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摘要：本文介绍了18CrMnTi渗碳零件加热工艺参数对淬火组织的影响。分别研究了钢渗碳缓冷状态和渗碳样品淬火后的表层组织、过渡组织以及心部组织的组织变化和硬度变化。淬火工艺参数定为：淬火温度定为770℃、800℃、830℃和860℃，保温时间定为25min。结果显示原始渗碳缓冷试样的组织为表层为珠光体，过渡层是珠光体加铁素体，越靠近心部铁素体越多珠光体越少，心部是也是珠光体加铁素体；770℃和800℃淬火后试样的表层组织为高碳马氏体加少量残余奥氏体，过渡层组织为马氏体加铁素体再加少量残余奥氏体，且越靠近心部铁素体含量逐渐增多，心部组织为低碳马氏体加铁素体再加少量残余奥氏体；而830℃和860℃淬火试样的整个截面上都是马氏体组织。原始渗碳缓冷试样的表层最高硬度为420.6Hv,渗碳层深度是1.3mm，770℃、800℃、830℃和860℃淬火试样表层最高硬度分别是819.7Hv、839.5Hv、928.1Hv和834.1Hv,淬硬层深度分别是1.8mm、1.9mm、2.0mm和1.8mm。34390
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毕业论文关键词： 渗碳；18CrMnTi；淬火
Influence of heating process parameters of carburizing steel on Microstructure of quenching
Abstract：This article describes the impact 18CrMnTi carburizing parts heating process parameters on the hardened structure. Studied the organizational changes and changes in the surface structure of the steel hardness carburizing and carburizing slow cold state sample after quenching, the transition of organizations and heart tissue. Quenching process parameters as: quenching temperature to 770 ℃, 800 ℃, 830 ℃ and 860 ℃, holding time set at 25min. The results showed that the original carburizing slow cooling of the sample surface for pearlite organization, transition pearlite and ferrite, closer to the more central portion of ferrite pearlite fewer, the center is also pearlite plus ferrite body; skin tissue after 770 ℃ and samples quenched at 800 ℃ high carbon martensite plus a small amount of residual austenite transition martensite plus ferrite plus a small amount of residual austenite and closer to the heart Ministry of ferrite content gradually increased, the center organized a low carbon martensite and ferrite plus a small amount of residual austenite; and the entire cross-section of martensite are 830 ℃ and 860 ℃ and quenching. Original carburizing slow cooling of the sample surface up to a hardness of 420.6Hv, case depth is 1.3mm, 770 ℃, 800 ℃, the surface 830 ℃ and 860 ℃ quenching, the maximum hardness are 819.7Hv, 839.5Hv, 928.1Hv and 834.1Hv, hardened layer depth, respectively 1.8mm, 1.9mm, 2.0mm and 1.8mm.
Key Words: Carburization; 18CrMnTi; Quench
目录
1 绪论 1
1.1渗碳钢简介 1
1.2 渗碳件一般加工工艺路线 1
1.3 渗碳的介绍 1
1.4 渗碳零件淬火的作用 2
1.5 课题现状 2
1.6 选题的目的和意义 4
2 实验材料及实验方法 5
2.1 实验材料 5
2.1.1 渗碳钢的成分 5
2.1.2 渗碳钢的加热临界温度 6
2.1.3 渗碳样品形状尺寸 6
2.2 实验方法 6
2.2.1 原始样品的金相制样 6
2.2.2 原始样品的金相观察 6
2.2.3 渗碳样品淬火工艺参数 7
2.2.4 淬火后试样的金相制样 7
2.2.5 淬火后试样的金相观察 7
2.2.6 原始样品及淬火后样品的硬度测定 7
2.3 实验用料及仪器 10
3 实验结果及分析 11
3.1 原始渗碳缓冷样品的组织分析 11
3.2 原始试样的硬度分析 13