Influence of austenitization temperature on phase transformation features of modified high Cr ferritic heat-resistant steel

被引：19
|
作者：
Gao, Qiuzhi [1 ]
Liu, Yongchang [1 ]
Di, Xinjie [1 ]
Yu, Liming [1 ]
Yan, Zesheng [1 ]
Qiao, Zhixia [2 ]
机构：
[1] Tianjin Univ, Sch Mat Sci & Engn, State Key Lab Hydaul Engn Simulat & Safety, Tianjin 300072, Peoples R China
[2] Tianjin Univ Commerce, Sch Mech Engn, Tianjin 300134, Peoples R China
来源：
NUCLEAR ENGINEERING AND DESIGN | 2013年 / 256卷
基金：
中国国家自然科学基金;
关键词：
MARTENSITE-START TEMPERATURE; GRAIN-SIZE; MECHANISM;
D O I：
10.1016/j.nucengdes.2012.12.009
中图分类号：
TL [原子能技术]; O571 [原子核物理学];
学科分类号：
0827 ; 082701 ;
摘要：
The phase transformation features of high Cr ferritic heat-resistant steel have been investigated using Differential Thermal Analysis (DTA) in accordance with different austenitization temperatures as 950 degrees C, 1050 degrees C, 1150 degrees C, 1200 degrees C and predicted by Thermo-calc calculation. The results based on DTA curves on heating showed that the magnetic transition and the A(c1) temperature occurred at 744.9 degrees C and 850.9 degrees C, respectively. The measured A(c3) temperature was around 919.5 degrees C, the obtained austenitization temperature range was about 69 degrees C. Two new phenomena were found: firstly, the onset temperature of martensite transformation increases strongly and then not obviously with the increase of austenitization temperature; secondly, the delta-ferrite abnormally forms in the specimen austenitized at 950 degrees C due to the existence of un-dissolved M23C6 particles. (c) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：148 / 152
页数：5
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