无缝钢管的组织变化对其淬透性的影响研究  

Study on Influence by Microstructure Change of Seamless Steel Pipe on Its Hardenability

作　　者：李东远 吴光辉 周正平[2] 周勇[2] 宋述鹏[1] 吴润[1] LI Dongyuan;WU Guanghui;ZHOU Zhengping;ZHOU Yong;SONG Shupeng;WU Run(Wuhan University of Science and Technology,Wuhan 430081,China;Hengyang Valin Steel Tube Co.,Ltd.,Hengyang 421001,China)

机构地区：[1]武汉科技大学,湖北武汉430081 [2]衡阳华菱钢管有限公司,湖南衡阳421001

出　　处：《钢管》2023年第4期16-20,共5页Steel Pipe

摘　　要：采用Gleeble 3500热模拟机测定高强韧性钢种HG05调质态无缝钢管的静态CCT曲线,制定钢的临界淬火冷却速度,并取样分析HG05热成形无缝钢管的外中内层均为贝氏体和铁素体组织,铁素体组织变化较大,中间层铁素体尺寸最大,平均约为10μm;内层铁素体体积分数最多,约为12.4%。以调质态钢临界淬火冷却速度对热成形钢管外中内层进行热模拟淬火,得到未完全淬透组织。调质组织均匀,加热奥氏体形核核心少,热模拟加热后奥氏体晶粒大,临界淬火冷却速度为20℃/s,而热成形组织的临界淬火冷却速度要大。The static CCT curve of the HG05 as-quenched-tempered seamless steel tube with high strength and toughness is measured by the Gleeble 3500 thermal simulation machine,and then the critical quenching-cooling rate of the steel is determined.The outer layer,the middle layer and the inner layer of the hot-formed HG05 seamless steel pipe are sampled and analyzed.All the said layers are of the bainite and ferrite structures,and the ferrite structure changes greatly.The size of ferrite in the middle layer is the largest,and the average size is 10μm;and the inner ferrite volume fraction is the highest as about 12.4 vt%.The outer,the middle and the inner layers of the hot-formed steel tube are quenched with the thermal simulation method,and the critical quenching-cooling rate of the as-quenched-tempered steel,and the incompletely quenched microstructure is obtained.Since the quenched-tempered microstructure is homogeneous,there is little austenitic nucleation core,and after being heated with the thermal simulation,the austenite grain size is large,the critical quenching-cooling rate of austenite is 20℃/s,whereas the critical quenching-cooling rate of the hotformed microstructure is higher than that of the austenite.

关 键 词：无缝钢管 金相组织 淬透性 临界淬火冷却速度 热成形组织 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TE9[金属学及工艺—金属材料]