This study investigated the feasibility of microalloying strategies for improving the strength of high-carbon wire products subjected to industrial patenting heat treatments for two eutectoid steels: a 0.8C-0.5Mn-0.2Cr-0.08 V alloy (wt.%) and the same composition with an additional 100 ppm Nb. A Gleeble 3500 thermomechanical simulator (Dynamic Systems Inc., Poestenkill, NY, USA) was used to perform heat treatments consisting of a 30 s austenitization at 1093 A degrees C, 950 A degrees C, or 880 A degrees C followed by a 15 s isothermal transformation step at 650 A degrees C, 625 A degrees C, 600 A degrees C, or 575 A degrees C. Vickers hardness, field-emission scanning electron microscopy, and pearlite interlamellar spacing measurements were conducted to assess the effects of the heat treatments. Niobium microalloying additions were found to provide no hardness increase, but they extended the pearlitic regime to lower isothermal transformation temperatures.
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机译：这项研究调查了微合金化策略在两种共析钢（0.8C-0.5Mn-0.2Cr-0.08 V合金（wt。％）和相同的共铸钢）上进行工业专利热处理后提高高碳线材强度的可行性。含有额外的100 ppm铌。使用Gleeble 3500热机械模拟器（美国纽约州Poestenkill的Dynamic Systems Inc.）进行热处理，包括在1093 A摄氏度，950 A摄氏度或880 A摄氏度下奥氏体化30 s，然后进行15 s 650 A，625 A，600 A或575 A的等温转变步骤。进行了维氏硬度，场发射扫描电子显微镜和珠光体层间间距测量，以评估热处理的效果。发现铌微合金添加物没有增加硬度，但是它们将珠光体状态扩展到较低的等温转变温度。
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