激光增材制造H13钢及回火处理的组织和性能

发布时间：2018-03-09 08:22

  本文选题：激光增材制造　切入点：H钢　出处：《中国表面工程》2017年02期 　论文类型：期刊论文

【摘要】：利用激光增材制造技术成功制备了H13钢,并研究了回火处理对其显微组织和性能的影响。通过光学显微镜、SEM以及XRD衍射仪对各试样进行分析。结果表明,激光增材制造H13钢显微组织主要为马氏体、残余奥氏体以及细小碳化物,回火处理使得马氏体向回火马氏体转变,同时有细小合金碳化物析出。当回火温度超过550℃时,碳化物开始粗化。随回火温度升高,显微硬度呈先升后降的趋势。550℃回火后,试样硬度达到峰值600 HV_(0.3)。摩擦磨损测试结果表明,不同处理状态下各试样主要以粘着磨损为主,同时包含轻微氧化磨损。与沉积态试样相比,550℃回火后,试样耐磨性提高了2倍;650℃回火2 h后,由于基体软化,试样的耐磨性能最差。拉伸测试表明,当回火温度低于550℃时,断口主要以解理断裂为主,550℃回火时抗拉强度最大,为1 928.2 MPa,延伸率为6.4%;当回火温度升高到600~650℃时,断口呈现出韧性断裂,抗拉强度降低,延伸率增大。
[Abstract]:H13 steel was successfully prepared by laser material augmentation technology, and the effect of tempering treatment on microstructure and properties of H13 steel was studied. The samples were analyzed by optical microscope and XRD diffractometer. The microstructure of H13 steel is mainly martensite, residual austenite and fine carbides. The tempering treatment results in the transformation of martensite to tempered martensite and the precipitation of fine alloy carbides. Carbides began to coarsening. With the tempering temperature increasing, the microhardness increased first and then decreased. After tempering at 550 鈩，

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