A novel multi-pass dual-indenter scratch test to unravel abrasion damage formation in construction steels
A novel multi-pass dual-indenter scratch test to unravel abrasion damage formation in construction steels
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DOI：
10.1016/j.wear.2014.10.011
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发表时间：
2015-01
期刊：
影响因子：
5
通讯作者：
Xiaojun Xu;S. Zwaag;W. Xu
中科院分区：
文献类型：
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作者：
Xiaojun Xu;S. Zwaag;W. Xu
正确理解耐磨性和相关的损伤机制在改进耐磨建筑钢的设计中至关重要。传统的划痕试验，在控制的载荷和速度下对着光滑表面滑动刚性压头，模拟磨损过程的性质，可用于评估各种微结构的耐磨性。然而，划痕测试主要在初始表面上进行，其可能与在磨损过程中形成的表面非常不同，因此不能真实地反映其耐磨响应。在目前的工作中，一个新的划痕试验方法是开发接近真实的磨损条件进行多道双压头划痕试验，其中一个小压头划痕预划伤表面产生的大压头。选择了5种具有不同加工硬化能力的钢种，即无间隙原子铁素体钢（IF钢）、全马氏体钢（FM钢）、双相钢（DP钢）、淬火分配钢（Q&P钢）和孪晶诱导塑性钢（TTRIP钢）。通过系统的抗划伤实验研究了其损伤机制、加工硬化行为和亚表层变形层的发展。结果表明，在磨损表面下形成的加工硬化层起着决定耐磨性的主导作用。DP、Q&P和TTRO钢等级显示出上级的耐刮擦性和耐磨性，尽管与具有完全马氏体显微组织的相应钢相比，它们的硬度相对较低。
A proper understanding of abrasion resistance and associated damage mechanisms is of vital importance in the design of improved abrasion resistant construction steels. The conventional scratch test, sliding a rigid indenter under a controlled load and speed against a smooth surface, mimics the nature of the abrasion process and can be used to evaluate the abrasion resistance of various microstructures. However, scratch tests are mostly done on the initial surface, which can be very different from that formed during the abrasion process and hence do not truly reflect its abrasion resistant response. In the present work, a new scratch test methodology is developed to approach the real abrasion condition by carrying out a multi-pass dual indenter scratch tests, in which a small indenter scratches a pre-scratched surface produced by a large indenter. Five steel grades with different work hardening capacities, i.e. Interstitial-Free Ferritic steel (IF steel), Fully Martensitic steel (FM steel), Dual Phase steel (DP steel), Quench Partitioning steel (Q&P steel) and TWining Induced Plasticity steel (TWIP steel) were selected. Systematic scratch resistance experiments were performed to investigate the damage mechanisms, the work hardening behavior and the development of subsurface deformation layers. Results suggest that the work hardening layer formed beneath the abraded surface plays the dominant role in determining the abrasion resistance. Steels grades of DP, Q&P and TWIP display superior scratch and abrasion resistances, notwithstanding their relative low hardness compared to that of a corresponding steel with a fully martensitic microstructure.