固溶温度对TP347HFG耐热钢组织和性能的影响

doi:10.11896/j.issn.1005-023X.2018.02.015

《材料导报》期刊社

2018, Vol. 32

Issue (2): 234-237 https://doi.org/10.11896/j.issn.1005-023X.2018.02.015

物理材料研究｜材料

固溶温度对TP347HFG耐热钢组织和性能的影响

张弘,周平,孙兰,范洪远

四川大学制造科学与工程学院,成都 610065

Effect of Solution Temperature on Microstructure and Properties of TP347HFG Heat Resistant Steel

Hong ZHANG,Ping ZHOU,Lan SUN,Hongyuan FAN

Department of Manufacturing Science and Engineering,Sichuan University, Chengdu 610065

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摘要

采用金相显微镜、扫描电镜、布氏硬度测试、拉伸测试等手段研究了不同固溶温度下TP347HFG钢的组织和性能。结果表明,随着固溶温度升高,TP347HFG耐热钢晶粒度降低,固溶温度为1 180 ℃时晶粒尺寸、形状均匀;固溶温度为1 210 ℃时晶粒明显长大,且尺寸不均匀;TP347HFG耐热钢第二相由大颗粒相和小颗粒相组成,其主要成分均为NbC;固溶温度为1 120 ℃和1 180 ℃时小颗粒第二相在晶界析出,对晶界强化作用显著,1 210 ℃时第二相大部分在晶粒内部析出,并有Ostwald熟化现象发生,细小第二相消溶而较大颗粒第二相变大,从而影响基体性能;固溶温度为1 120 ℃和1 180 ℃时其抗拉强度和R_p0.2最高,随着固溶温度的升高,伸长率增加而硬度降低。

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关键词: TP347HFG耐热钢固溶温度组织性能

Abstract:

TP347HFG heat resistant steel with different solution temperature were characterized by OM, SEM, hardness and tensile strength test, and its microstructure and corresponding properties were investigated as well. Results show that the grain size of TP347HFG heat resistant steel decreases as the solution temperature increases. Their crystalline sizes are evenly distributed with the solution temperature at 1 180 ℃, whereas the crystalline sizes increase and unevenly disperse at 1 210 ℃. The second phase of TP347HFG heat resistant steel, which is mainly NbC, is composed of both large particles and small particles. Small second phase precipitate at the grain boundary at 1 180 ℃ and 1 120 ℃, which can strengthen the grain boundaries. Most part of the second phase precipitate at 1 210 ℃ in the grains with simultaneous occurrence of the Ostwald ripening phenomenon, where the particle distribution of small second phase diminishes while that of larger one increases, and thus bringing the change of corresponding fundamental properties. The values of tensile strength and Rp_0.2 reach their peaks with the solution temperature at 1 120 ℃ and 1 180 ℃. The elongation property of this material improves while its hardness decreases, as the increasing solution temperature.

Key words: TP347HFG heat resistant steel solution temperature microstructure properties

出版日期: 2018-01-25 发布日期: 2018-01-25

ZTFLH:

TG142.1

基金资助: 四川省科技支撑计划(2015GZ0055)

引用本文:

张弘,周平,孙兰,范洪远. 固溶温度对TP347HFG耐热钢组织和性能的影响[J]. 《材料导报》期刊社, 2018, 32(2): 234-237.
Hong ZHANG,Ping ZHOU,Lan SUN,Hongyuan FAN. Effect of Solution Temperature on Microstructure and Properties of TP347HFG Heat Resistant Steel. Materials Reports, 2018, 32(2): 234-237.

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https://www.mater-rep.com/CN/10.11896/j.issn.1005-023X.2018.02.015 或 https://www.mater-rep.com/CN/Y2018/V32/I2/234

表1 TP347HFG耐热钢的化学成分 (质量分数,%)

表2 1—5号试样热处理工艺

图1 拉伸试样尺寸(单位:mm)

图2 不同固溶处理温度下样品的金相图:(a)1 120 ℃, (b)1 150 ℃,(c)1 180 ℃,(d)1 210 ℃, (e)original sample

Solution temperature/℃	1 120	1 150	1 180	1 210	Original sample
M	500	500	500	200	500
$P ?$	12.5	11.6	10.4	12.0	14.5
L/mm	140	140	140	140	140
G	7.7	7.5	7.1	4.9	8.1

表3 试样晶粒度

图3 试样的SEM图片:(a)1 120 ℃,(b)1 150 ℃,(c)1 180 ℃,(d)1 210 ℃,(e)original sample

图4 (a)大颗粒第二相及(b)小颗粒第二相成分EDS分析

表4 TP347HFG钢抗拉强度、Rp0.2、伸长率及硬度值

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