聚合物淬火介质SST102在轴承钢热处理中的应用

研究了轴承钢GCr15在淬火介质SST102中淬火后的淬透性,变形开裂性。结果表明,适当调整SST102的浓度,可获得不同的冷却速度,适合轴承钢GCr15淬火介质的最佳浓度为1.5%～2.0%。     

淬火介质SST102在调质钢热处理中的应用

研究了调质钢40Cr在淬火介质SST102中淬火后的淬透性,变形开裂性及力学性能。实验结果表明,适当调整SST102的浓度,可以获得不同的冷却速度,作为调质钢40Cr淬火介质的最佳浓度为1.0％～1.5％．     

聚合物淬火剂的冷却机制及在热处理中的应用

对淬火剂SST101在其不同浓度下冷却曲线及40CrMn钢在该介质中淬火后的淬透性，变形开裂性及力学性能进行了测定，并探讨了其冷却机制，所得结果对淬火剂SST101的应用，具有重要的指导意义。     

新型淬火剂SST201冷却特性研究

本文简述了淬火剂SST201的基本特性,并对其冷却特性进行了探讨。结果表明:SST201的冷却能力随其浓度增大,温度升高,重复使用次数增多而降低,并揭示了该介质在冷却金属时能在金属表面形成一层聚合物隔离膜,此膜能避免因零件的几何形态的差异造成的冷却不均匀现象,有效地防止开裂与变形。     

影响淬火剂SST201冷却特性因素的研究

对淬火剂SST201在不同浓度、温度及重复使用次数下的冷却曲线进行测定。试验结果表明，浓度、温度、重复使用次数时其冷却特性均有影响；随浓度增大、温度升高、重复使用次数增多，其冷却能力降低。     

低铬半钢热变形后的冷却方式对其组织与力学性能的影响

对低铬半钢经35%热变形后用4种不同冷却方式冷却后的组织与力学性能进行了研究，结果表明，热变形后冷却方式显著影响低铬半钢的力学性能，其中，低铬半钢经SST101淬火液冷却和风冷后的综合力学性能较好。     

������SST103�ڵ��ʸּ���и��ȴ����е�Ӧ��

 研究了40Cr调质钢和GCr15轴承钢在淬火介质SST103中淬火后的淬透性、变形与开裂性以及40Cr钢的力学性能。实验结果表明：适当调整SST103介质的浓度,可以获得不同的冷却速度。适合40Cr调质钢及GCr15轴承钢的淬火剂的最佳浓度分别为1.0%~1.5%和1.5%~2.0%。     

斜轧低铬白口铸铁磨球工艺试验

研究了斜轧低铬白口铸铁磨球的制坯方法,轧制工艺及轧后余热热处理工艺。结果表明,最佳的制球工艺为,将经过一次小量预变形的金属型棒料,在1000～1050℃于较松的孔型中轧制成球,轧后在SST101介质中冷却,200～350℃回火。     

聚合物淬火介质SST301对斜轧半钢磨球硬度及开裂性的影响

研究了斜轧半钢磨球在淬火介质SST301中淬火后的硬度，淬裂敏感性，结果表明：适合斜轧半钢磨球淬火介质SST301的浓度应在1．0％－1．5％之间，且温度低于40℃。     

Sn-Sb包晶合金的快速凝固

设计了一种用于Sn-Sb等滑动轴承合金的无容器接触深过冷快速凝固装置.并以热流分析为基础,利用传热模型和物理模型计算了Sn-16%Sb(质量分数)过包晶合金在本装置中的冷却速度.结果表明:在粒子直径为4mm时,粒子的冷却速度为3.1×102K/s;当粒子直径为0.1mm时,冷却速度达到了105K/s.Sn-Sb包晶合金组织显著细化,初生相SnSb化合物高度弥散化.     

淬火剂SST101冷却机制的探讨

本文对淬火剂ＳＳＴ１０１在其不同浓度、温度下冷却曲线及４０Ｃｒ钢在该介 淬火后的淬透性、变形开裂性的测定,探讨了其冷却机制。结果表明,该淬火剂在冷却金属时,在钨表面形成一层聚合物隔离膜,此膜能降低金属淬火时产生的热应力和组织应力,避免了冷却不均现象,减小了工件变形与开裂。     

Akresol: A new polymer quenchant

The cooling capacity of aqueous solutions of polymer compositions based on polycarboxylic acids and copolymers of N-vinyl amides is studied. Tests of a new quenchant based on interpolymer complexes of anion-active components are performed and the process possibilities and the reproducibility of properties of different batches of this quenchant are estimated.     

聚合物水基淬火介质在锻造冷作模具钢上的应用

本文详细介绍了锻造冷作模具钢Cr12、Cr12Mo、Cr12MoV和Cr12Mo1V1的性能、热处理工艺和用途。并指出Cr12MoV钢最适合用于制造轧制焊接钢管模具,具有使用寿命长、性价比高的优点。重点论述了金润宝ZFQ-A型和ZFQ-BI类油聚合物水基淬火介质和ZFQ-BIIPAG聚合物水基淬火介质的冷却特性,三种水溶性淬火介质的最大冷却速度为15~151℃/s,300℃冷却速度为6.4~47.4℃/s。基本上满足各种高碳高铬铸铁(以Cr26为代表、中碳中合金钢和高碳高合金钢零件淬火工艺)的需要。其中15%浓度ZFQ-BI型类油聚合物水基淬火介质,成功地代替了淬火油,用于Cr12MoV焊接钢管轧辊的淬火。BI型类油聚合物15%水溶液与普通淬火油的冷却特性十分接近,最大冷却速度分别为64.2℃/s和83.5℃/s,300℃冷却速度分别为5.9℃/s和6.5℃/s。在马氏体转变阶段,产生的应力非常小,工件不发生开裂。     

冷却过程的动态特性与钢的实际淬火冷却

采用带中心电偶的钢探头在淬冷过程中产生的电势信号和信号处理技术获得了冷却过程的瞬时动态曲线。研究了不同尺寸探头和在不同淬火介质中的动态曲线,并与TTT和CCT曲线作了比较。结果表明,钢在具有物态变化的介质中淬火时,冷却速度剧烈波动主要出现在钢被浸入淬火剂的初始阶段,探头尺寸越小,冷却介质的冷却能力越强,冷却过程越不稳定;此外,冷却三阶段在动态曲线上没有明确的分界。在实际淬火操作中,宜选用特性点较高的淬火剂,以利于工件在动态特性变化大的范围内进行自适应调整。而在过冷奥氏体转变的快冷阶段,宜保持匀速冷却,以减少动态波动的干扰。动态波动程度低而又无物态变化的单一阶段冷却最有利于过程控制和减小工件畸变。     

Influence of Steel Grade on Surface Cooling Rates and Heat Flux during Quenching

Immersion quenching is one of the most widely used processes for achieving martensitic and bainitic steels. The efficiency and quality of quenching are generally tested using standard quench probes for obtaining the cooling curves. A host of parameters like quenchant type, steel grade, bath agitation, section thickness, etc., affect the cooling curves. Cooling curve analyses covered under ASTM standards cannot be used to assess the performance of a quenchant for different grades of steel, as they use a common material for the probe. This article reports the development of equipment, which, in conjunction with mathematical models, can be used for obtaining cooling curves for a specific steel/quenchant combination. The mathematical models couple nonlinear transient inverse heat transfer with phase transformation, resulting in cooling curves specific to the steel grade-quenchant combination. The austenite decomposition models were based on an approach consistent with both the TTT diagram of the steel and Fe-C equilibrium phase diagrams. The TTT diagrams for the specific chemistry of the specimens and the thermophysical properties of the individual phases as functions of temperature were obtained using JMatPro software. Experiments were conducted in the laboratory for computing surface temperature and heat flux at the mid-section of a 25-mm diameter by 100-mm-long cylindrical specimen of two types of steels in two different quenchants. A low alloy steel (EN19) and a plain carbon steel (C45) were used for bringing out the influence of austenite transformation on surface cooling rates and heat flux. Two types of industrial quenchants (i) a mineral oil, and (ii) an aqueous solution of polymer were used. The results showed that the cooling curves, cooling rate curves, and the surface heat flux depended on the steel grade with the quenchant remaining the same.     

聚合物淬火剂的细菌问题分析及对策

聚合物淬火剂由于其显著的优点应用日益广泛。但使用中往往会滋生细菌,不仅加速了聚合物淬火剂的老化,而且有加速工件生锈、影响环境卫生等弊病。聚合物淬火剂中细菌的滋生与所用聚合物和水的质量,淬火系统的循环状况,pH值,杂屑杂油以及空气中的细菌等因素有关。使用好富顿生物稳定的产品AquaQuench245是一个解决细菌滋生的最佳方案。     

油污掺杂对PAG水基淬火液冷却特性的影响

为了探究油污对水基型淬火液冷却性能的影响,测试了不同油浓度下淬火液的冷却速率曲线、硬化能力等,通过分析淬火的具体过程和特性值函数,探讨了油污的掺杂影响淬火液冷却性能的机制。结果表明:当淬火液中油污含量大于0.3%时,淬火液的冷却性能明显变差,具体表现为沸腾阶段延后且高温阶段冷却速率明显下降,淬火液的硬化能力也随之降低;但油污的含量对工件的畸变影响较小。     

Effect of thermal conductivity and viscosity on cooling performance of liquid quench media

Abstract

In this present work, the effect of the thermophysical properties of quenchants on its cooling performance was investigated. Water, brine solutions, polymer solutions and mineral oils were chosen to have quench media with varying thermophysical properties. Cooling curve analyses were carried out by using standard ISO/DIS 9950 quench probe. Grossmann H quench severity of the quench media was determined from the relation of H and cooling rate. Cooling curve analysis results showed that the change in thermophysical properties of the quench media had significant effect on the cooling history of the quench probe. The viscosity of the quenchant used for immersion quenching is the most important factor that controls the cooling performance of the quenchant compared to thermal conductivity of the quench medium.