时效处理对4A双相不锈钢σ相析出及性能的影响*

doi:10.11896/j.issn.1005-023X.2017.016.016

《材料导报》期刊社

2017, Vol. 31

Issue (16): 76-80 https://doi.org/10.11896/j.issn.1005-023X.2017.016.016

材料研究

时效处理对4A双相不锈钢σ相析出及性能的影响^*

卢盼盼¹, 王爱琴¹, 谢敬佩², 王文焱¹

1 河南科技大学材料科学与工程学院, 洛阳 471023;
2 河南科技大学材料科学与工程学院,有色金属共性技术河南省协同创新中心, 洛阳 471023

Effect of Aging on σ Phase Precipitation and Properties of 4A Duplex Stainless Steel

LU Panpan¹, WANG Aiqin¹, XIE Jingpei², WANG Wenyan¹

1 College of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023;
2 Collaborative Innovation Center of Nonferrous Metals of Henan Province, School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023

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摘要对固溶处理后的4A双相不锈钢(DSS4A)进行不同温度(750～900 ℃)的等温时效处理,利用OM观测各个时效温度下σ相的析出行为,重点观测了σ相在850 ℃时效不同时间(1 h、2 h和4 h)的析出过程,并通过SEM、EDS和TEM等检测手段对850 ℃、4 h时效处理后的σ相析出形貌进行分析,揭示了σ相的析出特征及形成机理。最后对时效条件下4A双相不锈钢的力学性能和耐蚀性能也进行了相应研究。结果表明:σ相富Cr、Mo而贫Ni,属于四方结构,由高温铁素体分解而成;σ相析出量随时效温度的升高先增加后降低并在850 ℃时达到峰值,同一温度下时效时间越长,σ相析出越多;σ相使材料硬度提高,但材料抗拉强度、冲击韧性和耐腐蚀性整体呈下降趋势,其中冲击韧性对σ相析出尤为敏感。

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关键词: 4A双相不锈钢时效处理 σ相性能

Abstract: The effect of aging treatment on precipitation behavior of σ phase of 4A duplex stainless steel after solution treatment was observed by OM, and the precipitation process of σ phase at 850 ℃ for different time was analyzed. In order to investigate the precipitation characteristics and the mechanisms of σ phase, the morphology of the sample by aging for 4 hours was analyzed by SEM, EDS and TEM. Finally, the mechanical properties and corrosion resistance of 4A duplex stainless steel were also studied. The results show that σ phase is rich in Cr, Mo but Ni-depleted, its crystal structure is tetragonal and it is formed by the decomposition of δ; σ phase precipitation increased first and then decreased with the increase of aging temperature, and it reaches a peak at 850 ℃. The σ phase precipitation is more, when the aging time is longer under the same temperature; σ phase causes higher hardness of the material, but generally declining tensile strength, impact toughness and corrosion resistance, among which the impact toughness is particularly sensitive to the σ phase precipitation.

Key words: 4A duplex stainless steel aging treatment σ phase property

出版日期: 2017-08-25 发布日期: 2018-05-07

ZTFLH:

TG142.71

基金资助: 河南省产学研合作项目(132107000053)

通讯作者: 王爱琴:通讯作者,女,博士,教授,研究方向为先进复合材料 Tel:0379-64231269 E-mail:aiqin_wang888@163.com

作者简介: 卢盼盼:男,1988年生,硕士研究生,主要从事双相不锈钢研究 E-mail:hkdcailiao@163.com

引用本文:

卢盼盼, 王爱琴, 谢敬佩, 王文焱. 时效处理对4A双相不锈钢σ相析出及性能的影响^*[J]. 《材料导报》期刊社, 2017, 31(16): 76-80.
LU Panpan, WANG Aiqin, XIE Jingpei, WANG Wenyan. Effect of Aging on σ Phase Precipitation and Properties of 4A Duplex Stainless Steel. Materials Reports, 2017, 31(16): 76-80.

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http://www.mater-rep.com/CN/10.11896/j.issn.1005-023X.2017.016.016 或 http://www.mater-rep.com/CN/Y2017/V31/I16/76

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