface. Chromium and molybdenum were found to segregate in/around the delta ferrite disk. The residual delta ferrite dissolved completely after an additional normalizing heat treatment at 1050 degrees C for 30 min. The results obtained strongly indicate that the presence of delta ferrite is due to insufficient normalizing heat treatment time to remove segregation during solidification. The delta ferrite was also found to grow through a diffusional transformation during cooling from the normalizing heat treatment. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：241 / 248

页数：8

共 23 条

[1]

[Anonymous], 2008, SA387SA387M ASME NIM

[2]

[Anonymous], 2007, SA213SA213M ASME NIM

[3]

[Anonymous], 2011, A387A387M10 ASTM INT

[4]

ASME Boiler % Pressure Vessel Code, 2010, SA387SA387M ASME A

[5]

BRUHL F, 1991, STEEL RES, V62, P75

[6]

Golanski G., 2010, ARCH MAT SCI ENG, V46, P88

[7]

Hara T., 2012, J ALLOYS COMPD

[8]

Igarashi M., 2006, P 8 LIEG C MAT ADV P, P1095

[9] PHASE-TRANSFORMATIONS AND MICROSTRUCTURE CHANGES IN A 12-PERCENT-CR-STEEL DURING TEMPERING AT 1053-K [J].

JANOVEC, J ;

RICHARZ, B ;

GRABKE, HJ .

STEEL RESEARCH, 1994, 65 (10) :438-443

[10] MICROSTRUCTURAL EVOLUTION OF MODIFIED 9CR-1MO STEEL [J].

JONES, WB ;

HILLS, CR ;

POLONIS, DH .

METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1991, 22 (05) :1049-1058

← 1 2 3 →