Selective Laser Melting Forming Process Optimization of 12Cr9NiAlMo DieSteel and Microstructure and Properties after Heat Treatment
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摘要: 通过正交试验研究了激光功率、扫描间距、扫描速度等工艺参数对选区激光熔化成形12Cr9NiAlMo模具钢相对密度的影响，获得最佳工艺参数；研究了固溶时效处理后最优工艺成形试样的组织和性能。结果表明：激光功率对成形试样相对密度的影响程度最大，其次为扫描间距，最优工艺参数为激光功率325 W、扫描间距0.10 mm、扫描速度1 000 mm·s-1，此时相对密度为99.22%；热处理后最优工艺成形试样中部分残余奥氏体转变为马氏体，并析出大量细小NiAl相，抗拉强度、屈服强度和硬度相比于未热处理分别提高了62.1%，59.6%，41.2%，断后伸长率和冲击吸收功降低了40.0%，81.3%。
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关键词:
- 12Cr9NiAlMo模具钢 /
- 选区激光熔化 /
- 固溶时效处理
Abstract: The influence of laser power, scanning spacing and scanning speed on the relative density of selective laser melting formed 12Cr9NiAlMo steel was studied by orthogonal experiments, and the optimal process parameters were obtained. The structure and properties of samples formed by the optimal process after solution and aging treatment were studied. The results show that the laser power had the greatest effect on the relative density of the formed samples, followed by the scanning spacing. The optimal process parameters were laser power of 325 W, scanning space of 0.10 mm, and scanning speed of 1 000 mm·s-1, and the relative density was 99.22%. After heat treatment, part of the residual austenite in samples formed by the optimal process was transformed to martensite, and a large number of fine NiAl phase precipitated. The tensile strength, yield strength and hardness increased by 62.1%, 59.6%, 41.2%, and the percentage elongation after fracture and impact absorbing energy decreased by 40.0%, 81.3%, comparing with those without heat-treatment. -
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