闭挤式精冲成形表面残余应力与耐腐蚀性实验分析（修改）
Residual Stress and Corrosion Resistance Experimental Analysis of Closed Extruding Fine Blanking Parts Surface
吕琳，宁国松，陈明明
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作者单位：重庆理工大学材料科学与工程学院
中文关键字：闭挤式精冲；残余应力；极化曲线；耐腐蚀性
英文关键字：closed extruding fine blanking, residual stress, polarization curve, corrosion resistance
中文摘要：为了研究闭挤式精冲成形后工件的残余应力分布规律以及耐腐蚀性能，对闭挤式精冲件进行了表面和层深残余应力分析，同时通过极化曲线试验方法研究了工件在3.5%NaCl溶液中的腐蚀电化学行为。结果表明：工件表面残余应力为压应力，压应力数值随变形程度增大而增大，最大值为150Mpa左右；随着层深的增加，残余压应力先增大后减小，在次表层达到最大值，残余应力场的深度为200μm左右；在极化曲线试验中，闭挤式精冲件初期耐蚀性优于车削件和坯料，但随着腐蚀实验的进行，耐蚀性反而下降，且闭挤式精冲件最终钝化现象较车削件和坯料延迟。
英文摘要：In order to research the residual stress distribution and corrosion resistance of closed extruding fine blanking parts, surface and deep layer residual stress was tested and electrochemical corrosion behavior was also researched through polarization curve test in the 3.5%NaCl solution. The results show that: the surface’s residual stress is compressive stress, compressive stress value increases with the deformation degree, and the maximum value is 150 Mpa or so; Along with increase of depth from surface, residual stress first increases, then decreases, it is on the inferior surface reaches to maximum value, and the influence depth is 200μm; In the polarization curve test, closed extruding fine blanking parts' initial corrosion resistance is better than turning parts and blank, but with the test proceeding, the corrosion resistance drops, and closed extruding fine blanking parts’ final passive phenomenon delays.