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首页> 外文会议>PVP2011;ASME Pressure Vessels and Piping conference >STUDY ON THE MICROSTRUCTURE OF 20 STEEL WITH STRAIN AGING
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STUDY ON THE MICROSTRUCTURE OF 20 STEEL WITH STRAIN AGING

机译：时效对20号钢组织的影响

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摘要

20 steel thick-wall high-pressure pipes are widely used in chemical industry in China, but brittle fracture accidents of them happen frequently in recent years. The strain aging steel pipes in this research were artificially made in the laboratory and naturally occurred in fabrication or service. The microstructure of strain aging in samples taken from the unused pipes and the accident pipes caused directly or mainly by strain aging were observed with optical microscopy, scanning electron microscopy, and transmission electron microscopy. The results show that: (l)uniform ferrite and pearlite with uniform lamellar structure can be achieved with normalizing; lamellar pearlite fractures and distorts while a large number of dislocation cells, micro-holes or cracks appear in material after strain aging; and broken distorted pearlite changes to uniform spherical structure after stress relieving; (2) both the samples taken from unused and accident pipes which strain aging artificially in the laboratory and naturally in fabrication or service have the same characteristics as following: the basic changes of microstructure after strain aging cannot be observed with optical microscopy, but can be observed with scanning electron microscopy and transmission electron microscopy.
机译：20层钢厚壁高压管在中国化学工业中得到广泛应用，但近年来脆性断裂事故屡有发生。本研究中的应变时效钢管是在实验室中人工制造的，并且自然地出现在制造或服务中。用光学显微镜，扫描电子显微镜和透射电子显微镜观察从未使用的管和事故管直接或主要由应变时效引起的样品中应变时效的微观结构。结果表明：（1）通过正火可以获得均匀的层状结构的均匀铁素体和珠光体;层状珠光体断裂变形，应变时效后在材料中出现大量的位错单元，微孔或裂纹。应力消除后，断裂变形的珠光体转变为均匀的球形结构。 （2）从未使用的和意外的管道中取样的样品，在实验室以及自然地在制造或服务过程中进行人工时效老化，都具有以下特征：应变时效后显微组织的基本变化无法通过光学显微镜观察到，但可以用扫描电子显微镜和透射电子显微镜观察。

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