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P20钢预硬化热处理工艺的研究 总被引:1,自引:0,他引:1
采用淬火和回火实验研究了塑料模具钢P20预硬化热处理工艺,提出了预硬化硬度的两种计算方法-回火方程计算法和回火参数图解法.结果表明:回火温度和时间是影响预硬化处理P20钢硬度的主要因素.淬火温度的影响较小.P20钢最佳预硬化热处理工艺为860℃×2h淬火+660℃×(0.5~10)h回火. 相似文献
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P20BSCa大截面塑料模具钢淬透性的研究 总被引:2,自引:0,他引:2
用模拟试验的方法研究了用于大截面塑料模具的P20BSCa预硬易切削塑料模具钢的淬透性。结果表明,该钢具有优异的淬透性,经淬火及回火处理后,截面尺寸为600mm的模块心部硬度可达33HRC以上。可以满足预硬硬度为30~35HRC的大型塑料模具的使用要求。 相似文献
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研究了 3Cr2 Mo塑料模具钢预硬化热处理工艺参数 (淬火温度、回火温度、回火时间 )对钢的硬度和冲击韧度的影响 ,得出了使该钢达到最佳预硬化效果的工艺参数。 相似文献
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利用扫描电镜、金相显微镜、洛氏硬度计研究了P20塑料模具钢淬火及回火组织,并测定了硬度随淬火温度以及回火温度的变化.P20钢经830~920℃淬火得到板条马氏体.淬火后晶粒尺寸随淬火温度的升高有粗化的趋势但并不明显,直到890℃以后才明显粗化,因此,淬火温度应在830~890℃,以860℃为宜.P20钢硬度随回火温度升高而降低,碳化物析出增多并逐渐球化,马氏体板条边界逐渐变得模糊,有些板条合并变宽.P20钢经620℃×1 h回火后其硬度为32.8~35.8HRC,能满足预硬化硬度要求,而且经830~890℃淬火+620℃×1 h回火,硬度基本不随淬火温度变化,这将有利于工厂组织生产,因此最终选择预硬化工艺为860℃×30min淬火+620℃×1 h回火. 相似文献
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塑料模具钢的正确使用是提高塑料模具质量的关键。预硬化型塑料模具钢SM3Cr2Mo在预硬态(硬度一般为28~35HRC)使用,不需再进行淬火、回火处理,防止了热处理所造成的变形、开裂、脱碳等缺陷,适宜制造形状复杂、大中型、精密的热塑性塑料制品成型模具。 相似文献
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浅析我国模具钢的发展空间 总被引:2,自引:0,他引:2
与发达国家相比,我国模具钢领域的不足之处在于:思想意识落后,无专用技术标准,制造工艺粗糙,使用效果不佳,销售方式陈旧,销售价格过低。近年来,我国在热作模具钢和塑料模具钢方面已有所突破,经超细化处理的SWPH13钢的性能和使用效果达到了国际一流水平,大规格预硬型P20和718钢模块硬度均匀,领先开发了非调质塑料模具钢,同时明确了模具钢的发展方向为高纯度、高均匀性、大型化和长寿命。 相似文献
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预硬型塑料模具钢的研究进展 总被引:6,自引:1,他引:5
综述了预硬型塑料模具钢的分类、性能要求和国内外预硬型塑料模具钢的牌号和化学成分,重点介绍了近年来国内预硬型塑料模具钢在成分设计和热处理工艺改进方面取得的研究成果,其中一些钢的性能和预硬化工艺达到国际先进水平,指出了预硬型塑料模具钢今后的发展方向. 相似文献
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AbstractQuenching–partitioning–tempering (Q–P–T) steels have become a new member of the family of advanced high strength steels. Previous research indicates that steels treated by the Q–P–T process exhibit better combinations of strength and elongation than those treated by traditional quenching and tempering (Q&T); this has been attributed to the lower quenching stress and larger amount of retained austenite in the Q–P–T steels. In the present paper, the concept of water–air alternately timed quenching (ATQ) technology, in effect a multi-cycle Q–P–T (MQ–P–T) process, is presented. The principles of ATQ technology and related equipment are introduced. Examples given of workpieces treated by ATQ technology include a 718 steel plastic die, a 42CrMo4 marine crankshaft and a wind-electric spindle. Unlike single-stage water quenching, oil quenching or quenching in aqueous polymer solution, ATQ avoids cracking of large workpieces during heat treatment and can produce high levels of mechanical properties. This novel process has proved beneficial in economy and environmental protection during more than 10 years practice in China. Finally, a study is presented of hot-rolled steel plate treated by the Q–P–T process using quenching equipment that travels under water. On the basis of this study it is suggested that the MQ–P–T process is suitable for application on hot-rolled steel plates of various thicknesses. 相似文献
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通过成分优化设计,提高实验钢空冷及风冷时的淬透性能,并以ANSYS数值模拟计算出的厚度为500~1000 mm不等的大模块非调质生产时的冷却速度范围为验证条件,验证实验钢的空冷及风冷贝氏体淬透性。结果表明:实验用贝氏体非调质预硬型塑料模具钢达到所需的淬透性能要求,在0.01~0.1℃/s冷速范围内,即大于1000 mm厚度模块模拟冷速范围,依然获得组织均匀的贝氏体,且硬度范围在393~434 HV之间,满足硬度波动在±2 HRC以内的硬度均匀性条件,可应用于厚度在800~1000 mm大模块预硬型塑料模具钢的非调质试生产中。 相似文献
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Yi Luo Xiao-chun WuHong-bin Wang Yong-an Min 《Journal of Materials Processing Technology》2009,209(14):5437-5442
The non-quenched prehardened (NQP) steel and quenched and tempered prehardened (QP) steel for plastic mould were compared in terms of their microstructures, machinability, hardness and weldability along with their continuous cooling transformation. Results show that the microstructure of the NQP steel bloom consists of bainite through the whole section, while tempered martensite and bainite are found across the whole section of the QP steel. However, hardness fluctuations of two types of steel are not more than 3 HRC, for the former contributed to the high bainitic hardenability, while, for the latter, microstructures were adjusted by heat treatment after forging. Compared with the QP steel, the NQP steel results in better machinability, weldability and requires a simplified process that saves energy. 相似文献
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P20SRE塑料模具钢的热处理及性能 总被引:2,自引:2,他引:2
研究了P20SRE易切削塑料模具钢的热处理工艺、组织与性能。试验结果表明,该钢的热处理工艺简单,切削性能优于P20及P20S钢,在预硬至35HRC状态下,能进行各种机加工。 相似文献
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