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碳鋼鍛件的過熱現(xiàn)象有哪些 Carbon steel forgings overheating phenomenon which

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2021-06-25 00:00

來源：

　　碳鋼鍛件鍛造加工前毛坯需要經(jīng)過加工，那么在加熱過程中過熱現(xiàn)象是指碳鋼鍛件所使用的金屬坯料的加熱溫度過高，在規(guī)定的鍛造與熱處理溫度范圍內停留時間太長，或由于熱效應使溫升過高而引起的晶粒粗大現(xiàn)象。
　
　　碳鋼鍛件過熱之后會出現(xiàn)魏氏組織。馬氏體鋼過熱之后，往往出現(xiàn)晶內織構，工模具鋼往往以一次碳化物角狀化為特征判定過熱組織。鈦合金過熱后，出現(xiàn)明顯的β相晶界和平直細長的魏氏組織。合金鋼過熱后的斷口會出現(xiàn)石狀斷口或條狀斷口。過熱組織，由于晶粒粗大，將引起力學性能降低，尤其是沖擊韌度。
　
　　一般鍛件廠對過熱的碳鋼鍛件經(jīng)過正常熱處理（正火、淬火）之后，組織可以改善，性能也隨之恢復，這種過熱常被稱之為不穩(wěn)定過熱；而合金結構鋼鍛件的嚴重過熱經(jīng)一般的正火（包括高溫正火）、退火或淬火處理后，過熱組織不能完全消除，這種過熱常被稱之為穩(wěn)定過熱。
　
　　Carbon steel forgings forging before processing blanks need to be processed, then the process of heating in the process of overheating refers to the carbon steel forging the use of metal blanks heating temperature is too high, in the specified forging and heat treatment temperature range of residence time is too long, or due to Thermal effect caused by the temperature rise is too high caused by the phenomenon of coarse grain.
　
　　Carbon steel forgings after the overheating will appear Wei's organization. Martensitic steel after the overheating, often appear within the fabric texture, die and die steel is often a carbide angle characteristics to determine the superheat organization. Titanium alloy overheating, there is a clear β-phase grain boundary and straight and elongated Wei's organization. Alloy steel overheating after the fracture will appear stone fracture or strip fracture. Overheated tissue, due to coarse grain, will cause mechanical properties to reduce, especially the impact toughness.
　
　　The general forging plant on the overheated carbon steel forgings after normal heat treatment (normalizing, quenching), the organization can improve the performance also will be restored, this overheating is often referred to as unstable overheating; and alloy structural steel forgings serious overheating After the normal normalizing (including high temperature normalizing), annealing or quenching, the superheat tissue can not be completely eliminated, this overheating is often referred to as stable overheating.
 

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