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保定市東昊鍛造有限公司

聯系人:黃經理

電話:0312-2200737

手機:13582266002

地址:保定市蓮池區朱莊工業區

行業新聞
影響模鍛件質量的主要因素
1.原材料缺陷
1. raw material defects

如鋼錠或鋼材存在殘余的縮孔、氣泡、疏松、夾雜等,可能導致鍛件開裂。冶金原因引起的鍛造裂紋,其高倍檢驗特征,經常是伴有大量的氧化物、硫化物、硅酸鹽等夾雜。高碳、高合金鋼的原材料,容易存在嚴重的碳化物等第二相偏析,如果鍛造時未能予以擊碎并使其分布均勻,則會降低鍛件的力學性能,熱處理時可能導致鍛件開裂或畸變。原材料表面若存在刮傷、結疤、折疊、發裂都會給鍛件帶來缺陷。因此,在模鍛生產中必須對原材料進行檢驗。
If there are residual shrinkage holes, bubbles, loose and inclusions in ingot or steel, cracking may occur. The high strength inspection characteristics of forging cracks caused by metallurgical reasons are often accompanied by a large number of inclusions of oxides, sulphides and silicates. The raw materials of high carbon and high alloy steel are easy to have serious second phase segregation of carbides. If the forging is not broken and distributed evenly, the mechanical properties of the forgings will be reduced, and the cracking or distortion of the forgings may be caused by heat treatment. Scratching, scarring, folding and cracking will result in defects on the surface of the raw material. Therefore, raw materials must be inspected in die forging.



2.加熱規范
2. heating specification

鍛造大型模鍛件、合金鋼模鍛件時,若加熱速度太快,內外層溫差大,因溫度應力和組織應力將導致中心部分裂紋。
When forging large mould forgings and alloy steel forgings, if the heating speed is too fast and the temperature difference between the inner and outer layers is large, the central part of the crack will be caused by the temperature stress and the tissue stress.

加熱溫度過高、保溫時間較長引起輕微過熱時,將產生有光澤、呈結晶狀、沿晶斷裂的粗晶斷口。輕微過熱的粗大晶粒可以通過退火或正火處理,經過重結晶加以糾正。嚴重過熱時,將產生萘狀斷口或石狀斷口。萘狀斷口的特征是呈現魚鱗狀的亮點,穿晶斷裂;萘狀斷口的產生原因,是粗大的奧氏體晶粒形成晶內織構,穩定性極高,在冷卻過程中轉變為鐵素體時,仍會保留織構的特征。石狀斷口有明顯粗晶,表面無金屬光澤,色灰暗,沿晶斷裂;石狀斷口的產生原因,是過熱溫度下非金屬夾雜溶解度增大,而在冷卻過程中,非金屬夾雜又從過飽和的粗大奧氏體中析出,包圍奧氏體晶粒形成脆性晶殼。過熱嚴重的鍛坯,其力學性能極差。萘狀斷口可以通過高溫正火,消除晶內織構,而石狀斷口難以用熱處理方法糾正,模鍛件成形后,一旦發現石狀斷口就無可挽救。
When the heating temperature is too high and the holding time is longer, it will produce a coarse, crystalline fracture which is crystalline and intergranular. Slightly overheated coarse grains can be corrected by recrystallization or annealing or normalizing. When severe overheating occurs, a naphthalene fracture or a stone fracture will occur. The characteristics of naphthalene like fracture are the bright spot of fish and transgranular fracture, and the cause of the formation of the naphthalene fracture is that the coarse austenite grains form the intragranular texture, and the stability is very high. When the ferrite is converted to ferrite during the cooling process, the texture is still retained. The stone shaped fracture has obvious coarse grain, the surface has no metallic luster, the color is dark and the intergranular fracture. The cause of the stone shaped fracture is the increase of the solubility of the nonmetallic inclusion under the superheated temperature. In the cooling process, the nonmetallic inclusions are precipitated from the oversaturated coarse austenite and encircled the ordral grain to form brittle crystalline shell. The mechanical properties of the overheated forged blank are extremely poor. The naphthalene like fracture can eliminate the intragranular texture through high temperature normalizing, and the stone shaped fracture is difficult to be corrected by heat treatment. After the die forging is formed, it can not be saved once the stone shaped fracture is found.
  1. 聯系人:黃經理
  2. 電話:0312-2200737
  3. 手機:13582266002
  4. 網址:www.vdln.icu
  5. 地址:保定市蓮池區朱莊工業區

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