铌对65SiCrV6弹簧钢氧化增重的影响  

Effects of Nb on oxidation weight gain of 65SiCrV6 spring steel

作　　者：侯清宇 丁敬 廖振成 汪开忠[2] 席波 黄贞益 HOU Qing-yu;DING Jing;LIAO Zhen-cheng;WANG Kai-zhong;XI Bo;HUANG Zhen-yi(School of Metallurgical Engineering,Anhui University of Technology,Ma'anshan 243000,Anhui,China;Ma'anshan Iron and Steel Co.,Ltd.,Ma'anshan 243000,Anhui,China;Special Steel Division,Nanjing Iron and Steel Co.,Ltd.,Nanjing 211500,Jiangsu,China)

机构地区：[1]安徽工业大学冶金工程学院,安徽马鞍山243000 [2]马鞍山钢铁股份有限公司,安徽马鞍山243000 [3]南京钢铁有限公司特钢事业部,江苏南京211500

出　　处：《钢铁》2022年第11期144-156,共13页Iron and Steel

基　　金：安徽省重大科技专项资助项目(201903a05020051)。

摘　　要：铌对Si-Cr-V系弹簧钢强度和脱碳层特征的影响已受到较多关注,但铌对该系弹簧钢氧化增重影响的研究还较少。以65SiCrV6弹簧钢为研究对象,在其中添加质量分数约0.017%的铌(65SiCrV6Nb)。采用SEM+EDS、XRD、TEM、FactSage化学热力学软件、反应扩散理论和数理统计相结合的方法,从研究铌加入是否会对该弹簧钢在炉氧化增重和氧化铁皮物相组成等产生明显影响的角度,对铌加入是否会对该弹簧钢高压水除鳞难易度产生影响进行评价。结果表明,铌的加入提高了锻态65SiCrV6钢中的珠光体和未溶M(C,N)的相对含量,降低了铁素体的相对含量,并细化了组织。在氧气浓度为2%~7%(体积分数)、加热速度为8~20℃/min、保温温度为1050~1150℃和保温时间为60~90 min等工艺条件下,铌的加入使65SiCrV6钢的氧化增重明显提高,提高幅度为2.54%~27.82%且具有统计学意义。影响试验钢在炉氧化增重的主次效应依次为保温温度>保温时间>加热速度>氧气浓度,保温温度和保温时间对试验钢在炉氧化增重的影响为正相关,氧气浓度和加热速度对试验钢在炉氧化增重的影响为负相关。65SiCrV6钢在炉氧化增重达最小值的工艺为氧气浓度为7%、加热速度为14℃/min、保温温度为1050℃和保温时间为60 min;65SiCrV6 Nb钢在炉氧化增重达最小值的工艺为氧气浓度为7%、加热速度为8℃/min、保温温度为1050℃和保温时间为60 min。影响铌对65SiCrV6钢在炉氧化增重提高幅度的主次效应为保温时间>保温温度>加热速度>氧气浓度。铌的加入使65SiCrV6钢在炉氧化增重提高幅度最小的工艺为氧气浓度为2%、加热速度为8℃/min、保温温度为1050℃和保温时间为75 min。由反应扩散控制的氧化固态相变是造成保温温度、保温时间、加热速度和氧气浓度对试验钢在炉氧化增重产生不同影响的主要原因。铌的加入未改变65SiCrV6钢表面氧化铁皮的3层�The influence of Nb on the strength and decarbonization characteristics of Si-Cr-V series spring steels has received more attention,but less study has been focused on effect of Nb on the oxidation weight gain of the series spring steels.One of the Si-Cr-V series spring steels being 65SiCrV6 steel was selected as the research object,in which the mass percent of about 0.017%Nb was added(65SiCrV6 Nb).Using a combination of SEM+EDS,XRD,TEM,FactSage chemical thermodynamics software,diffusion theory,and mathematical statistics,it would be evaluated whether the addition of Nb in 65SiCrV6 steel would affect the ease of high-pressure water descaling of the steel from the perspective of researching whether the addition of Nb would have an obvious influence on oxidation weight gain and phase composition of iron oxide scales.The results show that the addition of Nb increased the relative content of pearlite and undissolved M(C,N)in 65SiCrV6 steel,reduced the relative content of ferrite,refined the as-forged microstructure of the steel.Under experimental conditions such as the oxygen concentration of 2%-7%(volume percent),the heating rate of 8-20℃/min,the holding temperature of 1050-1150℃,and the holding time of 60-90 min,the addition of Nb increased the oxidation weight gain of 65SiCrV6 steel obviously,and the increase range was about 2.54%-27.82%,which was statistically significant.The main and second effects that affect in-furnace oxidation weight gain of the experimental steels were holding temperature>holding time>heating rate>oxygen concentration.The effects of holding temperature and holding time on in-furnace oxidation weight gain of the experimental steels were positively correlated;the effects of oxygen concentration and heating rate on in-furnace oxidation weight gain of the experimental steels were negatively correlated.The process for 65SiCrV6 steel to reach the minimum in-furnace oxidation weight gain was oxygen concentration of 7%,heating rate of 14℃/min,holding temperature of 1050℃,and holding time of

关 键 词：弹簧钢 铌 氧化增重 数理统计 反应扩散 Fe_(2)SiO_(4) 高压水除鳞 

分 类 号：TG142.1[一般工业技术—材料科学与工程]