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首页> 外文期刊>Journal of Materials Science >Microstructural investigations of XW-42 and M2 tool steels in semi-solid zones via direct partial remelting route
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Microstructural investigations of XW-42 and M2 tool steels in semi-solid zones via direct partial remelting route

机译：XW-42和M2工具钢在半固态区通过直接部分重熔路线进行的显微组织研究

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摘要

A suitable microstructure for thixoforming consists of spheroidal grains in a liquid matrix. In order to achieve this, some processing routes have been established. In this study, microstructural evolution of XW-42 and AISI M2 steels via direct partial remelting from the as-annealed condition was examined. Both steels were found to possess certain types of carbides that dissolved when subjected to heating inside the semi-solid zones. The types of carbides were MC-M_6C for AISI M2 steel (fully dissolved between 1280 and 1300 °C) and M_7C_3 for XW-42 steel (fully dissolved between 1250 and 1270 °C). The dissolution of these grain boundary carbides during partial remelting helps with the grain spheroidisation and also with providing grain lubrication for the forming process through solid-liquid particle contact. In addition, solid-solid contacts were also observed (in 2D as well as 3D microstructural observation) and considered useful to provide structural integrity prior to forming. However, these contacts also must also be weak enough to be sheared easily. Compression test results for AISI M2 steel showed that thixotropic behaviour and complete mould filling were observed starting from 35 liquid percent. The same behaviour is also expected to occur for XW-42 steel due to its similarity in microstructural evolution with AISI M2 steel.
机译：触变成形的合适的微观结构由液态基体中的球形晶粒组成。为了实现这一点，已经建立了一些处理路径。在这项研究中，研究了XW-42和AISI M2钢通过从退火状态直接进行部分重熔的组织演变。发现这两种钢都具有某些类型的碳化物，这些碳化物在半固态区内加热时会溶解。对于AISI M2钢，碳化物的类型为MC-M_6C（在1280至1300°C之间完全溶解），对于XW-42钢，碳化物的M_7C_3（在1250至1270°C之间完全溶解）。这些晶粒边界碳化物在部分重熔过程中的溶解有助于晶粒球化，还有助于通过固液颗粒接触为成型过程提供晶粒润滑。另外，还观察到了固-固接触（在2D和3D微观结构观察中），并被认为可用于在成型之前提供结构完整性。但是，这些接触点还必须足够弱以易于剪切。 AISI M2钢的压缩测试结果表明，从35％的液体开始观察到触变行为和完全填充模具。由于XW-42钢在微观组织发展上与AISI M2钢相似，因此也预期会发生相同的行为。

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