45钢高温淬火工艺参数对组织的影响

摘要：45号钢是常用中碳调质结构钢。在现实生活中具有广泛的应用。本次实验是通过研究45号钢经不同加热温度和保温时间后的组织特征和硬度，来寻求最适合45号钢的热处理工艺。通过取样，磨样，抛光，腐蚀后的样品，在不同淬火温度和保温作用下产生不同的金相组织和不同的硬度。本次实验中采用的淬火温度分别是840℃，880℃和930℃。淬火保温时间分别为2min，5min，10min，其中在840℃下增设一个保温30min的方案，来进行对比，确认是否保温时间越长越好。通过本次实验，发现45号钢短时高温淬火后，组织在加热温度和保温时间的互相配合下，可以得到最佳强度和硬度，即在880℃下保温5min时硬度最高，这样的温度和时间可以在生产中节约大量成本，对中小型企业的生产具有现实意义。48713

毕业论文关键词： 45号钢；高温淬火；金相组织；硬度

High temperature of 45 steel quenching process parameters on the influence of the organization

Abstract：45 # steel is commonly used in carbon quenched and tempered steel.With wide application in real life. This experiment is through the research of 45 # steel after different heating temperature and holding time of the structure characteristics and hardness, to seek the most suitable for 45 steel heat treatment process. Through sampling, grinding, polishing, etching after samples, under the action of quenching process, produce the different microstructure and hardness. This experiment adopts the quenching temperature is 840 ℃ respectively, 880 ℃ and 930 ℃. Hardening holding time is respectively 2 min, 5 min, 10 min, which add a insulation under 840 ℃ for 30 min, to compare and confirm whether holding time as long as possible. Through this experiment, found that after short time high temperature quenching of 45 steel, the organization in conjunction with the heating temperature and holding time of each other, can get the best strength and hardness. The highest hardness when under 880 ℃ heat preservation 5 min, the temperature and time can save a lot of cost in production, production has a realistic significance for small and medium enterprises.

Keywords： 45 # steel；High temperature quenching；The microstructure；hardness

1.绪论 2

1.1 碳素钢的介绍 3

1.2 45号钢 3

1.3 钢的热处理简介 4

1.3.1整体热处理 4

1.3.2 表面热处理 5

1.3.3 化学热处理 5

1.4 淬火热处理工艺 5

1.5高温淬火热处理工艺 6

1.6 选题的目的与意义 7

1.6.1 选题的目的 7

1.6.2 选题的意义 8

2.实验材料及热处理实验 9

2.1 实验材料 9

2.2 淬火热处理工艺的制定 10

2.3 淬火热处理实验 10

2.4 金相制作 11

2.5 金相组织观察 14

2.6硬度测量 14

3.实验结果及分析 15

3.1 金相组织及分析 15

3.1.1 840℃不同保温时间组织对比 45钢高温淬火工艺参数对组织的影响:http://www.751com.cn/cailiao/lunwen_51395.html