回火和冲击试验温度对套管钻井钢冲击韧性及断裂机理的影响  

Effect of Tempering and Impact Test Temperature on Impact Toughness and Fracture Mechanism of Casing Drilling Steel

作　　者：许天旱[1,2] 张燚 毕柳涵 XU Tianhan;ZHANG Yi;BI Liuhan(School of New Energy,Xi'an Shiyou University,Xi'an 710065,China;School of Materials Science and Engineering,Xi'an Shiyou University,Xi'an 710065,China)

机构地区：[1]西安石油大学新能源学院,西安710065 [2]西安石油大学材料科学与工程学院,西安710065

出　　处：《机械工程材料》2023年第4期40-44,60,共6页Materials For Mechanical Engineering

基　　金：石油管材国家重点实验室资助项目(223117007);中国石油天然气集团公司科学研究与技术开发项目(2016-A3905);西安石油大学材料科学与工程学院省级优势学科项目(YS32030203);研究生创新与实践能力培养项目(YCS21121022)。

摘　　要：对以铁素体+珠光体组织为主的钢材进行910℃淬火+不同温度回火(500,550,600℃)热处理,获得超高强度级套管钻井钢,并在不同温度(-60~20℃)下进行冲击试验,研究了回火和冲击试验温度对套管钻井钢冲击韧性和断裂机理的影响。结果表明:随着回火温度的升高,套管钻井钢的马氏体逐渐消失,形成回火索氏体组织,室温冲击时消耗的冲击能增大,最大冲击载荷减小;不同温度回火钢的冲击断口宏观形貌均为纤维区和剪切唇,断裂机理均为韧性断裂;550℃回火套管钻井钢的韧脆转变温度为-33.64℃,随着冲击试验温度的降低,其冲击能逐渐减小,宏观断口形貌由完全纤维区转变为近完全放射区,微观断口形貌由完全韧窝形貌转变为包含局部韧窝结构的准解理结构。The steel with a ferrite+pearlite microstructure was quenched at 910 C+tempered at different temperatures(500,550,600℃)to obtain the ultra-high strength grade casing drlling steel.The obtainal casing drilling steel was subjected to impact tests at different temperatures(-60-20℃).The effects of tempering and impact test temperatures on the impact toughness and fracture mechanism of the casing drlling steel were studied.The results show that as the tempering temperature increased,and the martensite in the casing drlling steel gradually disappeared,and the tempered sorbite structure was formed.Meanwhile,the impact energy consumed in room temperature impact increased,and the maximum impact load decreased.The impact fracture macromorphology of the steel tempered at different temperatures was both fiber zone and shear lip,and the fracture mechanism was ductile fracture.The ductile-brttle transition temperature of the casing drilling steel tempered at 550℃was-33.64℃.As the impact test temperature decreased,the impact energy gradually decreased,the fracture macromorphology changed from a complete fiber region to a nearly complete radiation region,and the fracture micromorphology changed from complete dimple to a quasi-cleavage structure containing local dimple structures.

关 键 词：套管钻井钢 回火 试验温度 冲击韧性 断裂机理 

分 类 号：TG142.12[一般工业技术—材料科学与工程]