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编辑同志.您们好, 我厂生产的大中型柴油机气缸套备件,用材为CrMoCu灰铸铁, 产品加工到最后两道工序,进行化学热处理(氮化),随炉附试片,氯化后进行金相检验(测量渗氦层深度).我用硬度梯度法测量,高出基体50HV_(0.3)处为渗层深.我在检验过程中发现测在不同部位,渗层表面硬度与梯度不相符;基体不同,相差甚远,约50HV_(0.3),因此很难确定该渗层的深度.请问是否有更好的办法解决该材料渗氮处理及随后金相检验的难题,望予赐教.
Hello, my factory production of large and medium-sized diesel engine cylinder liner spare parts, the material is CrMoCu gray cast iron, the product processing to the last two processes, chemical heat treatment (nitriding), with the furnace attached to the test piece, after chlorination Metallographic examination (measuring the depth of the infiltrated helium layer.) I measured by the hardness gradient method, higher than the substrate 50HV_ (0.3) at the depth of the infiltration layer .I found in the test found in different parts of the infiltration layer surface hardness and gradient do not match It is difficult to determine the depth of this layer because of the different matrix, which is quite different from that of 50HV_ (0.3) .If there is a better way to solve the problem of nitriding and the subsequent metallographic examination of the material, we hope to give enlightenment.