Abstract

A heat treatment methodology is described for obtaining ultra-high strength (> 1700 MPa) and increased − 40 °C toughness (> 45 J/cm²) in a steel. Thermodynamic approach to design heat treatments is demonstrated and utilized to produce refinement of the prior austenite grain size leading to superior properties. The cleavage energy was shown to correlate to both prior austenite grain size, according to an inverse root relationship, as well as the density of high-angle martensite lath boundaries.

中文翻译：

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热处理设计可改变马氏体取向错误并获得优异的强度-韧性组合

摘要

描述了一种热处理方法，可在钢中获得超高强度（> 1700 MPa）和增加− 40°C的韧性（> 45 J / cm ²）。演示了用于设计热处理的热力学方法，并利用该方法对以前的奥氏体晶粒尺寸进行了细化，从而获得了优异的性能。根据根的反比关系，解理能显示出既与先前的奥氏体晶粒尺寸相关，又与高角度马氏体板条边界的密度相关。