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首页> 外文期刊>NDT & E international >The characterisation of work-hardened austenitic stainless steel by NDT micro-magnetic techniques
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The characterisation of work-hardened austenitic stainless steel by NDT micro-magnetic techniques

机译：NDT微磁技术表征加工硬化的奥氏体不锈钢

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摘要

It is accepted that the work-hardening of austenitic stainless steels during machining or cold-working results in two main products: the appearance of alpha'-martensite and increased dislocation densities within the host material. In machining, this results in many difficulties (poor surface finish, poor machinability and high tool wear). Non-destructive sensing is essential in today's high volume production environments because of its ease of use, speed and non-invasive sensing. Non-destructive magnetic measurement techniques have been employed to characterise the work-hardening of an austenitic stainless steel grade (SS404) due to room-temperature plastic tensile loading. These techniques include the use of magnetic Barkhausen noise, ferromagnetic phase measurement and coercivity measurement. It was found that the dislocation density, rather than the alpha'-martensite phase, to be the cause of material work-hardening. It is suggested that the use of coercivity measurement is a useful quantitative and non-destructive method for characterising work-hardening of the studied alloy in relation to the amount of its plastic deformation (work-hardening).
机译：公认的是，在机加工或冷加工过程中奥氏体不锈钢的加工硬化产生两种主要产品：α'-马氏体的出现和基质材料中位错密度的增加。在机加工中，这会带来许多困难（表面光洁度差，可加工性差和工具磨损大）。无损感测由于其易用性，速度和无创感测，在当今的大批量生产环境中必不可少。由于室温塑性拉伸载荷，已采用​​无损磁测量技术来表征奥氏体不锈钢牌号（SS404）的加工硬化。这些技术包括使用巴克豪森磁噪声，铁磁相位测量和矫顽力测量。已经发现，位错密度而不是α'马氏体相是引起材料加工硬化的原因。建议使用矫顽力测量是一种有用的定量无损方法，用于表征所研究合金的塑性变形量（加工硬化）。

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