Eddy Current Detection of the Martensitic Transformation in AISI304 Induced upon Cryogenic Cutting,Steel Research International

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Eddy Current Detection of the Martensitic Transformation in AISI304 Induced upon Cryogenic Cutting
Steel Research International ( IF 1.9 ) Pub Date : 2020-10-14 , DOI: 10.1002/srin.202000299
Lara V. Fricke ₁ , Hai Nam Nguyen ₂ , Bernd Breidenstein ₂ , David Zaremba ₁ , Hans Jürgen Maier ₁

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The combination of a hard subsurface layer and a ductile component core is advantageous for many applications. Steels are often heat treated to create such a hardened subsurface, which is both time‐ and energy‐consuming. It is of great advantage to create a hardened subsurface directly within the machining process, as the production line of most components includes such a process to produce the desired geometric dimensions and surface quality. To achieve a martensitic subsurface layer within the machining process, cryogenic, external turning using a metastable AISI304 austenitic steel is used herein. Herein eddy current testing and the analysis of higher harmonics are used for the detection of the ferromagnetic, martensitic phase in the parent austenite. A good correlation is found between the martensite content and the amplitude of the signals measured. Therefore, eddy current testing is considered as a suitable real‐time, nondestructive testing method, which forms the basis for the generation of a tailored, deformation‐induced martensitic subsurface layer during external turning.

中文翻译：

低温切削引起的AISI304中马氏体转变的涡流检测

硬地下层和可延展部件芯的组合对于许多应用是有利的。经常对钢进行热处理以形成这样的硬化表面，这既费时又耗能。直接在机加工过程中创建硬化的子表面是非常有利的，因为大多数组件的生产线都包括这样一种过程，以产生所需的几何尺寸和表面质量。为了在机加工过程中获得马氏体次表面层，本文中使用亚稳AISI304奥氏体钢进行低温外部车削。此处，涡流测试和高次谐波分析用于检测母奥氏体中的铁磁，马氏体相。在马氏体含量与测量信号的振幅之间发现良好的相关性。因此，涡流探伤被认为是一种合适的实时无损探伤方法，为在外部车削过程中生成量身定制的，变形引起的马氏体地下层奠定了基础。

更新日期：2020-10-14

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