Synchrotron and neural network analysis of the influence of composition and heat treatment on the rolling contact fatigue of hypereutectoid pearlitic steels
Synchrotron and neural network analysis of the influence of composition and heat treatment on the rolling contact fatigue of hypereutectoid pearlitic steels
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成分和热处理对过共析珠光体钢滚动接触疲劳影响的同步加速器和神经网络分析
DOI：
10.1016/j.msea.2017.09.045
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Solano-Alvarez W
中科院分区：
文献类型：
--
作者：
Solano-Alvarez W
为了研究不同化学成分和热处理工艺对过共析珠光体钢滚动接触疲劳寿命的影响，在双圆盘润滑条件下进行了一系列过共析珠光体钢的滚动接触试验。然后使用显微镜和同步加速器测量作为接触表面深度的函数来表征测试样品。通过神经网络分析表明，对延长过共析钢裂纹萌生循环次数影响最大的因素是硬度，硬度是通过提高热轧温度的冷却速度获得的，但适当的合金化可以进一步提高硬度。较硬的快速冷却的样品比较软的缓慢冷却的样品在表面上显示的塑性流动较少。在化学成分方面，发现硅强化了铁素体，从而减少了与渗碳体的应变不相容，从而防止了片层的破碎和最终的溶解。这是有益的，因为在给定的冷却速度(硬度)下，在裂纹萌生周期较短的样品中发现了更深的渗碳体溶解。在硬度相近的情况下，含钒的样品比不含钒的样品寿命更长，表面塑性变形更小。
A series of experimental hypereutectoid pearlitic steels were tested under rolling contact sliding conditions using a lubricated twin-disc setup to study the influence of different chemical compositions and heat treatments on rolling contact fatigue life. Tested samples were then characterised using microscopy and synchrotron measurements as a function of depth from the contact surface. Results, analysed through neural networks, indicate that the most influential factor in lengthening the number of cycles to crack initiation of hypereutectoid steels is hardness, attained by increasing the cooling rate from the hot rolling temperature, but adequate alloying additions can enhance it further. The harder, fast-cooled samples displayed less plastic flow at the surface than the softer slow-cooled ones. With regard to chemical composition, silicon was found to strengthen the ferrite thus reducing strain incompatibilities with the cementite, preventing in this way the fragmentation and eventual dissolution of the lamellae. This is beneficial since larger depths of cementite dissolution were found in samples with lower cycles to crack initiation for a given cooling rate (hardness). Samples containing vanadium lasted longer and displayed less plastic deformation at the surface than those without, at a similar hardness.
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