This study simulated the Laves phase precipitation embrittlement of super-ferritic stainless steels (SFSSs). The dissolution kinetics of the Laves phase, grain coarsening, and their effects on the mechanical properties and ductile-brittle transition during dissolution heat treatment were subsequently studied. The Laves phase dissolution adhered to the Johnson-Mehl-Avram-Kolmogorov variation expression, exhibiting an activation energy of approximately 368 kJ mol. High-temperature reheating (1100 °C) resulted in severe grain coarsening, leading to brittle fracture. A dissolution treatment of only 0.5 h at 1050 °C resulted in a high yield strength of 407.8 MPa, large elongation of 29.6%, and impact toughness of 237.2 J/cm because the entirety of the Laves phase was dissolved and no obvious grain growth was observed. This indicates that dissolution heat treatment is a simple and feasible method for recovering the ductility and toughness of Laves phase precipitation-embrittled SFSSs.

中文翻译：

---

超级铁素体不锈钢中Laves相沉淀脆化及其溶解动力学对韧脆转变的影响

本研究模拟了超级铁素体不锈钢 (SFSS) 的 Laves 相沉淀脆化。随后研究了Laves相的溶解动力学、晶粒粗化及其对溶解热处理过程中力学性能和韧脆转变的影响。Laves 相溶解遵循 Johnson-Mehl-Avram-Kolmogorov 变体表达式，表现出约 368 kJ mol 的活化能。高温再加热（1100℃）导致晶粒严重粗化，导致脆性断裂。在1050℃下仅进行0.5小时的溶解处理即可获得407.8MPa的高屈服强度、29.6%的大伸长率和237.2J/cm的冲击韧性，因为Laves相全部溶解并且没有明显的晶粒长大。观察到的。这表明溶解热处理是恢复Laves相沉淀脆化SFSS塑性和韧性的一种简单可行的方法。