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首页> 外文会议>International Conference on Microalloying for New Steel Processes and Applications; 20050907-09; Basque Country(ES) >Processing and Stability of Ultrafine Grained Structures in Some Microalloy Steels
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Processing and Stability of Ultrafine Grained Structures in Some Microalloy Steels

机译：某些微合金钢的超细晶粒组织的加工和稳定性

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摘要

The dynamic strain-induced transformation (DSIT) of ferrite from austenite in intense deformation at temperatures close to A_(r3) were applied to one C-Mn steel and several Nb and Nb-Ti microalloy steels to obtain an ultrafine ferrite grain size. As another route the static recrystallisation of severely cold-rolled martensite (SRM) was utilized. It was found that in the DSIT route a fine prior austenite grain size was crucial to form ferrite with the grain size of 1-3 μm with a considerable fraction of a secondary phase, carbide aggregate/pearlite or martensite. Grain sizes achieved were somewhat finer in steels with a higher microalloying content. In the SRM route, the ferrite grain size of 1-1.5 μm was obtained by using the cold rolling of 80-90% reduction. Thermal stability of the ultrafine-grained structures, especially those from the DSIT route, was found to be excellent. In electron or laser beam welding of 1-2.5 mm sheets neither any coarse-grained zone existed in the heat-affected zone, nor did form any softened zone.
机译：将奥氏体在接近A_（r3）的温度下剧烈变形时，铁素体的动态应变诱导转变（DSIT）应用于一种C-Mn钢和几种Nb和Nb-Ti微合金钢，以获得超细的铁素体晶粒尺寸。作为另一种途径，利用了严重冷轧马氏体（SRM）的静态重结晶。已经发现，在DSIT路线中，精细的先前奥氏体晶粒尺寸对于形成晶粒尺寸为1-3μm且具有相当一部分次级相，碳化物聚集体/珠光体或马氏体的铁素体至关重要。在具有更高的微合金含量的钢中，获得的晶粒尺寸略微更细。在SRM路线中，通过使用80-90％压下率的冷轧获得了1-1.5μm的铁素体晶粒尺寸。发现超细颗粒结构的热稳定性非常好，尤其是来自DSIT路线的那些。在1-2.5毫米薄板的电子或激光束焊接中，在热影响区中既不存在任何粗粒区，也没有形成任何软化区。

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