| 摘要: |
| 针对大型装备现场增材修复与再制造的需要，设计制备了一种集约化双相不锈钢粉末，用于Q345、Q460以及EQ56等海工结构钢和18-8等奥氏体不锈钢大型承力部件现场修复。采用99.999%高纯氮气保护在Q345和1Cr18Ni9Ti基材上制备了激光成型试样，采用试验方法研究了试样的组织结构、力学性能、电化学性能和氮含量的变化规律。结果表明：采用高纯氮气保护，可以制备出含氮的双相不锈钢成型层，成型层中奥氏体和铁素体晶粒分布较均匀，氮含量比粉末中氮含量下降了45%。试样抗拉强度为940~1040 MPa，屈服强度为800~910 MPa，断后延伸率为21%~25%，显微硬度为275~285 HV0.1。在20 Hz交变载荷、试验应力范围330~600 MPa的试验条件下，成型试样的平均断前循环次数大约为标准冷轧棒材1Cr18Ni9Ti的7倍。磨损量分别为基材Q345和1Cr18Ni9Ti的0.3和0.5倍。试样腐蚀电位比1Cr18Ni9Ti增加0.364 V，腐蚀电流密度减少4.34×10-7A/cm2，成型试样有良好的综合性能。 |
| 关键词: 集约化 双相不锈钢 激光成型 综合性能 |
| DOI：10.11933/j.issn.1007-9289.20181107002 |
| 分类号:TG174.44 |
| 基金项目:国家重点研发计划（2018YFB1105800）；国家自然科学基金（51474130） |
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| Mechanical and Corrosion Properties of Nitrogen Bearing Duplex Stainless Steel Sample Prepared by Laser Forming |
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ZHANG Cong1, ZHANG Zhenyuan1, LI Sheng1, QIU Changjun1, ZHU Sheng2
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1.Mechanical Engineering School, University of South China, Hengyang 421000, China;2.National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering, Beijing 100072, China
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| Abstract: |
| To meet the needs of repairing and remanufacturing of large-scale equipment, intensive duplex stainless steel powder was designed. It can be used for repairing those large-scale bearing components of Q345, Q460, EQ56 and 18-8 austenitic stainless steel. The laser formed samples were prepared on Q345 and 1Cr18Ni9Ti substrates under the protection of 99.999% high-purity nitrogen. The microstructure, mechanical properties, electrochemical properties and the contents of nitrogen in the samples were carefully investigated. Results show that the laser formed layers of nitrogen-bearing duplex stainless steel is prepared under the protection of high-purity nitrogen. The austenite and ferrite distribute uniformly in the samples, and the nitrogen content in the formed layers is approximately 45% lower than that in the powder. The tensile strength, yield strength, elongation and microhardness of the samples is in the range of 940-1040 MPa, 800-910 MPa, 21%-25%, and 275-285 HV0.1, respectively. Under the testing condition with an alternating load of 20 Hz, stress of 330~600 MPa, the average cycles of the formed samples are about 7 times that of the standard cold-rolled bar of 1Cr18Ni9Ti. The wear volume of the formed samples is 0.3 and 0.5 times of the substrate Q345 and 1Cr18Ni9Ti, respectively. The corrosion potential of the formed samples is 0.364 V higher compared to 1Cr18Ni9Ti. The corrosion current density is 4.34×10-7A/cm2, lower than that of 1Cr18Ni9Ti. Generally, the formed sample has good comprehensive properties. |
| Key words: intensification duplex stainless steel laser forming comprehensive properties |
