一种耐磨耐蚀双相合金的组织及性能  

Microstructure and Properties of A Wear and Corrosion Resistant Dual-phase Alloy

作　　者：谢君 王道红[1] 刘金灿 张鹏 侯桂臣 XIE Jun;WANG Daohong;LIU Jincan;ZHANG Peng;HOU Guichen(Jiangsu Feiyue Machine&Pump Gruop Co.,Ltd.,Jingjiang 214536,China;Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]江苏飞跃机泵集团有限公司,江苏靖江214536 [2]中国科学院金属研究所,辽宁沈阳110016

出　　处：《热加工工艺》2023年第4期47-50,共4页Hot Working Technology

基　　金：2018年度泰州市高层次创新创业人才引进计划项目(2018);国家自然科学基金项目(51701212)。

摘　　要：设计并制备一种耐磨耐蚀双相合金,并对其物相组成、组织结构、硬度、耐磨及耐蚀性进行研究。对该合金的动电位极化曲线进行测试。结果表明,该合金主要由σ-Cr_(13)Ni_(5)Si_(2)相及γ相两相构成。其中,在枝晶干区域,细小的γ相弥散分布于σ相中,形成花瓣状结构;在枝晶间区域,尺寸较大的γ相与光滑的σ相相间排列,两相的体积分数基本相同。该合金在室温下的平均洛氏硬度为60.9HRC,平均维氏硬度为513HV。往复摩擦测试期间,合金的平均摩擦系数约为0.305,其中,枝晶间区域的γ相首先发生磨损变形,并导致σ相碎裂是合金的主要磨损机制。该合金的腐蚀电位约为-0.296V、维钝电流密度为1.027×10^(-5) A·cm^(-2)。枝晶干内弥散分布的细小γ相周围的电位差随电位升高积累缓慢,是合金在测试期间出现二次钝化现象的主要原因。By means of designing and preparing a wear and corrosion-resistant dual-phase Cr_(13)Ni_(5)Si_(2) alloy,the phase composition,microstructure,hardness,wear-resistant and corrosion-resistant of the alloy were studied.The results show that the alloy is mainly composed byσ-Cr_(13)Ni_(5)Si_(2) phase andγphase.In the dendrite area,fine dispersedγphase particles are well distributed in theσphase,which is shown as the petal structure.In the inter-dendrite area,theγphases with big size alternate with the smoothσphase,and the volume fractions ofσandγphase are almost the same.The average rockwell hardness of the alloy is about 60.9 HRC,and the average Vickers hardness is about 513HV.During the reciprocating friction test,the average friction coefficient of the alloy is about 0.305.Theγphase in the inter-dendrite area firstly generates wear deformation and results in the fracture of theσphase,which is thought to be the main wear mechanism of the alloy.The corrosion potential of the alloy is about-0.296 V,and the passivation current density is about 1.027×10^(-5) A·cm^(-2).The potential difference around the fine dispersed distributedγphase in the dendrite area accumulates slowly with the increase of the potential,which is the main reason for the appearance of the secondary passivation of the alloy during the potentiodynamic polarization curve test.

关 键 词：双相合金 组织结构 摩擦系数 耐蚀性 

分 类 号：TG142.7[一般工业技术—材料科学与工程]