| 8407钢压铸模工作面麻点失效分析 |
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| 引用本文： | 孟鑫沛,金林奎,林权,黄仪浩,方曼婷,黎肖辉,何平.8407钢压铸模工作面麻点失效分析[J].金属热处理,2021,46(12):289-293. |
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| 作者姓名： | 孟鑫沛 金林奎 林权 黄仪浩 方曼婷 黎肖辉 何平 |
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| 作者单位： | 1.东莞职业技术学院 精密智造技术研究与应用工程中心, 广东 东莞 523808;2.广东省东莞市质量监督检测中心, 广东 东莞 523808;3.国家模具产品质量监督检验中心, 广东 东莞 523808 |
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| 基金项目： | 广东大学生科技创新培育专项资金(pdjh2020a1262);广东省东莞市产学研合作项目(201950901500294) |
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| 摘 要： | 8407钢压铸模具在使用过程中工作面出现麻点,对其进行抛光处理,而经抛光加工后再次使用,模具工作面仍出现麻点。采用金相显微镜及扫描电镜等仪器设备,对压铸模具失效件的化学成分、表面缺陷形貌特征及显微组织进行检测和分析。结果表明,模具工作面表面麻点处存在凹坑,凹坑周围及底部均存在不同程度的开裂,并在凹坑边缘形成斜坡状的压痕。模具工作面凹坑未发现氧化、腐蚀等化学反应,表明该凹坑由于挤压变形造成。压铸模工作面麻点产生的原因是抛光过程中加工强度过大,模具工作面表层已经形成高温快冷的白亮色淬火组织,淬火组织应力造成工作面的横向开裂,并形成局部纵向裂纹。在表面抛光热影响作用下,工作面次表层产生退火软化,因而形成变形的纤维状组织。模具在使用过程中,工作面表层纵向裂纹处被压塌形成凹坑,造成模具工作面宏观可见的表面麻点,导致锌合金压铸件产品表面凸起的外观缺陷。
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| 关 键 词： | 8407钢压铸模 淬火组织 横向开裂 麻点失效分析 |
| 收稿时间： | 2021-06-17 |
Failure analysis of pitting on working surface of die-casting mold made of 8407 steel |
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| Meng Xinpei,Jin Linkui,Lin Quan,Huang Yihao,Fang Manting,Li Xiaohui,He Ping.Failure analysis of pitting on working surface of die-casting mold made of 8407 steel[J].Heat Treatment of Metals,2021,46(12):289-293. |
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| Authors: | Meng Xinpei Jin Linkui Lin Quan Huang Yihao Fang Manting Li Xiaohui He Ping |
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| Affiliation: | 1. Precision Intelligent Manufacturing Technology Research and Application Engineering Center, Dongguan Polytechnic, Dongguan Guangdong 523808, China;2. Guangdong Dongguan Quality Supervision Testing Center, Dongguan Guangdong 523808, China;3. National Mold Product Quality Supervision and Inspection Center, Dongguan Guangdong 523808, China |
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| Abstract: | The die-casting mold made of 8407 steel was re-polished to remove the surface pits appeared in service, however, the pitting appeared again on the working surface in re-using of the die. The chemical composition, surface defect features and microstructure of failed die-casting mold parts were analyzed by means of metallographic microscope, scanning electron microscope and others. The results show that there are different degrees of cracking around and at the bottom of the surface pits, and slope-like indentations are formed on the edges of the pits. No chemical reactions such as oxidation and corrosion are found in the pits on the working surface of the mold, which implies that the pits are caused by extrusion deformation. The reason for the pitting on the working surface of the die-casting mold is that the polishing process is too strong, so that bright quenching structure forms in the surface layer of the mold working surface caused by high temperature and rapid cooling, and the resulted stress causes transverse crack of working face and form local longitudinal cracks. Under the influence of the heat from surface polishing, the secondary surface layer of the working surface is softened by annealing, thus forming a deformed fibrous structure. In the using process of the die, the longitudinal cracks on the working surface are crushed to form pits, which causes the surface macro-pits on the working surface of the mold, leading to the raised appearance defects on the surface of die-casting products of zinc alloy. |
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| Keywords: | 8407 steel die-casting mold quenching structure transverse crack pitting failure analysis |
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