【摘要】 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。更多还原

【Abstract】 In this paper the form and influential factors of brittleness breakdown. have been analysed. And all methods of improving boronising brittleness have been compared and summed up.The authors have studied emphatically the influence laser treatment on brittleness of boronising layer. The conclusion arrived is as follows:1. The laser treatment is an effictive method for improving brittleness of boronising layer. The toughness can be increased by 11.5-49.3%;The fracture strength added by 17.3-33.1%; The relative stripping brittleness reduced by 27.8-51.0%.2. Using the votex delectional technology, the crack-point of boronising layer can be accurately and reliably measured. In cooperation with the test of materials, the toughness and fracture strength cau be measured. Using the grinding method, the stripping brittleness of boronising layer can be determined.3. The fundamental reason for using laser treatment to improve brittleness of boronising layer is that the boronide refinement grain and the lower hardness eutectic structure are obtained. So the distribution of residual microstress of surface is changed.更多还原