关键区别 - 热工作与ColdWorking
热工作和冷工作是冶金中使用的两种重要且常见的方法,用于生产更好的金属产品。这些过程是根据执行这些过程的工作温度命名的。从每种技术获得的最终产品彼此之间或多或少不同。这key difference在热门工作和寒冷的工作之间hot working is done at temperatures aboverecrystallizationtemperature of the metal whereas cold working is done at temperatures below the recrystallization temperature of the metal.
内容
1.Overview and Key Difference
2.What is Hot Working
3.什么是冷工作
4.Similarities Between Hot Working and Cold Working
5。Side by Side Comparison – Hot Working vs Cold Working in Tabular Form
6。概括
What is Hot Working?
热工作是塑性变形a metal above the metal’s recrystallization temperature. Recrystallization temperature is the temperature at which, the deformed grains are replaced by defects-free grains in the metal. Since the hot working is done at temperatures above this recrystallization temperature, it allows the metal to recrystallize while plastically deforming. However, this is done below the熔点金属。
这deformation and the recovery of the metal take place simultaneously. The temperature limits of the hot working process are determined by the metal factors; lower limit is determined by the recrystallization temperature of the metal, and the upper limit is determined by the factors such as undesirable phase transitions, grain growth, etc.
During the hot working process, internal or residual stresses are not built in. Hot working can be used to get a finished product; can get rid of cracks and blow boles. Hence, pores are reduced or completely closed. The hot working process is important in increasing延性of metal. Theyield strengthcan be reduced in this process. This allows working with metal easily.
However, there are some drawbacks as well. Hot working can cause undesirable reactions to occur between the metal and the surrounding atmosphere. The grain structure of the metal can vary from one place to another; not uniform. Specialized equipment is required to maintain the appropriate temperature.
什么是冷工作?
冷工作或工作硬化是在重结晶温度以下的温度下通过塑性变形增强金属的过程。通过金属结构的位错运动获得增强。脱位定义为金属晶体系统中的晶体学缺陷。
这re is no considerable recovery done in the cold working process. However, internal and residual stresses build up in the metal during cold processing. Moreover, cracks or pores in the metal may propagate, and new cracks may form during this cold working process. The strengthening is done without using heat.
冷工作与诸如材料(例如steel,aluminium和copper. When a metal undergoes cold working, permanent defects present in the metal structure change their shape or crystalline makeup. These defects cause the reduction of the movement of the crystals within the metal. Hence, the metal becomes resistant to further deformation. Eventually, the strength and hardness of the metal improve. However, the ductility is not considerably increased from cold working.
有几种类型的冷工作。下面给出了一些示例;
- 挤压 - 这包括滚动,挥舞,挤压和线滚动等技术
- Bending – this includes techniques such as drawing, seaming, flanging and straightening
- 剪切 - 这包括毛坯,衬里,穿孔和拥有等技术
- 绘图 - 这包括电线绘图,旋转,压花和熨烫等技术
热门工作和冷酷的工作之间有什么相似之处?
- 热工作和冷工作过程都涉及金属的塑性变形。
- Both Hot Working and Cold Working are related to the recrystallization temperature of the metal.
What is the Difference Between Hot Working and Cold Working?
热工作与冷工作 |
|
热工作是塑性变形a metal above the metal’s recrystallization temperature. | 冷工作或工作硬化是在重结晶温度以下的温度下通过塑性变形增强金属的过程。 |
温度 | |
热工作是在金属重结晶温度上方的温度下完成的。 | 在金属的重结晶温度以下的温度下进行冷工作。 |
加大压力 | |
在热门工作中,金属中没有内部和残余应力。 | In cold working, internal and residual stresses build up in the metal. |
Recovery of the Product | |
Deformation of the metal and its recovery occurs simultaneously in hot working. | 冷工作中没有大量金属恢复。 |
裂缝 | |
在热工作中可以清除裂缝或毛孔。 | 裂缝propagate, and new cracks are formed in cold working. |
Uniformity | |
热工作后,金属的均匀性非常高。 | 均匀的金属冷加工后很低ing. |
概括–Hot Working vsColdWorking
热工作和冷工作是用于在金属中获得所需特性的冶金过程。热工作和冷工作之间的关键区别在于,在金属的重结晶温度以上的温度下进行热工作,而在金属重结晶温度以下的温度下进行冷工作。
Download the PDF of Hot Working vs Cold Working
You can download the PDF version of this article and use it for offline purposes as per citation note. Please download the PDF version here:热工作和冷工作之间的区别
Reference:
1.贝尔,特伦斯。“冷工作如何增强钢?”余额。Available here
2.“工作硬化。”Wikipedia,Wikimedia基金会,2018年2月10日。Available here
3.“Hot working.” Wikipedia, Wikimedia Foundation, 10 Feb. 2018.Available here
Image Courtesy:
1.'Wiredrawing’(CC BY 2.5)viaCommons Wikimedia
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