摘要
通过低碳微合金化结合热机械控制工艺制备高强韧钢材,是管线钢生产的主流工艺技术,然而在实际应用中当热处理温度控制不当时,管材的力学拉伸性能就会发生变化。本研究以TMCP工艺制备的X80管线钢开展热处理试验研究,分析热处理温度对TMCP工艺管线钢力学拉伸性能的影响,发现X80管线钢的拉伸曲线具有连续屈服特征,没有明显的屈服平台;热处理后管材应力应变曲线发生变化,屈服平台出现,当热处理温度为260℃时管材的屈服平台存在明显尖峰,力学拉伸强度明显得到提高。该X80管线钢组织为多相组织,其真应力真应变关系不完全符合Hollomon公式,整体分为两个阶段加工硬化。第二阶段双对数曲线近似为一条直线,管材具有确定的形变硬化指数,当热处理温度为560℃时管材的形变硬化指数出现峰值。
The preparation of high strength and toughness steel by low carbon microalloying combined with thermal-mechanical control process is the mainstream technology in pipeline steel production.However,when the heat treatment temperature is not properly controlled in practical application,the mechanical tensile properties of pipes will change.The heat treatment test of X80 pipeline steel prepared by TMCP process was studied to analyze the effect of heat treatment temperature on the mechanical tensile properties of pipeline steel.It was found that the tensile specimen of X80 pipeline steel had the feature of continuous yield and without obvious yield platform.After heat treatment,the stress and strain of the pipe changed,and the yield platform appeared.When the heat treatment temperature was 260℃,the yield platform of the pipe had an obvious peak,and the mechanical tensile strength was obviously improved.The structure of X80 pipeline steel was multiphase,and its true stress and strain relationship did not completely conform to Hollomon formula.At the second stage,the double logarithmic curve was approximately a straight line.When the heat treatment temperature was 560℃,the deformation hardening index of the pipe appeared the maximum value.
作者
许彦
刘迎来
丰振军
聂向晖
李亮
张华佳
张磊
XU Yan;LIU Ying-lai;FENG Zhen-jun;NIE Xiang-hui;LI Liang;ZHNAG Hua-jia;ZHANG Lei(Tubular Goods Research Center of CNPC,Xi'an Shanxi 710077,China;Beijing Longshine Oil Tubular Technology Co.,Ltd.,Beijing 100101,China)
出处
《热处理技术与装备》
2020年第6期37-41,共5页
Heat Treatment Technology and Equipment
基金
国家重点研发计划(项目编号:2018YFF0215003-1)。
关键词
热处理温度
TMCP工艺
管线钢
力学拉伸性能
heat treatment temperature
TMCP process
pipeline steel
mechanical tensile property
