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A new experimental method for identifying the conditions necessary for diffusion bonding in free cutting steels

机译:确定快速切削钢中扩散结合必要条件的新实验方法

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摘要

Porosity in cast bloom steel may lead to reduced strength or inconsistency of final rolled bar products and components if not properly closed and healed during the hot rolling process. Partial or complete recovery of strength in such porous materials can be achieved by diffusive healing processes at elevated temperatures. Devising an appropriate healing process that does not cause discontinuity in the microstructure, and in the mechanical properties at the bonding sites, whilst preventing distortion of the component during bonding requires an accurate choice of thermo-mechanical processing parameters. Despite work carried out on optimising diffusion bonding in materials such as titanium alloys, aluminium alloys and copper, the diffusion bonding process in free cutting steels has received relatively little attention. To support thermomechanical process optimisation (e.g. rolling) and calibration of theoretical models, a new experimental method was developed to determine combinations of load, temperature and time sufficient for complete diffusion bonding in as-cast Free Cutting Steels (FCS). The extent of diffusive healing and bond strength were examined by tensile testing to failure corroborated by SEM examination of the bond line. This enabled optimal loading conditions for the formation of a complete, strong bond to be identified.
机译:如果在热轧过程中未正确封闭和愈合,铸坯大孔钢中的气孔可能会导致强度降低或最终轧制钢筋产品和组件的不一致。这种多孔材料的强度的部分或全部恢复可以通过在高温下的扩散愈合过程来实现。设计一种适当的愈合过程,该过程不会在粘结部位引起微观结构和机械性能的不连续,同时在粘结过程中防止部件变形,需要精确选择热机械加工参数。尽管在优化诸如钛合金,铝合金和铜之类的材料中的扩散结合方面进行了工作,但是在易切削钢中的扩散结合过程却很少受到关注。为了支持热机械过程的优化(例如轧制)和理论模型的校准,开发了一种新的实验方法来确定足以在铸态自由切削钢(FCS)中完成扩散粘结的载荷,温度和时间的组合。扩散愈合的程度和粘结强度通过拉伸试验检查,直至通过SEM对粘结线的检查得到证实。这样就可以确定用于形成完整,牢固结合的最佳负载条件。

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