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Performance of TiC Laser Engineered Coatings in Molten Aluminum Environment

机译：熔融铝环境中TIC激光工程涂层的性能

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摘要

There is a growing interest in the application of intermetallic and ceramic coatings, and surface treatments to extend the die-casting die life. These coatings reduce the molten metal corrosion and erosion to the die. Due to its excellent corrosion and highly abrasion resistant nature titanium carbide is a suitable candidate for coating die-casting dies. Amongst the different surface treatments and coating technologies currently in use, laser surface engineering is very attractive due to its (i) flexibility, (ii) possibility to process under non-equilibrium conditions involving high solidification rates (10~3-10~8 K s~(-1)), (iii) production of metastable phases and (iv) extension of solid-solubility limit. This paper presents the results of a study involving isothermal corrosion testing of laser surface treated and TiC laser coated H13 steel under accelerated erosion/corrosion conditions. The effects of grain size of TiC coating and different laser surface treatment parameters on corrosion behavior of H13 die steel in aluminum casting alloy A390 have been investigated. Significant improvement in corrosion resistance was achieved for the steel coated with TiC. The finer grain size and laser shot peening contribute significantly towards improving corrosion resistance of steel in molten aluminum. Based on microhardness measurement the effectiveness of the coatings along with the possible reason for their behavior is presented.
机译：对金属间和陶瓷涂层的应用，以及表面处理延长压铸模具寿命，存在越来越兴趣。这些涂层可减少熔融金属腐蚀和侵蚀模具。由于其优异的腐蚀和高度耐磨性的碳化钛是涂层模具的合适候选者。在目前使用的不同表面处理和涂层技术中，激光表面工程由于其（i）灵活性，（ii）在涉及高凝固率的非平衡条件下处理（10〜3-10〜8k S〜（1）），（III）生产亚稳态阶段和（IV）延伸的固体溶解度极限。本文介绍了涉及激光表面处理和TIC激光涂层H13钢的等温腐蚀试验的研究结果，加速侵蚀/腐蚀条件。研究了TIC涂层的晶粒尺寸和不同激光表面处理参数对铝铸造合金A390中H13模钢腐蚀行为的影响。涂有TIC的钢实现了耐腐蚀性的显着改善。更精细的晶粒尺寸和激光射击喷丸在熔融铝中提高钢的耐腐蚀性贡献。基于微硬度测量涂层的有效性以及其行为的可能原因。

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