| 引用本文: | （英）李小英， 田林海， 窦文博， 林开杰， （英）董汉山.经济型双相不锈钢的离子氮化及其组织结构和腐蚀磨损性能[J].中国表面工程,2015,28(3):1~9 |
| LI Xiaoying, TIAN Linhai, DOU Wenbo, LIN Kaijie, DONG Hanshan.Microstructure and Corrosion Wear Resistance of Plasma Nitrided LDX2101 Lean Duplex Stainless Steel[J].China Surface Engineering,2015,28(3):1~9 |
|
| 摘要: |
| 经济型双相不锈钢以其低廉价格、良好的力学及耐蚀性能的综合优势受到重视，但其硬度低，抗磨性能较差，限制了该合金的广泛应用。对LDX2101经济型双相不锈钢在390 ℃到480 ℃温度区间和25% N2 + 75% H2气氛中离子氮化10 h，研究了氮化改性层的组织结构、机械性能、耐蚀性以及干摩擦和腐蚀磨损性能。结果表明，离子氮化后可在LDX2101表面形成一层具有一定硬度的致密氮化层，氮化层厚度随处理温度升高由5 μm 增加到 28 μm。表面原奥氏体和铁素体晶粒氮化后分别转化为S相 (γN)和针状ε相镶嵌其中的氮在铁素体中的过饱和相αN。氮化后LDX2101的表面硬度最高可提高4倍以上，干摩擦条件下的磨损量可降低3个数量级以上。干摩擦条件下氮化层的耐磨性取决于氮化层硬度和厚度，而在腐蚀介质中的磨损性能与氮化层耐蚀性相关。研究证明只有低温离子氮化（≤420 ℃）可提高LDX2101的腐蚀磨损性能。 |
| 关键词: 经济型 双相不锈钢 离子氮化 组织结构 腐蚀 磨损 |
| DOI：10.11933/j.issn.1007-9289.2015.03.001 |
| 分类号: |
| 基金项目: |
|
| Microstructure and Corrosion Wear Resistance of Plasma Nitrided LDX2101 Lean Duplex Stainless Steel |
|
LI Xiaoying, TIAN Linhai, DOU Wenbo, LIN Kaijie, DONG Hanshan
|
|
School of Metallurgical and Materials, University of Birmingham, Birmingham B15 2TT, UK
|
| Abstract: |
| Lean duplex stainless steels are valued for its hybrid advantages of low cost, and good mechanical and corrosion resistance properties. However, the low hardness and poor wear resistance of alloys limited their widespread applications. In this work, LDX2101 lean duplex stainless steel was plasma nitrided (PN) for 10 hours at temperatures ranging from 390 ℃ to 480 ℃ in a gas mixture of 25% N2 + 75% H2. The microstructures, mechanical properties, corrosion resistance, dry and corrosion wear resistance of the nitrided layers were investigated. The results showed that a hard and compact case can be generated by PN on the LDX2101 steel surface. The thickness of the nitrided layer increased with the treatment temperatures ranging from 5 μm to 28 μm. The original austenite and ferrite grains on the surface of LDX2101 are transferred respectively into Sphase (γN) and nitrogen saturated ferrite (αN) with εFe3N needles. The surface hardness of LDX2101 can be improved by about 4 times and the dry wear area loss can be decreased by more than three orders of magnitude after nitriding. The dry wear resistance of the nitrided layer depends on the hardness and thickness of the layer, while the corrosionwear property is closely related to the corrosion resistance of the layer. It is found that low temperature (≤420 ℃) plasma nitriding could effectively improve the corrosionwear property of LDX2101 steel. |
| Key words: lean duplex stainless steel plasma nitriding microstructure corrosion wear |
