The comparative study of thermal fatigue behavior of H13 die steel with biomimetic non-smooth surface processed by laser surface melting and laser cladding
The comparative study of thermal fatigue behavior of H13 die steel with biomimetic non-smooth surface processed by laser surface melting and laser cladding
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DOI：
10.1016/j.matdes.2013.05.005
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发表时间：
2013-10-01
影响因子：
8.4
通讯作者：
Ren, Luquan
中科院分区：
文献类型：
--
作者：
Meng, Chao;Zhou, Hong;Ren, Luquan
研究表明，激光表面熔化（LSM）仿生非光滑表面处理热作工具钢的热疲劳性能得到了显著改善。然而，LSM非光滑单元的性质在热循环过程中退化。为了改善非光滑单元在热循环过程中的性能，采用激光熔覆（LC）技术制备非光滑单元。研究了热疲劳试验前后LSM和LC处理非光滑单元的显微组织和显微硬度。结果表明，LC处理的非光滑试样比LSM处理的非光滑试样能更有效地改善热疲劳性能。在热疲劳试验中，LC非光滑单元比LSM非光滑单元具有更好的抗热循环软化性能。在热疲劳试验后，检测到LSM非光滑单元的显微组织的明显变化，即，非光滑单元的晶粒明显变粗。而LC非光滑单元的微观结构在热疲劳试验后没有明显变化。(c)2013爱思唯尔有限公司保留所有权利。
According to previous studies, the thermal fatigue behavior of hot-work tool steel with biomimetic non-smooth surface treated by laser surface melting (LSM) gets a significant improvement. However, the properties of LSM non-smooth unit degenerate during thermal cycles. In order to improve the properties of non-smooth unit during thermal cycles, laser cladding (LC) was employed to fabricate the non-smooth unit. Before and after thermal fatigue testing, the microstructure and microhardness of non-smooth unit treated by LSM and LC have been investigated. The results showed that the non-smooth sample processed by LC is more effective to improve thermal fatigue behavior than that treated by LSM. During the thermal fatigue testing, LC non-smooth unit had better resistance to thermal cycles softening compared with LSM non-smooth unit. After thermal fatigue testing, a distinct change of the microstructure of LSM non-smooth unit was detected, i.e., the grains of the non-smooth unit became coarsening obviously. However, the microstructure of LC non-smooth unit was not changed significantly after thermal fatigue testing. (c) 2013 Elsevier Ltd. All rights reserved.