钼对马氏体不锈钢40Cr13Mo全氢罩式退火氧化皮的影响  

Effect of molybdenum on oxide scale of martensitic stainless steel 40Cr13Mo after full hydrogen batch annealing

作　　者：潘红涛 李照国 张有余 PAN Hongtao;LI Zhaoguo;ZHANG Youyu(Technical Center of Jiuquan Iron and Steel Group Co.,Ltd.,Jiayuguan 735100,China;Stainless Steel Research Institute of Jiuquan Iron and Steel Group Co.,Ltd.,Jiayuguan 735100,China)

机构地区：[1]酒泉钢铁集团公司技术中心,甘肃嘉峪关735100 [2]酒泉钢铁集团公司不锈钢研究所,甘肃嘉峪关735100

出　　处：《冶金分析》2024年第12期78-83,共6页Metallurgical Analysis

摘　　要：本文对同种工艺生产的40Cr13Mo和40Cr13全氢罩式炉退火钢卷氧化皮样品进行了扫描电镜(SEM)、X射线能谱(EDS),以及X射线衍射(XRD)分析。结果表明:由于Mo的添加,40Cr13Mo不锈钢氧化皮较致密、剥落程度低,内部仅存在一些微小的缺陷,局部存在压应力且强度略高于氧化皮强度;与基体结合区域似胶状、且存在“楔形小凸起”钉扎深度0.81μm的2FeO·SiO_(2)(铁橄榄石);存在氧化皮厚度较小但极差较大,与基体结合面不平整的现象;EDS面扫描Cr元素能量分布趋势与O元素能量分布趋势一致,高能级区域占90%以上且分布在氧化皮的中层、里层,10%的中能级区域分布在氧化皮外围,不存在低能级区域,与基体结合区域Si呈连续中能级宽3μm条带、条带上伴有3μm高能级斑块;氧化皮被氢气还原的过程严重滞后,物相以FeCr_(2)O_(4)和FeO两相为主,两者的含量(质量分数,下同)之和达90.2%,Fe、Cr、Cr_(0.7)Fe_(0.3)三相的含量仅为9.6%。The oxide scale samples of full hydrogen batch annealing steel coil of 40Cr13Mo and 40Cr13produced by the same process were analyzed by scanning electron microscopy(SEM),X-ray energy dispersion spectrum(EDS)and X-ray diffraction(XRD).The results showed that the oxide scale of stainless steel 40Cr13Mo was dense with low peeling degree due to the addition of Mo.Only few small defects were observed inside.There was pressure stress in some parts and the strength was slightly higher than that of oxide scale.The bonding regions with matrix were colloidal,and there were“small wedge prominences”of 2FeO·SiO_(2)(fayalite)with pinning depth of 0.81μm.The oxide scale thickness was small but the range was large,and the bonding surface with matrix was uneven.The energy distribution trend of Cr was consistent with O in EDS surface scanning.The high-level regions accounted for above 90%,which were distributed in middle and lining of oxide scale.The middle-level regions of 10%were distributed in periphery of oxide scale,and there were no low-level regions.In the bonding regions with matrix,Si showed continuous middle-level stripes with width of 3μm,and there were 3μm high-level spots in stripes.The reduction process of oxide scale with hydrogen lagged behind seriously.The phases were mainly FeCr_(2)O_(4)and FeO.Their contentsaccounted for 90.2%(mass fraction,the same above),and the contents of Fe,Cr and Cr_(0.7)Fe_(0.3)were only 9.6%.

关 键 词：不锈钢40Cr13Mo 不锈钢40Cr13 钼 全氢罩式退火 氧化皮 微观形貌 微观结构 物相 

分 类 号：O657[理学—分析化学] TG142.71[理学—化学]