摘要
通过对热轧304不锈钢沿轧制方向和宽度方向进行划痕试验,对氧化皮剥落过程及界面结合强度进行了研究。采集了划痕过程中的声发射信号和摩擦因数,结合氧化皮破裂过程中的显微形貌,测定了内外氧化层间以及氧化皮与基体间的界面结合力,分析比较了沿不同方向层间及界面结合强度的差异,计算得出氧化皮的界面结合强度。结果表明,氧化皮为两层结构,造成在划痕试验过程中声发射信号发生2次突变,摩擦因数也分为3个阶段。受残余应力影响,临界载荷沿宽度方向比沿轧制方向大。结果还表明,沿轧制方向氧化皮层间及界面结合强度分别为114和112 MPa,沿宽度方向的分别为155和121 MPa,沿轧制方向喷射强度比沿宽度方降低了20%左右,因此说明除鳞过程中喷浆方向沿轧制方向有利于能耗降低和氧化皮去除。
The oxide scale peeling process and interface bonding strength of hot-rolled 304 stainless steel were studied by conducting scratch tests along the rolling direction and width direction.The acoustic emission signal and friction factor in the process of scratch were collected,combined with the microscopic morphologies of the oxide scale in the process of fracture,the bonding forces between inner and outer oxide scales and between oxide scale and substrate were determined.The difference of ineterlayer and interface bonding strength along different directions was analyzed,and the interface bonding strength of oxide scale was calculated theoretically.The results show that the oxide scale is two-layer structure,and it causes two saltation of acoustic emission signal during the scratch test,and the friction factor is divided into three stages.Under the influence of the residual stress,the critical load along the width direction is larger than that along the rolling direction.The results also show that the ineterlayer and interface bonding strength of oxide scale along the rolling direction is 114 and 112 MPa,and 155 and 121 MPa along the width direction,respectively.The spout strength along the rolling direction is 20%lower than that along the width direction.Therefore,in the process of descaling,the spout direction along the rolling direction is conducive to the reduction of energy consumption and the removal of oxide scale.
作者
郭瑞
周存龙
段晶晶
樊铭洋
龚建雄
GUO Rui;ZHOU Cun-long;DUAN Jing-jing;FAN Ming-yang;GONG Jian-xiong(Shanxi Provincial Key Laboratory of Metallurgical Equipment Design Theory and Technology,Taiyuan University of Science and Technology,Taiyuan 030024,China;School of Vehicle&Transportation Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2023年第3期183-189,共7页
Journal of Plasticity Engineering
基金
中央引导地方科技发展资金资助项目(Z135050009017)
山西省重点研发计划(201903D421046)
山西省科技重大专项(20181102015)
山西省高等学校科技创新计划(2022L308)。
关键词
划痕试验
结合强度
热轧不锈钢
氧化皮
scratch test
bonding strength
hot-rolled stainless steel
oxide scale
