氮气压强对区熔12Cr21Ni5Ti双相不锈钢包晶转变及性能的影响  

Effect of Nitrogen Pressure on the Peritectic Transformation and Properties of 12Cr21Ni5Ti Duplex Stainless Steel During Zone Melting

作　　者：刘沉 李再久[2] 金青林[1] LIU Chen;LI Zai-jiu;JIN Qing-lin(College of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan,China;College of Civil Aviation and Aviation,Kunming University of Science and Technology,Kunming 650093,Yunnan,China)

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]昆明理工大学民航与航空学院,云南昆明650093

出　　处：《铸造》2022年第3期296-301,共6页Foundry

基　　金：国家自然科学基金(51964030,51464026)。

摘　　要：采用高压区域熔炼增氮工艺制备了12Cr21Ni5TiN双相不锈钢。研究了高压区熔增氮工艺中的氮气压力对含氮双相不锈钢包晶转变及性能的影响。结果表明,随着氮气压力升高,试样中的氮含量由0升高到0.19wt%,奥氏体体积分数由39.44%升高到69.03%。在包晶转变过程中,随着氮含量的增加,液相(L)转变为奥氏体相(γ)的比率上升,而铁素体相(δ)转变为奥氏体相(γ)的比率下降。区熔增氮能够提高屈服强度、加工硬化指数及耐晶间腐蚀性能。12Cr21Ni5TiN duplex stainless steel was prepared by high pressure zone melting nitriding process.The effect of nitrogen pressure on peritectic transformation and properties of the nitrogen-containing duplex stainless steel in high pressure zone nitriding process was studied.The results showed that with the increase of the nitrogen pressure,the nitrogen content in the sample increased from 0 to 0.19wt%,and the austenite volume fraction increased from 39.44%to 69.03%.During peritectic transformation,with the increase of the nitrogen content,the ratio of the liquid phase(L)to austenite phase(γ)increased,and the ratio of the ferrite phase(δ)to the austenite phase(γ)dropped.The mechanical properties and intergranular corrosion tests showed that the yield strength,work hardening index of the sample increased with the increase of the nitrogen pressure,which means that the nitrogen can effectively improve the compression properties of the sample.Moreover,the nitrogen also can effectively improve the intergranular corrosion resistance of the duplex stainless steel.

关 键 词：区域熔炼 含氮双相不锈钢 包晶转变 压缩性能 腐蚀性能 

分 类 号：TG142.7[一般工业技术—材料科学与工程]