氮含量对无镍奥氏体不锈钢力学性能的影响
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摘要
设计并冶炼了氮质量分数为0.02%～1.20%的无镍奥氏体不锈钢,通过力学性能测试和显微组织观察,研究了氮含量对强度、塑性、韧性的影响。结果表明,氮可显著提高屈服强度和抗拉强度。氮质量分数为0.02%～1.20%时,其与屈服强度和抗拉强度的关系基本为线性关系,并获得了其关系式。韧性对氮含量十分敏感,在氮质量分数为0.39%～0.78%时,冲击吸收功较高,均保持在380J;氮含量过高或过低时,韧性都会下降。氮含量对断面收缩率的影响较小,氮质量分数在0.78%以下时均超过了70%;而氮质量分数超过0.78%后,塑性则有所下降。当氮质量分数超过0.60%时,拉伸断口上韧窝尺寸随着氮含量的升高而逐渐减小;GN-12N钢断口上出现了大面积的无韧窝区。
High-nitrogen nickel-free austenitic stainless steel with different nitrogen mass fraction ranging from0.02%to 1.20% were designed and melted.The effect of N on the strength,ductility and toughness were investigated through mechanical properties test and microstructure examination.The results showed that N can significantly improve the yield and ultimate strength.The dependencies of them on the N mass fraction(0.02%-1.20%)were linear,and the corresponding equations were obtained.The toughness was very sensitive to the N content.When the mass fraction of N was in the range 0.39%-0.78%,the impact absorption energy was higher,which was maintained at 380 J.However,the toughness decreased if the N content was too high or too low.The influence of N content on ductility was weak.The reduction in area was more than 70% when the N mass fraction was less than0.78%.The toughness decreased when N mass fraction was above 0.78%.When the N mass fraction exceeded0.60%,the size of dimples on the tensile fracture surface decreased gradually with increasing the N content.Large areas without dimples were observed on the fracture surface of GN-12 Nspecimen.
High-nitrogen nickel-free austenitic stainless steel with different nitrogen mass fraction ranging from0.02%to 1.20% were designed and melted.The effect of N on the strength,ductility and toughness were investigated through mechanical properties test and microstructure examination.The results showed that N can significantly improve the yield and ultimate strength.The dependencies of them on the N mass fraction(0.02%-1.20%)were linear,and the corresponding equations were obtained.The toughness was very sensitive to the N content.When the mass fraction of N was in the range 0.39%-0.78%,the impact absorption energy was higher,which was maintained at 380 J.However,the toughness decreased if the N content was too high or too low.The influence of N content on ductility was weak.The reduction in area was more than 70% when the N mass fraction was less than0.78%.The toughness decreased when N mass fraction was above 0.78%.When the N mass fraction exceeded0.60%,the size of dimples on the tensile fracture surface decreased gradually with increasing the N content.Large areas without dimples were observed on the fracture surface of GN-12 Nspecimen.
引文
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[4]SUN Gui-xun,YU An-wei,SUN Shi-cheng,et al.Plastic deformation and fracture behavior of high-nitrogen nickel-free austenitic stainless steel[J].Materials Science and Technology,2017,33:1635.
[5]LI Hua-bing,JIANG Zhou-hua,SHEN Ming-hui,et al.High nitrogen austenitic stainless steels manufactured by nitrogen gas alloying and adding nitride ferroalloys[J].Journal of Iron and Steel Research,International,2007,14(3):63.
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[8]Sumita M,Hanawa T,Teoh S H.Development of nitrogencontaining nickel-free austenitic stainless steels for metallic biomaterials-review[J].Materials Science and Engineering C,2004,24:753.
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[10]徐海峰,曹文全,俞峰,等.国内外高氮马氏体不锈轴承钢研究现状与发展[J].钢铁,2017,52(1):53.
[11]翁建寅,宁小智,董瀚,等.生物友好不锈钢的生产及在手表产品上的应用[J].物理测试,2016,34(5):12.
[12]SUN Li-yuan,LI Jing-she,ZHANG Li-feng,et al.Production of nitrogen-bearing stainless steel by injecting nitrogen gas[J].Journal of Iron and Steel Research,Internationa,2011,18(11):7.
[13]Gavriljuk V,Petrov Yu,Shanina B.Effect of nitrogen on the electron structure and stacking fault energy in austenitic steels[J].Scripta Materialia,2006,55:537.