粉末冶金多孔高氮奥氏体不锈钢的制备及性能

doi:10.11901/1005.3093.2018.540

材料研究学报

2019, Vol. 33

Issue (5): 345-351 DOI: 10.11901/1005.3093.2018.540

研究论文

本期目录 | 过刊浏览

粉末冶金多孔高氮奥氏体不锈钢的制备及性能

胡玲¹,李烈军¹(

),彭翰林²,倪东惠¹,陈松军¹,张伟鹏¹

1. 华南理工大学国家金属材料近净成形工程技术研究中心广州 510640
2. 华中科技大学材料成形与模具技术国家重点实验室武汉 430074

Fabrication and Properties of Powder Metallurgical Porous High Nitrogen Austenitic Stainless Steel

Ling HU¹,Liejun LI¹(

),Hanlin PENG²,Tungwai NGAI¹,Songjun CHEN¹,Weipeng ZHANG¹

1. National Engineering Research Center of Near-net-shape Forming Technology for Metallic Materials, South China University of Technology, Guangzhou 510640, China
2. State Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, China

引用本文:

胡玲,李烈军,彭翰林,倪东惠,陈松军,张伟鹏. 粉末冶金多孔高氮奥氏体不锈钢的制备及性能[J]. 材料研究学报, 2019, 33(5): 345-351.
Ling HU, Liejun LI, Hanlin PENG, Tungwai NGAI, Songjun CHEN, Weipeng ZHANG. Fabrication and Properties of Powder Metallurgical Porous High Nitrogen Austenitic Stainless Steel[J]. Chinese Journal of Materials Research, 2019, 33(5): 345-351.

全文: PDF(10542 KB) HTML

摘要:

采用粉末冶金方法制备了多孔高氮奥氏体不锈钢并研究其力学性能和耐腐蚀性能。结果表明，高温气固渗氮能促进双相不锈钢向奥氏体不锈钢的转变，在其显微组织中出现了细条状和颗粒状CrN相析出物。随着造孔剂含量的提高孔隙率随之提高，而力学性能和耐腐蚀性能降低。与普通的多孔不锈钢相比，这种多孔高氮奥氏体不锈钢的力学性能更加优越，源于N的固溶强化和CrN等析出物的强化机制。随着孔隙率的提高多孔高氮奥氏体不锈钢的腐蚀倾向和腐蚀速率逐渐增大，造孔剂含量(质量分数)为10%的试样具有最佳的耐腐蚀性能。提高烧结温度有利于烧结块体的致密化，使腐蚀速率明显下降。

关键词 ：金属材料, 高氮奥氏体不锈钢, 粉末冶金, 多孔, 力学性能, 耐腐蚀性能

Abstract：

Porous high-N austenitic stainless steel was fabricated via powder metallurgy and its microstructure and properties were investigated. Results show that high temperature nitridation process promotes the phase transformation of the stainless steel from duplex phase to austenitic phase. Precipitations with different morphologies were observed in the microstructure. XRD results and TEM results identified that both the two precipitates with different morphologies are all CrN phase. With the increasing pore-forming agent the porosity of the prepared alloy increased, which could result in degradation of mechanical properties and corrosion resistance. The superior mechanical property of porous alloys fabricated by this method might be ascribed to the effect of solid solution strengthening of the solute N and precipitation strengthening of nitrides. With the increasing porosity, both of the corrosion tendency and corrosion rate increased for the as-fabricated porous high-N austenitic stainless steel. Among others, the alloy with 10% (mass fraction) pore former exhibits the best corrosion resistance. Besides, the increase of sintering temperature can enhance the densification of the as-prepared alloy, thus improves its corrosion resistance.

Key words： metallic materials high nitrogen austenitic stainless steel powder metallurgy porous mechanical properties corrosion resistance

收稿日期: 2018-09-06

ZTFLH:

TG142

基金资助:国家自然科学基金(51674124)

作者简介: 胡玲，女，1991年生，博士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2018.540 或 https://www.cjmr.org/CN/Y2019/V33/I5/345

图1 原始粉末的SEM形貌和粉末颗粒的直径分布

表 1 样品编码以及详细的工艺参数

图2 烧结温度为1200℃的三种不同孔隙率试样的SEM显微组织

图3 多孔高氮奥氏体不锈钢的XRD图谱和Fe-17.5Cr-10.85Mn-3.4Mo-xN材料体系的Thermo-Calc计算相图

图4 试样N1120-30-374中颗粒状析出物的形貌以及选区电子衍射图谱、TEM-EDS能谱图、细长条状析出物的形貌以及选区电子衍射图谱和TEM-EDS能谱图

表2 各试样的孔隙率和力学性能

图5 孔隙率和烧结温度对多孔高氮奥氏体不锈钢在浓度为0.9%的NaCl溶液中极化曲线的影响

Sample codes	E_corr/V	I_corr/mA·cm^-2	R_p/ $Ω$ ·cm²	b_a/V·dec^-1	b_c/V·dec^-1	Corrosion rate/mm·a^-1
N1120-10-374	-0.757	0.001	3742.0	0.142	0.148	0.007
N1120-20-374	-0.851	0.153	130.4	0.374	0.303	0.277
N1120-30-374	-0.886	0.262	93.4	0.209	0.169	2.211
N1120-40-374	-0.985	0.497	105.5	0.185	0.169	4.817
N1200-30-374	-0.832	0.233	115.0	0.196	0.174	1.641
N1250-30-374	-0.869	0.067	209.4	0.086	0.087	0.416

表3 多孔高氮不锈钢在0.9%的NaCl溶液中极化后的电化学参数

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