（毕业设计论文）《40Cr连杆用水溶性淬火液的研制》.doc

摘 要 本文是研制一种针对40Cr连杆锻造余热淬火的水基淬火液，代替价格高又不能保证生产安全的淬火油，本文主要是利用具有降低淬火冷却速度的水玻璃、加快冷却速度的氯化钠和碳酸钠以及作为保持悬浊液稳定的氢氧化钠做溶质，自来水做溶剂，通过调整溶质比例，配制合理的淬火液。通过测定淬火和回火的硬度和观察金相组织，验证所配制的淬火液是否符合能达到力学性能要求，如不能达到，视情况调整各溶质浓度。 经过多次实验，最后得出结论，所配置的方案六淬火液（水玻璃 412g ,NaCl 1100g,Na2CO3 1100g, NaOH 50g,自来水7500g，配合900℃淬火、560℃回火）是既能保证力学性能要求，又能兼顾节省成本并环保的最佳配方。 关键词 连杆 水基淬火液 水玻璃 力学性能 Title: The Development of 40Cr Connecting Rod with Water-soluble Quenching Liquid Abstract This article is developing a water-based quenching liquid for 40Cr connecting rod forging Quenching. Instead of the quenching oil which is high prices and can’t guarantee the production safety. In this paper, solutes are sodium silicat, NaCl, sodium carbonate and sodium hydroxide. sodium silicate is used to reduce quenching cooling rate, NaCl and sodium carbonate is used to improve quenching cooling rate,and sodium hydroxide acts as keeping the suspension stable sodium. Water to do the solvent. By adjusting the solutes ratio, make up a reasonable quenching liquid. Determination of the hardness of the quenched and tempered, and observation of the microstructure, to verify the preparation of the quenching liquid in line with to achieve the mechanical performance requirements or not. If it can not reach, as the case may adjust the solutes concentration After a series of adjustments, the final experimental verification that We configure the program five quenching liquid (sodium silicate 412g ,NaCl 1100g and Na2CO3 1100g and NaOH 50g, water 7500g, with the 840℃ quenching, 560 ℃ tempering) can guarantee the mechanical performance requirements, while maintaining the cost-saving and environmental protectionthe best formula. Keywords: Connecting rod Water-based quenching liquid Sodium silicate Mechanical properties 目录 第一章 绪论 4 1.1 40Cr连杆 4 1.1.1 40Cr的特性 4 1.1.2 连杆的性能要求 4 1.1.3 40Cr淬火对力学性能的影响 5 1.1.4 锻热淬火 5 1.1.5 锻热淬火后的力学性能 6 1.1.6 40Cr淬火的意义 6 1.2钢的淬火缺陷 7 1.2.1淬火裂纹 7 1.2.2淬火变形 7 1.2.3淬火后硬度不足 7 1.2.4淬火硬度不均匀 7 1.3淬火剂的要求 8 1.3.1 淬火