冷轧薄板激光切割热影响区的深度及性能  

Depth and performance of laser cutting heat affected zone of cold rolled sheet

作　　者：王毅磊 历妍 薛凯 WANG Yilei;LI Yan;XUE Kai(Products&Technique Management Department,Baosteel Zhanjiang Iron and Steel Co.,Ltd.,Zhanjiang 524072,China)

机构地区：[1]宝钢湛江钢铁有限公司制造管理部,湛江524072

出　　处：《理化检验（物理分册）》2024年第8期31-35,共5页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：为确定激光切割热影响区深度和激光切割热影响区对不同厚度、不同强度冷轧薄板产品力学性能的影响,通过改变激光切割速率的方法,对冷轧薄板产品进行激光切割试验,并对激光切割后热影响区的组织、深度和板材的拉伸性能进行研究。结果表明:热影响区可分为两部分,第一部分为激光切缝边缘的熔化区,第二部分为非熔化区,熔化区主要为马氏体,非熔化区主要为马氏体+贝氏体,激光切割速率越快,冷轧薄板的热影响区深度越小,冷轧薄板的强度越高或厚度越厚,热影响区深度越大;激光切割加工试样比加工中心加工试样的屈服强度和抗拉强度高,断后伸长率低,且随着钢种等级的提高,两者间的差异不断增大。In order to determine the depth of laser cutting heat affected zone and the influence of laser cutting heat affected zone on the mechanical properties of cold rolled sheet products with different thickness and strength,the laser cutting test of cold rolled sheet products was carried out by changing the laser cutting rate,and the microstructure,depth and tensile properties of the heat affected zone after laser cutting were studied.The results show that the heat affected zone could be divided into two parts.The first part was the melting zone at the edge of the laser kerf,and the second part was the non-melting zone.The melting zone was mainly martensite,and the non-melting zone was mainly martensite+bainite.The faster the laser cutting rate,the smaller the depth of the heat affected zone of the cold rolled sheet,the higher the strength of the cold rolled sheet or the thicker the thickness,and the greater the depth of the heat affected zone.The yield strength and tensile strength of laser cutting samples were higher than those of machining center samples,and the elongation after fracture was lower.With the increase of steel grade,the difference between the two was increasing.

关 键 词：冷轧薄板 激光切割 热影响区 力学性能 显微组织 钢种等级 

分 类 号：TB31[一般工业技术—材料科学与工程] TG115.2[金属学及工艺—物理冶金]