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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Effect of carbon content on etching response for identification of plastic deformation zones in carbon steels
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Effect of carbon content on etching response for identification of plastic deformation zones in carbon steels

机译：碳含量对刻蚀响应的影响，以识别碳钢中的塑性变形区

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A recently developed etching technique to detect localized plastic deformation on a macro scale in 0.10-0.55%- carbon steels has been studied. Etching was carried out on samples plastically deformed and then heated to 550 ℃ for a certain period of time. The plastic deformation zone was clearly seen in the low carbon steel (～0.15%C), whereas it was mainly opaque in the medium carbon steel (0.25-0.35%C) and could not be seen in the high carbon steel (0.55%C). In the case of low carbon steels, severe chemical reaction occurred in the undeformed ferrite grains, while there was a weak reaction in the deformed ferrite. The plastic zone was detectable from the different surface states. Such a change in etching response in the above carbon steels was found to be related to their microstructural morphology (ferrite/pearlite), and a large amount of ferrite grain in the sample, i.e. the low carbon steels, was more suitable for revealing the plastic zone. This was due to the change in microstructure: (i) many tiny cementite particles (Fe_3C) are precipitated in the deformed ferrite matrix during heating process, and (ii) finer ferrite grains are produced in the plastic zone. Because the main reason for observation of the plastic zone is related to the change in microstructure in the ferrite matrix, the material having a large amount of pearlite (high carbon steel) did not show the plastic deformation zone. Based upon the change of microstructure in ferrite, details of the etching mechanism for identification of the plastic zone are discussed.
机译：研究了一种最新开发的蚀刻技术，该技术可以在0.10-0.55％的碳素钢中宏观检测局部塑性变形。对发生塑性变形的样品进行蚀刻，然后加热到550℃一定时间。在低碳钢（〜0.15％C）中可以清楚地看到塑性变形区，而在中碳钢（0.25-0.35％C）中主要是不透明的，而在高碳钢（0.55％C）中则看不到）。在低碳钢中，未变形的铁素体晶粒发生了严重的化学反应，而变形的铁素体则发生了微弱的反应。从不同的表面状态可以检测到塑料区。发现上述碳钢中蚀刻反应的这种变化与其显微组织形态（铁素体/珠光体）有关，并且样品中的大量铁素体晶粒（即低碳钢）更适合于揭示塑料。区。这是由于微观结构的变化：（i）在加热过程中，许多细小的渗碳体颗粒（Fe_3C）沉淀在变形的铁素体基体中；（ii）在塑性区产生了更细的铁素体晶粒。因为观察塑性区的主要原因与铁素体基体中的显微组织的变化有关，所以具有大量珠光体的材料（高碳钢）没有显示塑性变形区。基于铁素体组织的变化，讨论了用于识别塑性区的腐蚀机理的细节。

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