渗硼温度对45钢渗硼层性能的影响

doi:10.13251/j.issn.0254-6051.2024.10.042

摘要/Abstract

摘要： 研究不同渗硼温度(800、850、900 ℃)对45钢渗硼层厚度、硬度、断裂韧度、脆性及耐蚀性的影响。利用维氏硬度计测试渗硼层的硬度、压痕裂纹形貌和压痕尖端裂纹长度;利用纳米硬度计测试渗硼层的弹性模量,并定量表征渗硼层的断裂韧度和脆性;利用电化学工作站对渗硼层的耐蚀性进行了表征。结果表明,经不同温度渗硼后,随渗硼温度的升高,渗硼层厚度和硬度增加,断裂韧度减小,脆性增加。800 ℃渗硼后渗硼层的自腐蚀电位最大,自腐蚀电流密度最小,耐蚀性最好。综合考虑,45钢最优渗硼工艺为800 ℃渗硼4 h。

关键词: 渗硼层, 硬度, 断裂韧度, 脆性, 耐蚀性

Abstract: Effect of different boronizing temperatures (800, 850, 900 ℃) on thickness, hardness, fracture toughness, brittleness and corrosion resistance of boronized layer on 45 steel was studied. The hardness, crack morphology of indentation and elastic modulus of boronized layer were tested by Vickers hardness tester. The elastic modulus of boronized layer was measured by nanohardness tester, and the fracture toughness and brittleness of boronized layer were characterized quantitatively. The corrosion resistance of boronized layer was characterized by electrochemical workstation. The results show that after boriding at different temperatures, as the boronizing temperature increases, the thickness and hardness of the boronized layer increase, the fracture toughness decreases and the brittleness increases. After boronizing at 800 ℃, the self-corrosion potential of the boronized layer is the highest, the self-corrosion current density is the lowest and the corrosion resistance is the best. Comprehensively, the optimal boronizing process for 45 steel is boronizing at 800 ℃ for 4 h.

Key words: boronized layer, hardness, fracture toughness, brittleness, corrosion resistance

中图分类号:

TG178

王兰, 谢远纳, 翁晨浩, 宋健峰. 渗硼温度对45钢渗硼层性能的影响[J]. 金属热处理, 2024, 49(10): 258-263.

Wang Lan, Xie Yuanna, Weng Chenhao, Song Jianfeng. Effect of boronizing temperature on properties of boronized layer on 45 steel[J]. Heat Treatment of Metals, 2024, 49(10): 258-263.

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