History of the development of heat treatment

Release Date：2013-12-23 00:00 Source：http://www.ksyyc.com Click：

Heat treating the metal material is placed within a heating medium , heat , cooling, by changing the microstructure of the surface or internal structure to control the performance of a hot metal process .

  In the course of progress from the Stone Age to the Bronze Age and Iron Age , the heat treatment [ 1 ] role gradually recognized. As early as 770 BC to 222 BC , the Chinese had discovered in the production practice , metallurgy performance due to deformation of the pressure and temperature variations. Softened white cast iron is an important process of manufacturing tools .
  The sixth century BC , steel weapons gradually being adopted , in order to increase the hardness of steel, quenching process then developed rapidly. Yan Yi County , Hebei Province, China have unearthed the next two swords and a halberd , which has a martensitic microstructure exist , instructions are through hardened .
  With the development of hardening technology, people gradually found to affect quench hardening agent on quality . Three Shu Pu Yuan was in this wise Shaanxi Xiegu of 3000 knife fight the system , according to legend was sent to Chengdu water quenching . This shows that in ancient China noticed the cooling capacity of the different water quality , but also pay attention to the cooling capacity of the oil and urine . China 's Western Han Dynasty unearthed (206 BC -AD 24 ) Jing of Zhongshan Mausoleum sword , the center carbon content of 0.15 to 0.4 %, while the surface of the carbon content was more than 0.6% , indicating that it has applied carburizing process . But then as an individual , " craft " secret , refused to rumor , so development is very slow.
In 1863, British scientist and geologist metallurgical steel under a microscope shows six different microstructure proved that the steel in the heating and cooling , internal organizational change occurs , the high temperature phase transition in steel during quenching as a hard phase . Allotrope of iron theory, and iron-carbon phase diagram Frenchman Osmond Austin established the first Englishman developed for modern heat treatment process initially laid a theoretical foundation . At the same time , people also studied during the heating of the metal in the metal heat treatment method of protection , in order to avoid the heating process such as metal oxidation and decarbonization .
1850 ~ 1880 , for the application of various gases ( such as hydrogen gas, carbon monoxide , etc. ) had a series of heated patent protection . 1889 - 1890 British lake access to a variety of metal bright heat treatment of the patent.
  Since the twentieth century , the development of metal physics and other new technologies porting applications to enable greater development of metal heat treatment process . A significant development was the 1901 to 1925 , the industrial production applications drum gas carburizing furnace ; 30 years appeared dew potentiometer, the furnace atmosphere carbon potential to achieve controllable , and later developed an infrared carbon dioxide analyzer , oxygen probe and other methods to further control the furnace atmosphere carbon potential ; 1960s, the use of heat treatment technology , such as the role of the ion field , the development of ion nitriding, carburizing process ; laser, electron beam technology applications, and the metal gained a new surface heat treatment and chemical treatment methods.

Yang Yi Kunshan Shanghai heat treatment of hot flashes treatment , Ltd. is an industry leader , we are close to sincere customer satisfaction customer service to retain customers and win-win to lead the client characteristics , treatment of hot flashes , Ltd. Kunshan Yi Yang warmly welcome you to watch and look forward to your collaboration with Oh!

Previous：China Heat Treatment broad vision of the future direction of development of energy-saving heat treatment
Next：Heat treatment process