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本文对渗硼层的脆性破坏形式及其影响因素进行了分析,并就改善渗硼层脆性的各种方法作了归纳和比较。 本文重点研究的是激光处理对渗硼层脆性的影响,得出如下结论: 1、激光处理是改善渗硼层脆性的有效手段,韧性提高11.5～49.3%,断裂强度增加17.3～33.1%,相对剥落脆性减少27.8～51.0%。 2、利用涡流探伤技术可准确可靠地测定渗硼层的开裂点,配合力学性能试验便能测算其韧性和断裂强度:利用磨削试验法可测定渗硼层的脆性剥落性能。 3、激光处理改善渗硼层脆性的基本原因是:获得了细化的硼化物晶粒和硬度较低的共晶组织,改变了表面残余应力的分布。
In this paper, the brittle failure mode of boride layer and its influencing factors are analyzed, and various methods to improve brittleness of boronizing layer are summarized and compared. This paper focuses on the influence of laser treatment on the brittleness of boronizing layer, and draws the following conclusions: 1, Laser treatment is an effective means to improve the brittleness of boronizing layer, toughness increased by 11.5 ~ 49.3%, the breaking strength increased by 17.3 ~ 33.1% Flake brittleness decreased by 27.8 ~ 51.0%. 2, Eddy current testing technology can be used to accurately and reliably measure the cracking point of the boronizing layer, and its toughness and fracture strength can be calculated in accordance with the mechanical property test: The brittle spalling property of the boronizing layer can be measured by the grinding test method. 3. The basic reason why the laser treatment improves the brittleness of the boronizing layer is that the refined boride grains and the eutectic structure with lower hardness are obtained and the distribution of the surface residual stress is changed.