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本文对与能源科学密切相关的无磁奥氏体高强度结构钢50Mn18Cr4高温形变热处理的理论问题进行了研究。这种钢常常因其粗大或不均匀的晶粒尺寸而在最终的形变强化工序中报废。作者试图解决发电机护环生产实践中大批产品的这一类不合格问题。研究内容不是具体的工艺参数,而是研究该钢的组织变化和高温再结晶的规律。由此提出新的护环生产工艺设想。它由如下三步组成:(1)电渣熔铸环坯→(2)高温控制热变形和控制冷却(即高温形变热处)→(3)冷变形强化。本文内容仅为第二步的理论基础,但考虑了与第一步之间的衔接。
In this paper, the theoretical problems of high temperature deformation heat treatment of 50Mn18Cr4 non-magnetic austenitic high-strength structural steel closely related to energy science are studied. This steel is often scrapped in the final deformation strengthening process due to its coarse or non-uniform grain size. The author attempts to address this type of nonconforming issue with a large number of products in the generator retaining ring production practice. The content of the study is not a specific process parameters, but to study the microstructure and high temperature recrystallization of the law. The proposed new guard ring production process ideas. It consists of the following three steps: (1) electroslag casting billet → (2) high temperature control of thermal deformation and controlled cooling (ie high temperature deformation heat treatment) → (3) cold deformation strengthening. This article is only theoretical basis for the second step, but consider the link with the first step.