CAJ | 학술논문

通过对0Cr13铁素体不锈钢丝的化学成分、显微组织、开裂形貌及夹杂物的分布等进行分析,以找到其在模压过程中发生开裂的原因.结果表明：该不锈钢丝的化学成分异常,碳含量较高,铬、锰含量较低；不锈钢丝中存在数量较多的碳化物和聚集分布的夹杂物,碳化物的尺寸为0．3~0．8μm,呈暗灰色颗粒状,夹杂物的尺寸为15~25μm,主要为氧化物、钙镁酸盐及硅酸盐；模压前,不锈钢丝已发生强烈的塑性变形,碳化物在晶界处塞积,组织不均匀,夹杂物与基体的交界处存在应力集中；模压过程中,材料发生塑性失稳,裂纹起源于夹杂物导致的应力集中区域,并向内部扩展,最终导致不锈钢丝发生开裂.
통과대0Cr13철소체불수강사적화학성분、현미조직、개렬형모급협잡물적분포등진행분석,이조도기재모압과정중발생개렬적원인.결과표명：해불수강사적화학성분이상,탄함량교고,락、맹함량교저；불수강사중존재수량교다적탄화물화취집분포적협잡물,탄화물적척촌위0．3~0．8μm,정암회색과립상,협잡물적척촌위15~25μm,주요위양화물、개미산염급규산염；모압전,불수강사이발생강렬적소성변형,탄화물재정계처새적,조직불균균,협잡물여기체적교계처존재응력집중；모압과정중,재료발생소성실은,렬문기원우협잡물도치적응력집중구역,병향내부확전,최종도치불수강사발생개렬.
To find the cracking causes of 0Cr13 ferrite stainless steel wire during die pressing,chemical composition,microstructure,cracking morphology and inclusions distribution were analyzed.The results show that the chemical composition of the stainless steel wire was abnormal,and the carbon content was relative high and the content of chromium and manganese were relative low.Quantities of carbides and inclusions with gathering distribution existed in the stainless steel wire,the size of dark gray granular carbides was 0.3-0.8μm,the size of inclusions was 15-25μm,and the main inclusions were oxides,calcium-magnesium carbonate and silicate.Severe plastic deformation appeared in the stainless steel wire before die pressing,carbides piled up at grain boundaries, microstructure was inhomogeneous,and stress construction existed at the j unction of inclusions and the substrate. During die pressuring,plastic instability happened,cracks originated from the stress concentration area caused by inclusions,and then expanded to interior and eventually resulted in the stainless steel wire cracking.