期刊论文

Mechanical and Corrosion Properties of Nitrogen Bearing Duplex Stainless Steel Sample Prepared by Laser Forming

中文

中国表面工程

1007-9289

2019

32

2

163-169

10.11933/j.issn.1007-9289.20181107002

国家重点研发计划(2018YFB1105800) 国家自然科学基金(51474130).

本校为第一机构

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,成型层中奧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 MP...

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 lase...