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首页> 外文期刊>Revista de metalurgia >Influencia de la transformación austenita-martensita en la estabilidad dimensional de un nuevo acero para herramientas aleado con niobio (0,08%) y vanadio (0,12%)
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Influencia de la transformación austenita-martensita en la estabilidad dimensional de un nuevo acero para herramientas aleado con niobio (0,08%) y vanadio (0,12%)

机译：奥氏体-马氏体相变对铌（0.08％）和钒（0.12％）合金化的新型工具钢尺寸稳定性的影响

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摘要

Austenite-martensite transformation influence on the dimensional stability of a new experimental tool steel alloyed with niobium (0.08% wt.) and vanadium (0.12% wt.) has been studied. The dimensional stability of this new steel was compared with the dimensional stability of commercial steel, after and before two thermal treatments, T1 (860 °C) and T2 (900 °C). The thermal treatments consisted on heating and cooling, at 1 atmosphere of pressure, in N 2 atmosphere furnace, fol lowing by heating in a conventional furnace at 180 °C during 1 hour. Initially, the experimental steel composition and Ac 1 and Ac 3 transformation temperatures were determined by glow-discharge luminescence (GDL) and dilatometric tests, respectively, in order to select the austenization temperatures of T1 and T2 treatments. After hardness measurement, the microstructure of both steels was characterized by X-Ray Diffraction (XRD) and optical metallography, before and after of T1 and T2 thermal treatments. Finally, longitudinal and angular dimensional stability analyses were realized for both commercial and experimental steels. After a contrastive hypothesis analysis, the results showed that the longitudinal relative variation of the experimental steel calculated was around 0.2% and the angular relative variation was not significant.
机译：研究了奥氏体-马氏体相变对新型实验工具钢与铌（0.08％重量）和钒（0.12％重量）合金化的尺寸稳定性的影响。在T1（860°C）和T2（900°C）两种热处理前后，将这种新钢的尺寸稳定性与商品钢的尺寸稳定性进行了比较。热处理包括在N 2气氛炉中在1个大气压下加热和冷却，随后在常规炉中在180℃下加热1小时。最初，分别通过辉光放电发光（GDL）和膨胀测量确定实验钢的成分以及Ac 1和Ac 3的转变温度，以选择T1和T2处理的奥氏体化温度。在测量硬度之后，在T1和T2热处理之前和之后，通过X射线衍射（XRD）和光学金相学对两种钢的显微组织进行表征。最后，对商用和实验钢都实现了纵向和角向尺寸稳定性分析。经过对比假设分析后，结果表明，计算出的实验钢的纵向相对变化约为0.2％，角度相对变化不明显。

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