锻压技术

含硼钢管状扭力梁热处理脱碳层对疲劳性能的影响

英文标题：Influence of heat treatment decarburization layer on fatigue performance for boron steel tubular torsion beam

作者：徐小华

分类号：TG394

出版年,卷(期):页码：2021,46(4):235-240

摘要：

针对含硼钢扭力梁疲劳开裂问题，采用含硼钢BR1500HS为原材料，按照制管、预成形、液压成形、热处理、喷砂、激光切割等工艺制造扭力梁零件，通过台架试验对零件进行扭转疲劳性能测试，分析了台架试验过程中零件疲劳开裂后扭力梁的断口形貌、应力、应变、原始奥氏体晶粒度和金相显微组织。研究结果表明：含硼钢扭力梁台架试验中应力较大的位置均位于扭力梁“V”形开口处；含硼钢扭力梁零件在热处理之后，表面存在一定深度的脱碳层，该脱碳层对零件的显微硬度和零件的疲劳性能有显著影响，通过优化热处理工艺，降低了脱碳层深度，提高了含硼钢扭力梁的疲劳性能。

For the problem of fatigue cracking for boron steel torsion beam, BR1500HS boron steel was made into torsion beam parts by tube making, pre-forming, hydroforming, heat treatment, sandblasting, laser cutting and other processes, and the fracture morphology, stress and strain, original austenite grain size and microstructure of torsion beam after fatigue cracking of parts during bench test were analyzed by the bench test measuring torsion fatigue performance. The results show that in the bench test of boron steel torsion beam, the positions with higher stress are all located at the V-shaped opening of torsion beam, and after heat treatment, the surface of boron steel torsion beam has a certain depth of decarburization layer, which affects the microhardness and the fatigue performance of parts significantly. Thus, by optimizing the heat treatment process and reducing the depth of decarburization layer, the fatigue performance of boron steel torsion beam is improved in the bench test.

基金项目：

徐小华（1987-），男，硕士，工程师 E-mail：xuxiaohua@baosteel.com

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