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首页> 外文会议>2010 International Symposium on Computer Communication Control and Automation >The use of high-temperature electric furnace process technology for the 18–8 stainless steel sensitized effects
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The use of high-temperature electric furnace process technology for the 18–8 stainless steel sensitized effects

机译：使用高温电炉工艺技术对18-8不锈钢进行增感作用

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Our experiment focuses on exploring the effects of the carbide precipitation on the mechanical properties and strain shape of type 18–8 within the sensitizing temperatures (475–850°C) in the hope of providing a helpful reference to the stainless steel industry when producing the stainless steel manufactures. We first heat up some specimens of 18–8(304) stainless steel individually in a high-temperature electric furnace to specific temperatures within the temperature range which the sensitizing treatment will be made easily, lasting for different periods of time at each temperature point and then we compare the toughness of each specimen. In addition, other specimens of 304 stainless steel are heated to four chosen sensitizing temperatures for 24 hours, observing the metallograph and sensitized phenomena for at individual temperature. To be well-rounded, we will also use the specimens of 304L for comparison purpose at the same time. Next, we proceed to the tension test, then the martensite transformation test with different strain ratios as well as the analysis of SEM & EDS to help understand well the effects of the sensitizing treatment on the stain shape. The results show as follows: Type 304 stainless steel (including 304 & 304L) dose produce carbide precipitation around the grain boundaries in the range of the sensitizing temperatures (475–850°C), which makes the number of Cr elements reduce in both sides of the grain boundaries and results in the chrome-deficiency areas. After tensile strain, the number of the slip lines in grains of type 304 stainless steel increases between 10%–40% strain ratios and the quantity of the grain transformation in all directions raises up accordingly. The strain shape becomes “branched shape” clearly when the strain goes greater. When the specimen is strained again in the strain ratio of 50%, they are finally broken since the stress reaches the maximu--m. With the raise of the strain ratio after tension, the quantity of the marten site of type 304 also increases. Both have a linear dependence on each other. The mechanical properties of 304L are usually not as good as those of 304 due to its low-carbon content. From the SEM observation, that there are definite precipitations around the grain boundaries, the higher the sensitizing temperatures go and the longer the temperatures endure, the more and definite the precipitation is. By means of the EDS element analysis, it is observed that what is found the most around the grain boundaries are Fe, Cr, and Ni elements; especially, Cr chemical composition is found in A, B & C areas beside the grain boundaries and the peak of Cr is pretty high.
机译：我们的实验着重探讨在敏化温度（475–850°C）内碳化物沉淀对18–8型机械性能和应变形状的影响，希望为生产不锈钢时的不锈钢行业提供有益的参考。不锈钢制品。我们首先将一些18–8（304）不锈钢样品分别在高温电炉中加热到可以轻松进行敏化处理的温度范围内的特定温度，并在每个温度点持续不同的时间。然后我们比较每个试样的韧性。此外，将其他304不锈钢试样加热到四个选定的敏化温度24小时，观察各个温度下的金相和敏化现象。为了更全面，我们还将同时使用304L的样本进行比较。接下来，我们进行张力测试，然后进行具有不同应变比的马氏体相变测试以及SEM和EDS分析，以帮助您更好地了解敏化处理对污渍形状的影响。结果表明：304型不锈钢（包括304和304L）在敏化温度（475-850°C）范围内在晶界周围产生碳化物沉淀，这使得两侧的Cr元素数量均减少。晶界的变化并导致铬缺乏区域。拉伸应变后，304型不锈钢晶粒中的滑移线数量在应变率10％至40％之间增加，并且在所有方向上的晶粒转变量相应增加。当应变变大时，应变形状明显变为“分支形状”。当样品再次以50％的应变率应变时，由于应力达到最大，最终断裂。 -- 米随着拉力后应变率的提高，304型马氏体部位的数量也增加了。两者相互之间具有线性相关性。 304L的机械性能因其低碳含量而通常不如304的机械性能。从SEM观察，在晶界周围有确定的沉淀，敏化温度越高，温度持续的时间越长，则沉淀越明确。通过EDS元素分析，观察到在晶界附近发现最多的是Fe，Cr和Ni元素。特别是在晶界附近的A，B，C区发现了Cr的化学成分，Cr的峰值很高。

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