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首页> 美国卫生研究院文献>Materials >Microstructure Evolution and Orientation Relationship of Reverted Austenite in 13Cr Supermartensitic Stainless Steel During the Tempering Process
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Microstructure Evolution and Orientation Relationship of Reverted Austenite in 13Cr Supermartensitic Stainless Steel During the Tempering Process

机译：13Cr超马氏体不锈钢回火过程中奥氏体组织演变及取向关系

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摘要

The transformation mechanism of reverted austenite and the amount of reverted austenite during the tempering process in supermartensitic stainless steel have been investigated by X-ray diffraction (XRD), electron backscattered diffraction (EBSD), and a high-temperature laser scanning confocal microscope (HTLSCM). The results indicate that the microstructure mainly consists of tempered martensite and reverted austenite. The reverted austenite nucleates uniformly at the sub-block boundary and prior grain austenite boundary. The amount of reverted austenite strongly relies on the tempering time, showing a positive correlation in the supermartensitic stainless steel. The crystallographic orientation relationship between reverted austenite and martensite meets the Kurdjumov-Sachs(K-S) relationship and the deviation angle is mainly concentrated at about 2 degrees. The mechanism of reverted austenite transformed from martensite is a diffusion mechanism. The growth kinetics of the reverted austenite are dominated by diffusion of the Ni element and there is no shear deformation of the martensite matrix in the in situ observation. It can be deduced that the reverted austenite is formed by nickel diffusion during tempering at 620 °C for different tempering times.
机译：通过X射线衍射（XRD），电子背散射衍射（EBSD）和高温激光扫描共聚焦显微镜（HTLSCM）研究了超马氏体不锈钢回火过程中回奥氏体的转变机理和回火奥氏体含量。 ）。结果表明，显微组织主要由回火马氏体和还原奥氏体组成。还原的奥氏体在子块边界和先前的晶粒奥氏体边界均匀成核。还原奥氏体的量强烈依赖于回火时间，在超马氏体不锈钢中显示出正相关。还原奥氏体与马氏体之间的晶体取向关系满足Kurdjumov-Sachs（K-S）关系，偏角主要集中在2度左右。马氏体转变为奥氏体的机制是扩散机制。还原奥氏体的生长动力学主要受Ni元素的扩散影响，在原位观察中没有马氏体基体的剪切变形。可以推断出，奥氏体是由镍在620℃回火期间不同回火时间扩散而形成的。

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