热处理基本工艺对组织.doc

热处理工艺对30CrMnSiA组织和性能影响 学 科：材料成型及控制工程 本 科 生：康仕高 （署名） 指导老师：邹军涛 讲师 （署名） 摘 要 本文经过对30CrMnSiA复合钢进行不一样工艺条件下热处理。研究30CrMnSiA在不一样热处理状态及不一样热处理温度下组织和性能转化情况。采取金相光学显微镜观察其显微组织，并用X射线衍射仪分析30CrMnSiA组织中物相改变，测量不一样热处理条件下钢性能。研究结果表明： (1)30CrMnSiA钢在1100℃-1160℃高温退火过程中，伴随退火温度升高，钢组织中晶粒尺寸增大，但其硬度先下降后急剧上升。 (2)30CrMnSiA钢在820℃-880℃不一样温度淬火处理条件下，硬度伴随温度升高而逐步升高，不一样介质条件下淬火后，空冷后硬度较低而冷水淬火后硬度高达HRC50。 (3)30CrMnSiA钢在520℃回火处理下，组织中部分马氏体转变为奥氏体，钢硬度下降塑性上升。 关键词：高温退火，淬火，回火，30CrMnSiA钢，淬火介质 Effect of heat treatment on Microstructure and properties of 30CrMnSiA Subject: material forming and control Name：S.G.Kang (Signature) Supervisor: ZouJunTao (Signature) Abstract In this paper, through different heat treatment conditions on 30CrMnSiA composite steel. Transformation of the microstructure and properties of the different heat treatments and different heat treatment temperature of 30CrMnSiA. The microstructure was observed by means of optical microscope, X-ray diffraction analysis and 30CrMnSiA in phase change, measured in different heat treatment conditions the performance of steel. The results show that: (1)30CrMnSiA steel at 1100 ℃ -1160 ℃ high temperature annealing process, with the increase of annealing temperature, the grain size in the structure of steel increases, but the hardness decreased first and then increased sharply. (2) 30CrMnSiA steel at 820 ℃ -880 ℃ temperature quenching conditions, the hardness increases with the increase of temperature, different media conditions after quenching, air-cooled low hardness and water quenching hardness up to HRC50. (3) 30CrMnSiA steel during tempering at 520 ℃, part of body to austenite martensite, hardness decreased plasticity increase. Keywords: High-temperature annealing, quenching, tempering, 30CrMnSiA steel, quenching mediu 第一章 前 言 1.1调质钢 所谓调质钢，通常是指含碳量在0.3-0.6%中碳钢。通常见这类钢制作零件要求含有很好综合机械性能，即在保持较高强度同时又含有很