【摘 要】
：
为研究30CrMoA HL级抽油杆断裂失效原因,通过理化性能试验、金相组织分析等手段,对30CrMoA HL级抽油杆进行失效分析。结果显示,断口位于抽油杆端部镦锻过渡区圆弧消失前沿30
【机 构】
：
长庆油田分公司采油二厂工艺研究所,西安石油大学材料科学与工程学院
【基金项目】
：
国家自然科学基金青年科学基金项目“W/B4C纳米多层涂层的界面结构和强韧化机理研究”(项目编号51902254),陕西省自然科学基础研究计划“Al掺杂FeMn/TiN纳米涂层的相变行为和强韧化机理研究”(项目编号2018JQ5108)。
论文部分内容阅读
为研究30CrMoA HL级抽油杆断裂失效原因,通过理化性能试验、金相组织分析等手段,对30CrMoA HL级抽油杆进行失效分析。结果显示,断口位于抽油杆端部镦锻过渡区圆弧消失前沿30 mm左右,抽油杆表面发生严重局部腐蚀,所有裂纹均起源于表面腐蚀坑底部;通过有限元模拟其服役过程,发现其断裂应力高达904 MPa,接近抽油杆的屈服强度。结果表明,腐蚀疲劳是导致抽油杆断裂的主要原因,该区域易发生截面突变从而导致应力集中。抽油杆的结构特点、高应力交变载荷以及腐蚀介质等因素共同作用导致抽油杆发生腐蚀疲劳断裂。
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