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金属学报  2020, Vol. 56 Issue (4): 642-652    DOI: 10.11900/0412.1961.2019.00395
  研究论文 本期目录 | 过刊浏览 |
高强度含NNi奥氏体不锈钢08Cr19Mn6Ni3Cu2N (QN1803)的显微组织及性能
蒋一1,程满浪2,姜海洪1,周庆龙1,姜美雪1,江来珠1(),蒋益明2
1.青拓集团有限公司 宁德 355006
2.复旦大学材料科学系 上海 200433
Microstructure and Properties of 08Cr19Mn6Ni3Cu2N (QN1803) High Strength Nitrogen Alloyed LowNickel Austenitic Stainless Steel
JIANG Yi1,CHENG Manlang2,JIANG Haihong1,ZHOU Qinglong1,JIANG Meixue1,JIANG Laizhu1(),JIANG Yiming2
1.Qing Tuo Group Co. , Ltd. , Ningde 355006, China
2.Department of Materials Science, Fudan University, Shanghai 200433, China
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摘要: 

借助Thermo-Calc热力学相图计算软件,设计了可用于替代06Cr19Ni10 (S30408)的高强度含N节Ni奥氏体不锈钢08Cr19Mn6Ni3Cu2N (QN1803),通过OM、SEM和电化学工作站等方法研究了其组织及性能。结果表明,当固溶温度从1040 ℃升至1120 ℃时, QN1803钢的晶粒尺寸均小于S30408,两者平均晶粒尺寸之差由1.8 μm提高至16.27 μm。N原子起到细晶和固溶强化的作用,使QN1803钢的屈服强度提高至400 MPa以上,达到S30408钢的1.3倍;N原子降低了奥氏体不锈钢的低温韧性,使QN1803钢在-60 ℃以下的冲击功显著低于S30408钢。经600~900 ℃敏化处理后,QN1803钢沿晶界析出富Cr的碳化物,析出的鼻尖温度为800 ℃;由于N原子抑制碳化物的形核和长大,QN1803钢发生晶间腐蚀需要更长的敏化时间,在700 ℃敏化处理时,QN1803钢发生晶间腐蚀所需要的时效时间是S30408钢的2倍。与S30408钢相比,QN1803钢钝化膜的N和Cr元素含量更高;QN1803钢属于稳态奥氏体不锈钢,具有与S30408钢相近的点蚀速率(4.72 g/(m2·h))和更高的点蚀电位(327 mV);经60%冷轧压下变形后,QN1803钢的耐点蚀能力是S30408钢的1.15倍,制品应力开裂风险更低。由于添加了1.65%的Cu元素,使 QN1803钢在5%H2SO4腐蚀溶液中,表面可生成一层保护基体的富铜膜,从而使其在稀H2SO4溶液中的耐腐蚀能力达到S30408钢的6.6倍。

关键词 节Ni奥氏体不锈钢高强度稳态奥氏体力学性能耐腐蚀性能    
Abstract

Nickel is a very important material, yet the resources are deficient. 08Cr19Ni10 (S30408) steel is expensive with containing 8% (mass fraction) nickel and has a low strength, while low nickel austenitic stainless steel has poor corrosion resistance property.In order to save nickel resources, the strength of austenitic stainless steel was improved by partly replacing Ni with Mn and N on the basis of ensuring that the corrosion is as well as S30408, 08Cr19Mn6Ni3Cu2N (QN1803) high strength nitrogen alloyed low nickel austenitic stainless steel was designed by Thermo-Calc software in place of S30408 steel. Microstructures, mechanical and corrosion resistant properties of QN1803 steel were investigated by means of OM, SEM, electrochemistry workstation and other methods. The results reveal the grain size of QN1803 steel is smaller than that of S30408, and difference of average grain size is increased from 1.8 μm to 16.27 μm with temperature rising from 1040 ℃ to 1120 ℃. Yield strength of QN1803 steel is increased to more than 400 MPa, and is 1.3 times than that of S30408 steel for nitrogen playing a role of grains refining and solution reinforcing. The impact energy of QN1803 steel is significantly lower than that of S30408 steel for nitrogen atoms reducing low temperature toughness of nitrogen alloyed austenitic stainless steel below -60 ℃. After 600~900 ℃ temperature ageing, chromium-rich carbideparticles first occur in grain boundaries, nose temperature of precipitation phase is 800 ℃; the inter-granular corrosion of QN1803 steel need more ageing time than S30408 steel, because nitrogen atoms can impede nucleation and growth of carbides, inter-granular corrosion of QN1803 steel is occured with double ageing time of S30408 steel at ageing temperature 700 ℃. Compared with S30408 steel, the passivation film depth of QN1803 steel has higher content of nitrogen and chromium; QN1803 steel has similar pitting corrosion rate (4.72 g/(m2·h)) and more stable austenitic microstructure and higher corrosion potential (327 mV); the pitting resistance of QN1803 steel is 1.15 times than that of S30408 steel with 60% cold reduction, and products have lower risk of stress cracking than S30408 steel. Due to addition of 1.65%Cu element improving corrosion resistance capability in dilute sulfuric acid solution, the surface of QN1803 steel can be enriched with a layer of copper-rich film protecting substrate, as a result, its corrosion resistance reaches 6.6 times than that of S30408 steel in 5% dilute sulfuric acid solution.

Key wordslow nickel austenitic stainless steel    high strength    stable austenite    mechanical property    corrosion resistant property
收稿日期: 2019-11-19     
ZTFLH:  TG142.1  
基金资助:福建省科技重大专项专题项目(2017HZ0001-3)
通讯作者: 江来珠     E-mail: jianglaizhu@outlook.com
Corresponding author: Laizhu JIANG     E-mail: jianglaizhu@outlook.com
作者简介: 蒋 一,男,1988年生,硕士

引用本文:

蒋一,程满浪,姜海洪,周庆龙,姜美雪,江来珠,蒋益明. 高强度含NNi奥氏体不锈钢08Cr19Mn6Ni3Cu2N (QN1803)的显微组织及性能[J]. 金属学报, 2020, 56(4): 642-652.
Yi JIANG, Manlang CHENG, Haihong JIANG, Qinglong ZHOU, Meixue JIANG, Laizhu JIANG, Yiming JIANG. Microstructure and Properties of 08Cr19Mn6Ni3Cu2N (QN1803) High Strength Nitrogen Alloyed LowNickel Austenitic Stainless Steel. Acta Metall Sin, 2020, 56(4): 642-652.

链接本文:

https://www.ams.org.cn/CN/10.11900/0412.1961.2019.00395      或      https://www.ams.org.cn/CN/Y2020/V56/I4/642

SteelCSiMnCrNiMoCuNFe
08Cr19Mn6Ni3Cu2N (QN1803)0.0680.466.2018.203.010.121.650.241Bal.
06Cr19Ni10 (S30408)0.0400.451.0218.208.020.100.100.045Bal.
表1  08Cr19Mn6Ni3Cu2N和06Cr19Ni10奥氏体不锈钢的化学成分 (mass fraction / %)
图1  通过Thermo-Calc计算的QN1803和 S30408钢的相图
图2  QN1803和 S30408钢在Schaeffler-Delong图中的分布
图3  固溶温度对QN1803和S30408钢晶粒尺寸的影响

Steel

Hardness

HV

Tensile strength

MPa

Yield strength

MPa

Elongation

%

Yield ratio

QN1803215755425510.56
S30408165680285580.42
表2  QN1803和S30408钢的室温力学性能
图4  N含量对奥氏体不锈钢屈服强度和延伸率的影响
图5  QN1803和S30408钢不同温度下力学性能对比
图6  QN1803和S30408钢的冲击功对比
图7  冷变形对QN1803和S30408钢磁性相含量和相对磁导率的影响
图8  时效处理对QN1803钢显微组织的影响
图9  QN1803钢中碳化物析出曲线
图10  QN1803钢经900 ℃保温5 h后析出相的EPMA像及EDS分析
TemperatureAgeing time / min
5103060120300
600-0.080.120.130.300.80
650-0.130.772.122.314.69
7000.360.752.563.694.275.36
750-0.512.443.455.024.07
800-0.120.250.350.400.31
表3  QN1803钢不同敏化条件下电流比Ra (Ir/Ia)测试结果 (%)
图11  QN1803和S30408 钢热处理温度-时间-晶间腐蚀敏感性(TTS)曲线对比
图12  不同点蚀当量的奥氏体不锈钢的点蚀电位对比

Steel

Self-corrosive

potential / mV

Pitting potential

mV

Corrosion rate / (g·m-2·h-1)
In 6%FeCl3+0.16%HClIn 5%H2SO4In 5%HCl
QN1803-883274.7248.750.39
S30408-1102984.96321.641.98
表4  QN1803和S30408不锈钢的耐腐蚀性能对比
图13  QN1803和S30408钢表层合金元素分布
图14  Cr、N元素在QN1803和S30408钢表层的分布
图15  QN1803和S30408不锈钢的极化曲线对比
图16  QN1803和S30408钢经5%H2SO4溶液腐蚀6 h后表面形貌的EPMA像
图17  拉深制品在0.16%HCl+6%FeCl3溶液浸泡24 h后宏观形貌
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