不同热处理工艺下L245M钢级小弯曲半径感应加热弯管性能的研究  

Study on Properties of L245M Small Bending Radius Induction Heating Elbow under Different Heat Treatment Processes

作　　者：许彦 刘迎来[1,2] 聂向晖 丰振军[1,2] 李亮 李记科[1,2] XU Yan;LIU Yinglai;NIE Xianghui;FENG Zhenjun;LI Liang;LI Jike(CNPC Tubular Goods Research Institute,Xi'an 710077,China;Beijing Longshine Oil Tubular Technology Co.,Ltd.,Beijing 100101,China)

机构地区：[1]中国石油集团石油管工程技术研究院,陕西西安710077 [2]北京隆盛泰科石油管科技有限公司,北京100101

出　　处：《热加工工艺》2022年第5期101-104,109,共5页Hot Working Technology

摘　　要：对不同热处理工艺下的L245M钢级小弯曲半径感应加热弯管壁厚分布、力学性能、金相组织进行了检验分析。发现在感应加热弯制后弯曲段管体壁厚发生了明显变化,外弧侧壁厚减薄,内弧侧壁厚增厚。回火处理后,管体壁厚出现回弹;与母管相比,感应加热弯制后弯曲段内弧侧管体强度略有升高,而外弧侧管体强度明显升高,强度增加了近200MPa,断后伸长率、断面收缩率以及冲击韧性出现明显下降;回火处理后弯管管体强度略有下降,整件弯管各部位拉伸性能分布更均匀,冲击性能得到明显改善;感应加热弯制后弯管无论是否回火,弯曲段位置内弧侧的管体力学性能最接近直管段,其次是中性区,外弧侧波动最大。The analysis of wall thickness distribution,mechanical properties and metallographic microstructure of L245M steel grade small bending radius induced heating pipe under different heat treatment processes was carried out.It is found that the wall thickness of the tube in the bending section changes obviously after induction heating bending,and the wall thickness of the outer arc side decreases and the wall thickness of the inner arc side thickens.After tempering,the wall thickness of tube body produces springback.Compared with those of the mother tube,the strength of the inner arc side tube increases slightly after induction heating bending,while the strength of the outer arc side tube increases significantly,and the strength increases nearly 200 MPa,the elongation after break,section shrinkage and impact performance decrease obviously.After tempering,the strength of the pipe body decreases slightly,the tensile properties are more uniform and the impact properties are improved obviously.After induction heating bending,the mechanical properties of the tube body on the inner arc side of the bending section are the closest to the straight pipe section,followed by the neutral zone,and the outer arc side fluctuates the most.

关 键 词：小弯曲半径 L245M钢级 感应加热弯制 回火 

分 类 号：TG316.14[金属学及工艺—金属压力加工]