微量Ta和Zr对Fe-Cr-Al系不锈钢高温组织稳定性的影响

doi:10.11901/1005.3093.2016.695

材料研究学报

2017, Vol. 31

Issue (5): 336-344 DOI: 10.11901/1005.3093.2016.695

论文

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微量Ta和Zr对Fe-Cr-Al系不锈钢高温组织稳定性的影响

张军政¹, 温冬辉¹, 姜贝贝¹, 张瑞谦², 王清¹(

), 董闯¹

1 大连理工大学三束材料改性教育部重点实验室材料科学与工程学院大连 116024
2 中国核动力研究设计院反应堆燃料及材料重点实验室成都 610213

Effect of Minor Ta- and Zr-alloying on High-temperature Microstructural Stability of Fe-Cr-Al-based Ferritic Stainless Steels

Junzheng ZHANG¹, Donghui WEN¹, Beibei JIANG¹, Ruiqian ZHANG², Qing WANG¹(

), Chuang DONG¹

1 Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
2 Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610041, China

引用本文:

张军政, 温冬辉, 姜贝贝, 张瑞谦, 王清, 董闯. 微量Ta和Zr对Fe-Cr-Al系不锈钢高温组织稳定性的影响[J]. 材料研究学报, 2017, 31(5): 336-344.
Junzheng ZHANG, Donghui WEN, Beibei JIANG, Ruiqian ZHANG, Qing WANG, Chuang DONG. Effect of Minor Ta- and Zr-alloying on High-temperature Microstructural Stability of Fe-Cr-Al-based Ferritic Stainless Steels[J]. Chinese Journal of Materials Research, 2017, 31(5): 336-344.

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摘要:

用团簇成分式方法对Fe-Cr-Al-Mo-Nb合金进行成分解析,并在此基础上确定了Fe-Cr-Al三元基础成分式Fe₇₅Al_9.375Cr_15.625 (at.%),进而添加Mo、Nb、Ta和Zr元素替代部分Cr元素。采用真空电弧熔炼制备设计的母合金锭,然后进行1200℃/2 h固溶处理,进而在800℃进行多道次热轧成板,再进行800℃/24 h时效处理,最后在不同温度进行高温固溶处理,研究了微量元素添加对合金高温组织稳定性的影响。结果表明, 对于800℃/24 h时效的Mo/Nb/Ta/Zr合金化样品,第二相(Laves相)粒子均弥散分布于铁素体基体中。1000℃/1 h再固溶处理,使系列合金中的第二相粒子发生回溶,至1200℃/1 h固溶后只含有Mo/Nb的合金中的第二相粒子已全部溶入到基体中,而在Ta和Zr微合金化的样品中仍有第二相粒子存在于基体的晶界处,有效抑制了基体晶粒在高温下异常长大,从而提高基体的组织稳定性和合金在高温下的力学性能。

关键词 ：金属材料, Fe-Cr-Al-Mo-Nb/Ta/Zr合金, 铁素体不锈钢, 合金化, 组织稳定性, 第二相析出

Abstract：

The composition rule of the high-performance Fe-Cr-Al-Mo-Nb alloys was investigated in light of a cluster formula approach, and then a ternary cluster formula of Fe₇₅Al_9.375Cr_15.625 (at.%) was determined. Mo, Nb, Ta, and Zr were added into the alloy to partially substitute for partial Cr of Fe-Cr-Al-Mo-Nb alloys. Alloy ingots were prepared by vacuum arc melting, and then solution-treated at 1200oC for 2h before hot-rolled at 800oC into sheets. The alloy sheets samples were aged at 800oC for 24 hrs, followed by re-solution treatments at 1000oC, 1100oC and 1200oC for 1 h respectively. The microstructure and microstructural stability at high temperature of the alloy sheetssamples under various treatments were comparatively studied compared to study the HT microstructural stability of this series of alloys. The results show that the fine precipitates (Laves phase) distributed homogeneously in the ferritic matrix of the aged Mo/Nb/Ta/Zr alloy sheetsed samples. However, these particles begin to re-dissolve into the matrix after 1000oC/1 h solution treatment. Moreover, these particles disappeared in the Mo/Nb containing alloy after 1200oC/1 h solution, while Ta or Zr further minor-alloying could still ensure a certain amount of precipitates distributed on the grain boundaries, which effectively suppresses the abnormal growth of grains at high temperature. Therefore, the HT microstructural stability at high temperature and the resulted ant mechanical properties could be improved.

Key words： metallic materials Fe-Cr-Al-Mo-Nb/Ta/Zr alloys ferritic stainless steels alloying microstructural stability the second phase precipitation

收稿日期: 2016-11-28

基金资助:中国核动力研究设计院反应堆燃料与材料重点实验室基金(ZX20150498),辽宁省自然科学基金(2015020202),国际科技合作计划(2015DFR60370),中央高校基本科研业务费专项资金(DUT16ZD212),国家自然科学基金(U1610256)

作者简介:

作者简介张军政,男,1990年生,硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2016.695 或 https://www.cjmr.org/CN/Y2017/V31/I5/336

表1 Mo/Nb/Ta/Zr合金化的Fe-Cr-Al系列合金成分及不同处理状态下的显微硬度HV

图1 Mo/Nb/Ta/Zr合金化的Fe-Cr-Al系列合金热轧薄板经800℃/24 h时效后的XRD图

图2 Mo/Nb/Ta/Zr合金化的Fe-Cr-Al系列合金热轧薄板经800℃/24 h时效后的OM金相和SEM电子背散射像

图3 Mo/Nb/Ta/Zr合金化的Fe-Cr-Al系列时效合金在不同温度固溶处理后的SEM电子背散射像

图4 Mo/Nb/Ta/Zr合金化的Fe-Cr-Al系列时效合金在不同温度固溶处理后的OM金相组织. 1: 1000℃/1 h, 2: 1100℃/1 h, and 3: 1200℃/1 h

图5 No.2(Mo/Nb/Ta合金化)时效合金在1200℃固溶处理1 h后的EPMA结果

图6 No.3(Mo/Nb/Zr合金化)时效合金在1200℃固溶处理1 h后的EPMA结果

图7 Mo/Nb/Ta/Zr合金化的Fe-Cr-Al系列合金不同处理状态下的显微硬度HV

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