V含量对高氮马氏体不锈钢组织及性能的影响
Effect of V content on microstructure and properties of high nitrogen martensitic stainless steel
张浩 1迟宏宵 2王成蹊 3马党参 2林鹏4
作者信息
- 1. 昆明理工大学材料科学与工程学院,云南昆明 650093;钢铁研究总院有限公司特殊钢研究院,北京 100081;山东南山铝业股份有限公司,山东龙口 265700
- 2. 钢铁研究总院有限公司特殊钢研究院,北京 100081
- 3. 昆明理工大学交通工程学院,云南昆明 650093
- 4. 河北机电职业技术学院,河北邢台 054000
- 折叠
摘要
采用光学显微镜、SEM、硬度试验、冲击试验、盐雾腐蚀试验对两种不同V含量(0.32％和0.80％)的高氮马氏体不锈钢(根据V含量分别命名为0.3V钢和0.8V钢)的组织和力学性能进行研究.结果表明,两种不同V含量试验钢的退火组织中均出现碳化物条带,0.8V钢中碳化物条带更加明显,其退火硬度为257.0 HBS,相较于0.3V钢提高7％;V含量的提高能降低淬火后奥氏体晶粒的尺寸和残留奥氏体含量;经相同热处理(1050℃淬火30 min+(-73℃)冷处理2 h+250 ℃回火2 h)后,0.3V钢硬度为58.4 HRC,冲击吸收能量为9.4 J,0.8V钢的硬度为54.4 HRC,冲击吸收能量为12.7 J,V含量的增加,降低了马氏体不锈钢的硬度,提高了其韧性;经120 h的盐雾腐蚀后,0.3V钢表面无明显腐蚀坑,腐蚀速率为0.0235 g·m-2·h-1,0.8V钢表面有明显的腐蚀坑,腐蚀速率为0.0258 g·m-2·h-1,0.3 V钢的耐腐蚀性能略优于0.8V钢,即随着V含量增加,耐蚀性略有下降.
Abstract
Microstructure and mechanical properties of the high nitrogen martensitic stainless steels with 0.32％V and 0.80％V(named as 0.3V and 0.8V steels)were studied by means of optical microscope,SEM,hardness test,impact test and salt spray corrosion test.The results show that carbide bands appear in both the two as-annealed steels.For the 0.8V steel,the carbide bands are more pronounced,the annealed hardness is 257.0 HBS,which is 7％higher than that of the 0.3V steel,and the increase of V content can reduce the austenite grain size and retained austenite content after quenching.After the same heat treatment(quenched at 1050 ℃ for 30 min,cryogenic treatment at-73 ℃ for 2 h,and tempered at 250 ℃ for 2 h),the hardness and impact absorbed energy of the 0.3V steel are 58.4 HRC and 9.4 J,respectively,while those of the 0.8V steel are 54.4 HRC and 12.7 J,respectively,which implies that the increase in V content reduces the hardness of the tested steel and improves the toughness.After salt spray corrosion for 120 h,the corrosion rate of 0.3V steel is 0.0235 g·m-2·h-1and there is no obvious corrosion pit on the steel surface,while the corrosion rate of the 0.8V steel is 0.0258 g·m-2·h-1,and there are obvious corrosion pits on the surface,which indicates that the corrosion resistance of the 0.3V steel is slightly better than that of the 0.8V steel,meaning that the corrosion resistance slightly decreases with the increase of V content.
关键词
高氮马氏体不锈钢/V含量/组织/力学性能/耐蚀性Key words
high nitrogen martensitic stainless steel/V content/microstructure/mechanical properties/corrosion resistance引用本文复制引用
出版年
2024
NETL
NSTL
万方数据