高频淬火加热时间对钢管表面组织和性能的影响

发布时间：2019-05-24 22:31

【摘要】：目的确定高频淬火后零件出现软点的原因,通过调整工艺参数以获得合格组织。方法通过直读光谱测试工件化学成分,采用体视显微镜、金相显微镜和扫描电镜观察试样的宏观与微观组织,分析工件的淬火层深度和显微组织形态。通过能谱仪测试样品淬火组织的成分差异。梳理生产过程,确定淬火零件软点形成的原因。结果通过扫描电镜配置的能谱仪测试发现,产生软点的样品黑色区域马氏体的碳含量较高,白色区域马氏体碳含量较低;未产生软点的样品黑区和白区马氏体的碳含量差别不大。结论高频淬火零件事先未经调质处理,碳含量分布不匀,高频淬火时间短,碳原子没有得到充分扩散,淬火后的零件在组织中形成了高碳和低碳马氏体两种结构,导致淬火后零件出现软点。
[Abstract]:Objective to determine the cause of soft spots in parts after high frequency quenching, and to obtain qualified organization by adjusting process parameters. Methods the chemical composition of the workpiece was measured by direct reading spectrum. The macro and microstructure of the sample were observed by stereoscopic microscope, metallographic microscope and scanning electron microscope, and the depth and morphology of quenching layer of the workpiece were analyzed. The composition difference of quenching structure of the sample was measured by energy dispersive spectrometer. Carding the production process to determine the reasons for the formation of soft spots in quenched parts. Results by scanning electron microscope (SEM), it was found that the carbon content of martensite in black area was higher and that in white area was lower in the samples with soft spots. There is no difference in the carbon content between the black and white areas of the samples without soft spots. Conclusion the high frequency quenching parts have not been quenched and tempered in advance, the distribution of carbon content is uneven, the high frequency quenching time is short, and the carbon atoms are not fully diffused. The quenched parts form two kinds of structures of high carbon and low carbon martensite in the microstructure. Cause soft spots of parts after quenching.
【作者单位】：河北农业大学机电工程学院;
【分类号】：TG142.1;TG162.84

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