采用光学显微镜、扫描电镜、拉伸试验机、疲劳试验机等研究了套管钻井用钢N80和K55的显微组织和力学性能,并进行了对比.结果表明:N80钢显微组织主要由回火索氏体、铁素体及少量上贝氏体构成,K55钢显微组织主要由珠光体和网状铁素体构成;N80钢的抗拉强度与K55钢差别不大,但屈服强度比K55钢高约40%,而且N80钢的拉伸断口韧窝更细小,更均匀,但伸长率低于K55钢的;应力比对N80钢裂纹扩展速率的影响显著小于对K55钢的影响,N80钢的K_(IC)比K55钢的更大;因此,N80钢具有更好的综合力学性能.
By means of optical microscopy, SEM, tensile testing machine and fatigue testing machine, the microstructure and mechanical properties of NS0 and K55 steels for casing drilling were studied and compared. The results show that the microstructure of N80 steel consisted of tempered sorbite, ferrite and a small amount of upper bainite, the microstructure of K55 steel mainly consisted of pearlite and netlike ferrite. There was little difference in tensile strength between the N80 and K55 steels, but the yield strength of N80 steel was 40% higher than that of K55 steel. The tensile fracture dimple of NS0 steel was finer and more homogeneous than that of K55 steel, but the elongation of N80 steel was lower than that of K55 steel. The effect of the stress ratio on fatigue crack growth rate of NS0 steel was much less than on that of K55 steel, and K_(IC) of NS0 steel was higher than that of K55 steel. So the comprehensive mechanical properties of N80 steel was better than those of K55 steel.
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