捆扎丝用钢连续冷却过程中的相变规律及组织研究  

Study on Phase Transformation Law and Microstructure of Packaging Wire Steel during Continuous Cooling

作　　者：徐士新 王坤 杨胜其 韩伟[3] 田振江 孙齐松 XU Shixin;WANG Kun;YANG Shengqi;HAN Wei;TIAN Zhenjiang;SUN Qisong(Research Institute of Technology,Shougang Group Co.,Ltd.,Beijing 100043,China;Shandong Liaojian 8th Construction Co.,Ltd.,Liaocheng 252001,China;Shougang Tonghua Iron and Steel Group Co.,Ltd.,Tonghua 134003,China;Shandong Chenlin Machinery Co.,Ltd.,Jining 272073,China)

机构地区：[1]首钢集团有限公司技术研究院,北京100043 [2]山东聊建第八建设有限公司,山东聊城252001 [3]首钢通化钢铁集团股份有限公司,吉林通化134003 [4]山东辰林机械有限公司,山东济宁272073

出　　处：《热加工工艺》2024年第4期102-106,共5页Hot Working Technology

基　　金：国家新材料生产应用示范平台建设项目—农机装备材料生产采用示范平台项目(TC200H01X-5)。

摘　　要：为消除捆扎丝用钢拉拔过程中出现的竹节现象,减少硬相组织的影响,提高组织的均匀性,采用热模拟试验研究了不同冷却速率条件下捆扎丝用钢的相变情况,结合组织形貌绘制了连续冷却相变曲线。结果表明,捆扎丝用钢经历热变形后,随冷却速率的增加,钢中铁素体及大块珠光体尺寸逐渐减小,但减小的趋势逐渐减弱,特别是当冷却速率大于5℃/s时,铁素体、珠光体尺寸变化不大。通过数据统计拟合,在冷却速率小于30℃/s范围内,建立了捆扎丝用钢连续冷却过程中铁素体晶粒尺寸d与冷却速率v的关系,表达式为d=35.56+6.59 ln(1/v)。In order to eliminate the bamboo joint phenomenon in the drawing process of packaging wire steel,reduce the influence of hard phase structure and improve the uniformity of structure,the phase transformation of packaging wire steel under different cooling rates was studied by thermal simulation machine,and the continuous cooling transformation curves were drawn combined with the microstructure morphology.The results show that the size of ferrite and pearlite decreases with the increase of cooling rate after thermal deformation,but the decreasing trend is gradually weakened,especially when the cooling rate is greater than 5℃/s,the size of ferrite and pearlite changes little.Through statistical fitting of data,when the cooling rate is less than 30℃/s,the relationship between ferrite grain size d and cooling rate v during continuous cooling of packaging wire steel is established,and the expression is d=35.56+6.59 ln(1/v).

关 键 词：捆扎丝 连续冷却 相变规律 组织 竹节现象 

分 类 号：TG161[金属学及工艺—热处理]