冷轧带钢渗氮铁锅开裂剥落原因分析及改进措施  

Reason analysis and improvement measures for cracking and spalling of nitriding iron pot for cold rolled strip steel

作　　者：邱香花[1] 张全庆[1] 胡桂英[1] 戴扭乾 周启航 QIU Xianghua;ZHANG Quanqing;HU Guiying;DAI Niuqian;ZHOU Qihang(Xinyu Iron and Steel Group Co.,Ltd.,Xinyu 338001,China)

机构地区：[1]新余钢铁集团有限公司,新余338001

出　　处：《江西冶金》2024年第4期303-308,共6页Jiangxi Metallurgy

摘　　要：在采用某公司生产的厚度为1 mm的XLQ01冷轧带钢制作铁锅的过程中,经渗氮处理后出现开裂问题,铁锅经碰撞后渗氮层易剥落。本研究采用扫描电子显微镜、直读光谱仪、金相显微镜等检测手段对渗氮铁锅样品的断口微观形貌、化学成分、金相组织及原材料的表面粗糙度、化学成分、金相组织、晶粒度进行分析,结果表明,渗氮铁锅开裂剥落的原因主要有以下两个方面:一方面,渗氮开裂样品中存在粗大的原始组织和穿晶分布的针状氮化物,破坏了基体的连续性,增加了表面层脆性及切口敏感性,在外力作用下导致开裂;另一方面,原材料表面粗糙度大,渗氮温度高,渗氮层疏松,在压应力作用下导致渗氮层开裂剥落。本研究针对渗氮铁锅开裂剥落的原因提出了相应的改进措施,有效避免了渗氮铁锅开裂剥落。In the process of making iron pots using XLQ01 cold-rolled strip steel with a thickness of 1 mm produced by a company,cracking problems occurred after nitriding treatment,and the nitriding layer of iron pots was easy to peel off after collision.In this study,scanning electron microscope,direct-reading spectrometer,metallurgical microscope and other detection methods were used to analyze the microstructure,chemical composition,metallographic structure,and surface roughness,chemical composition,metallographic structure,and grain size of nitriding iron pot samples.The results showed that the main reasons for the cracking and spalling of nitriding iron pots are as follows:on the one hand,the presence of coarse original structure and needle like nitrides with transgranular distribution in the nitriding cracked samples disrupts the continuity of the matrix,and increases the brittleness of the surface layer and sensitivity to notches,leading to cracking under external forces;on the other hand,the surface roughness of raw materials is large,the nitriding temperature is high,and the nitriding layer is loose,which leads to cracking and spalling of the nitriding layer under compressive stress.In this study,corresponding improvement measures are proposed to address the causes of cracking and peeling in nitriding iron pots,which effectively avoid the cracking and spalling.

关 键 词：冷轧带钢 渗氮铁锅 开裂 剥落 

分 类 号：TG156.82[金属学及工艺—热处理]