【作者】 何文武； 秦凤明； 李飞； 田继红； 陈慧琴；

【Author】 HE Wenwu;QIN Fengming;LI Fei;TIAN Jihong;CHEN Huiqin;School of Materials Science and Engineering,Taiyuan University of Science and Technology;

【机构】 太原科技大学材料科学与工程学院；

【摘要】 Mn18Cr18N高氮奥氏体不锈钢是制造大型发电机护环的首选材料。本文首先阐明了基于该钢电渣重熔凝固组织在热变形过程中位错控制的动态再结晶和孪晶控制的动态再结晶;然后分析了其在冷却或等温过程中的析出相类型和形貌,以及其对该钢力学性能的影响。并在分析护环热成形技术的基础上,提出多道次和中间保温的热辗扩成形微观组织细匀化方法。最后阐述了护环超高压泵液压胀形技术的关键技术。更多还原

【Abstract】 Mn18Cr18N high-nitrogen austenitic stainless steel is the first choice for manufacturing heavy generator retaining rings.In this paper,the dislocation controlled dynamic recrystallization and the twinning controlled recrystallization during hot deformation of the as-cast structure in ESR steel was elaborated at first.The precipitation and its morphology of the steel during cooling or holding after forging,and its effects on mechanical properties were analyzed.Then combined with the hot forming technology of retaining rings,the multi-pass hot ring rolling process with holding during inter-passes was foreword and stated.At last,the key technology of the cold expanding method with an ultra-high pressure pump was stated and analyzed.更多还原