20钢液体渗碳工艺及性能研究分析毕业论文

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1、摘要液体渗碳就是钢件在液体渗碳介质中加热保温，使碳原子渗入钢件表面，使其表面的碳浓度发生改变，从而获得具有一定表面含碳量和一定浓度梯度的热处理工艺。当前液体渗碳正着无毒无污染的方向进行，像NaCl无毒液体渗碳剂、603无毒液体渗碳剂及其改进行、QPQ技术等。本文主要研究了20钢在经过液体渗碳后的组织与性能，并研究了液体渗碳的渗剂、工艺参数，并且与未经过此渗碳的工艺进行了分析对比。液体渗碳剂由基盐、催渗剂、渗碳剂组成，工艺简单，便于实施，是一种可获得渗层性能好的化学热处理方法。通过渗碳、淬火、回火处理，发现随着加热温度的升高，工件表面硬度和渗层厚度不断增加，随着加热时间的增加，工件表

2、面硬度和渗层厚度也不断增加。关键词：20钢液体渗碳耐磨硬度渗碳剂AbstractLiquidcarburizingiscarburizingsteelpartsinaliquidmedium，heatinsulation，ofcarbonatomsintothesurfaceofsteel,tochangethecarbonconcentrationofthesurface,toobtainacertainsurfaceconcentrationgradientofcarboncontentandheattreatmentprocessmust.Liquidcarburizingi

3、sthecurrentdirectionofthetoxicpollution,NaClasnon-toxicliquidcarburizingagents,603non-toxicliquidcarburizingagentsandtheirchangeswere,QPQtechnology.Thispaperstudiestheliquidafterthe20steelandpropertiesaftercarburizing，andtostudythepenetrationofliquidcarburizing，processparametersandtheapplicati

4、onprocessin20steel,Andwithatotalpenetrationofthistechnologyhasnotbeenanalyzedandcompared.Liquidcarburizingagentfromthebasesalt,composedofcarburizingagent,processissimple,easytoimplement，Nitridedlayerisagoodperformanceofavailablechemicaltreatmentmethods.Bycarburizing,quenchingandtemperingtreatm

5、ent,foundthatincreasingtheheatingtemperatureincreases,surfacehardnessandthicknessoftheincreasinginfiltration,withtheincreaseofheatingtime,infiltrationsurfacehardnessandthicknessarealsoincreasing.朗读显示对应的拉丁字符的拼音 字典Keywords:20steelliquidcarburizingwearhardnesscarburizingagent目录摘要·················

6、···················································ⅠAbstract································································Ⅱ第1章绪论····························································11.1项目的发展背景··················································11.2项目发展趋势和研究意义····························

7、··············1第2章材料分析························································22.1材料分析························································22.1.120钢的成分特点············································22.1.220钢的用途························