时效析出相对铸造2507超级双相不锈钢力学及耐蚀性能的影响

向红亮; 刘东; 何福善; 黄利光; 阮方如

doi:10.3724/SP.J.1037.2010.00143

金属学报 >

2010 , Vol. 46 >Issue 8: 941 - 945

DOI: https://doi.org/10.3724/SP.J.1037.2010.00143

论文

时效析出相对铸造2507超级双相不锈钢力学及耐蚀性能的影响

向红亮 ,
刘东 ,
何福善 ,
黄利光 ,
阮方如

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福州大学机械工程及自动化学院, 福州 350108

向红亮, 男, 1972年生, 副教授

收稿日期: 2010-03-25

修回日期: 2010-05-13

网络出版日期: 2010-08-10

基金资助

科技部科技人员服务企业项目2009GJC40018, 福建省青年人才创新基金项目2008F3061和福州大学科技发展基金项目2008--XQ--16资助

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EFFECTS OF PRECIPITATION FOR AGING ONMECHANICAL AND CORROSION RESISTANCE PROPERTIES OF CAST 2507 SUPER DUPLEX STAINLESS STEEL

XIANG Hong-Liang ,
LIU Dong ,
HE Fu-Shan ,
HUANG Li-Guang ,
YUAN Pang-Ru

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School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350108

Received date: 2010-03-25

Revised date: 2010-05-13

Online published: 2010-08-10

Supported by

Supported by Program for Service of Enterprise by Technical Personnel, the Ministry of Science and Technology of China (No.2009GJC40018), Innovation Foundation for Young Talent of Fujian Province (No.2008F3061) and Technological Development Foundation of Fuzhou University (No.2008–XQ–16)

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摘要

通过OM, SEM以及拉伸实验与电化学测试等手段, 研究了高温时效析出金属间相对铸造2507超级双相不锈钢力学及耐蚀性能的影响. 实验结果表明: 材料固溶后经650-950 ℃时效处理, 析出弥散颗粒χ相有提高抗拉强度的作用,σ相却使抗拉强度急剧下降; 二者均使塑性急剧恶化, 拉伸断口均表现为脆性断裂. 在人工海水中, σ相对材料的耐蚀性影响要比$\chi$相弱,其数量越多, 材料耐蚀性越差.

关键词： 铸造2507超级双相不锈钢; 金属间相; 力学性能; 耐蚀性

本文引用格式

向红亮 , 刘东 , 何福善 , 黄利光 , 阮方如 . 时效析出相对铸造2507超级双相不锈钢力学及耐蚀性能的影响[J]. 金属学报, 2010 , 46(8) : 941 -945 . DOI: 10.3724/SP.J.1037.2010.00143

Abstract

Duplex stainless steel (DSS) has been used widely due to its very excellent combination of mechanical and corrosion resistance properties. However, the use of DSS is limited by their susceptibility to the formation of dangerous intermetallic phases, such as χ phase and phase, resulting in the detrimental effects on mechanical properties and corrosion resistance. With the application of the super duplex stainless steel (SDSS) with a pitting resistance equivalent number more than 40. The harmful effects of intermetallic phases easily precipitated in DSS on mechanical properties and corrosion resistance are a research focus. This paper, based on prior study, investigates the effects of intermetallic phases formed during aging on the mechanical properties and corrosion resistance of cast 2507 super duplestainless steel by means of optical microscope (OM), scanning electron microscope (SEM), tensile test and electrochemical test. The results indicate that for the solution annealing cast 2507 super duplex stainless steel aged in the temperature range 650—950 ℃, small and depressive distribution χ phase precipitatd from ferrite can increase its tensile strength, but σ phase causes the opposing effect on its plasticity owing to precipitated along grain boundaries. Both of them can rapidly deteriorate its plasticity, and cause brittle failure. The effect of σ phase on corrosion resistance of 2507 SDSS is weaker than phase. The more the σ phase is, the worse the corrosion resistant could be.

Key words： cast 2507 super duplex stainless steel; intermetallic phase; mechanical roperty; corrosion resistance

参考文献

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