Influence of laser surface melting on the characteristics of Stellite 12 plasma transferred arc hardfacing deposit
Influence of laser surface melting on the characteristics of Stellite 12 plasma transferred arc hardfacing deposit
复制标题
DOI：
10.1016/j.surfcoat.2017.03.051
复制
发表时间：
2017-05
影响因子：
5.4
通讯作者：
Shaikh Asad Ali Dilawary;A. Motallebzadeh;A. Paksoy;M. Afzal;E. Atar;H. Cimenoglu
中科院分区：
文献类型：
--
作者：
Shaikh Asad Ali Dilawary;A. Motallebzadeh;A. Paksoy;M. Afzal;E. Atar;H. Cimenoglu
采用等离子转移弧（PTA）工艺在4140钢基体上堆焊Stellite 12耐磨堆焊合金，并对其进行激光表面熔化（LSM）处理。研究了LSM对PTA存款的影响，包括微观结构的变化和滑动磨损性能的变化。在PTA状态下，LSM工艺的应用改变了Co基体中由富Cr（Cr 7 C3和/或Cr23 C6）和复杂（（CoCrW）6C）碳化物组成的显微组织。总之，LSM工艺导致在表面上形成由碳化物缺乏区和富集区组成的双层，其厚度倾向于随着激光扫描速度的增加而减小。由于在最外表面形成了富碳化物区，LSM工艺提供了表面硬度的提高。另一方面，LSM工艺对耐磨性的积极影响在高磨损试验载荷下变得更加明显，导致Stellite 12 PTA堆焊存款的接触表面上的碳化物开裂和去除。
Stellite 12 hardfacing alloy deposited by plasma transferred arc (PTA) process on the 4140 steel substrate was subjected to laser surface melting (LSM) process. The effect of LSM on the PTA deposit was studied in terms of changes in microstructure and resultant variations in sliding wear properties. In the PTA state the microstructure, which consisted of Cr-rich (Cr7C3and/or Cr23C6) and complex ((CoCrW)6C) carbides in Co matrix, was altered upon the application of LSM process. In short, LSM process led to the formation of a duplex layer, on the surface, consisting of carbide deficient and rich zones whose thickness tended to decrease with increase in the laser scan speed. As the result of formation of carbide rich zone at the outermost surface, LSM process provided an enhancement in surface hardness. On the other hand, the positive effect of LSM process on wear resistance became more apparent at high wear testing load causing carbide cracking and removal on the contact surface of Stellite 12 PTA hardfacing deposit.