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本帖最后由 wangqinghua196 于 2011-9-5 22:51 编辑
[原创] 一项震惊的发明,钢铁“闪处理”技术
有必要说说此贴了。这个主题是议论的《Development of rapid heating and cooling (flash processing) process to produce advanced high strength steel microstructures》译为:《生产高强度钢的快速加热与冷却(瞬时处理)工艺的发展》,也就是说:flash processing就是“瞬时处理”之意,从热处理角度说,原文中根本没有“闪”的意思。
摘抄部分描述如下:
生产高强度钢的快速加热与冷却(瞬时处理)工艺的发展
Development of rapid heating and cooling (flash processing) process to produce advanced high strength steel microstructures
Flash processing of an AISI8620(注:铬镍钼合金结构钢) steel sheet, which involves rapid heating and cooling with an overall process duration of<10s, produced a steel microstructure with a high tensile strength and good ductility similar to that of advanced high strength steels. Flash processed steel [ultimate tensile strength (UTS):1694MPa, elongation: 7.1%], showed at least 7% higher UTS and 30% greater elongation than published results on martensitic advanced high strength steel (UTS: 1585 MPa, elongation: 5.1%). The underlying microstructure was characterised with optical, scanning electron, transmission electron microscopy as well as hardness mapping. A complex distribution of bainitic and martensite microstructures with carbides was observed. A mechanism for the above microstructure evolution is proposed.
Experimental
Steel composition and initial condition
In earlier work, Cola has investigated many steels including AISI8620 steels by FP10。In the current paper, to limit the effect of the steel compositions on the interpretations of the microstructure and property correlations, only AISI8620 grade steel sheets were investigated. The measured composition of the steel is Fe–0.21C–0.27Si–0.002S–0.009P–0.73Mn–0.48Cr–0.48Ni–0.007Co–0.156Mo–0.178Cu (wt-%). The original steel was under the annealed condition and the microstructure constitution was ferrite and uniform dispersion of carbides.
Flash processing set-up and heat treatments
Fig.1 Schematic illustration of experimental set-up of FP technique
A schematic of the process set-up is shown in Fig. 1. The assembly consists of a pair of rollers that transfers the steel sheets through a heating and cooling stage. At a controlled distance from the top pair of rollers, the heating stage is placed. The heating stage is based on either oxy propane flame or electrical induction heating. The flame heating consists of 17 flame nozzles spaced evenly to spread the heat over the steel sheets. The above set-up has also been equipped with infrared pyrometers, instrumentation to drive the feed rollers, mechanical fixtures for positioning heating and cooling units, and heating intensity controls. Spot temperature check using an Ircon (美国IRCON公司的IRCON公司品牌)infrared pyrometer(红外线高温计) showed a small variation of temperature of approximately ±10℃ from the middle to the edges of the sample. Immediately below the heating port, a cooling trough is placed. To avoid inefficient heating due to the upward flow of steam, a graphite separator film is used to separate the heating and cooling ports. In this experiment, the steel sheets were fed through the heating and cooling system at a rate of 28 cm min21 while maintaining the peak temperature at 1100℃. In order to compare the flash processed samples with a reference sample, another AISI8620 unprocessed steel sheet was subjected to a quenched and tempered (QT) treatment (1000℃/2 min→quenched →tempered at 200℃/4 min).
翻译(是否恰当,请语言大师指正):
AISI8620薄钢板瞬时处理,包括快速加热和冷却,整个工艺过程<10s,这个工艺生产出一种高强度和良好的韧性的显微组织的钢,这种钢类似于先进高强度钢。瞬时处理出来的钢[超强度(UTS):1694MPa,延伸率:7.1%],比UTS钢至少高7%,和比公开发表的先进的马氏体高强钢(UTS:1585MPa,延伸率:5.1%)延伸率高出30%。使用光学显微镜、扫描电镜、透射电子显微镜以及硬度映射图描述了基体显微组织。观察到了贝氏体+马氏体+碳化物的复杂分布的显微组织。提出了上述显微组织变化的机制。
试验
钢的成分及初始条件
早期工作中,Cola采用FP已经研究了很多钢种,包括AISI8620钢。在这篇论文中,仅仅研究AISI8620薄钢板的成分对显微组织与性能之间相互关系的影响,钢的成分是Fe–0.21C–0.27Si–0.002S–0.009P–0.73Mn–0.48Cr–0.48Ni–0.007Co–0.156Mo–0.178Cu (wt-%)。原始钢材是在退火条件下,显微组织状态是铁素体+均匀分布的碳化物。
瞬时处理及热处理
工艺结构简图见图1。这个装备是由传递薄钢板通过加热和冷却阶段的一对辊子组成。从顶部的一对辊子,加热阶段之间留出一个可控的距离。加热阶段是根据氯丙烷火焰或感应加热确定。氯丙烷火焰加热有17个火焰喷嘴间距,均匀喷射到薄钢板上。上面的装置安装红外线高温计,装置驱动喂料辊子。机械固定加热和冷却部件单元,和控制加热烈度。现场温度检测使用一个IRCON红外线高温计,从样品的边缘到中心的最小温度波动在±10℃。
在加热段下面,接着布置一个冷却槽。为了避免蒸汽向上流动影响加热,用石墨隔离幕来隔开加热和冷却区域。
在这个试验中,加热峰峰值在1100℃时,薄钢板走速是28cm/min通过加热和冷却系统。为了用瞬时处理的样品与参照样品比较,另一个没有经过处理的AISI8620薄钢板采用淬火+回火(QT)处理(1000℃/2min→淬火→200℃/4min回火)。
从上面完整的热处理试验过程及内容描述看就是正常的热处理过程,没有那么玄乎(“闪”的意思)的东西。提请各位再看看我们(我国)热处理前辈对这个问题的认识,我用附件附在之后。可以看到这个工艺在我国讨论之早。所以张召忠将军说:现在的汉奸比解放前日伪时期多多了。
我看了这个帖子很久了,此帖纯粹在糊弄人,其内容就是一般的热处理工艺方法。应该叫做“瞬时处理”的热处理工艺,不叫“闪处理”。瞬时处理工艺=迅速加热和冷却的工艺。这是《严重误导人们的几个热处理问题》中的“名词术语的乱造”一类情况。语言刻薄,敬请谅解。建议“了解未来,先了解过去;了解国外,先熟悉国内;了解他人,先丰富自己”。 |
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