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巴中灰鑄鐵件鋼的顯微組織評定

信息編號:63925509 發(fā)布時間:2025/8/11 10:46:39
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灰鑄鐵的顯微組織灰鑄鐵的力學性能決定于其基體組織和片狀石墨的分布狀況。灰鑄鐵的力學性能主要取決于其基體組織,為了得到高強度,希望基體組織以珠光體為主、盡量減少鐵素體含量。如果鐵素體量過多,不僅導致鑄鐵的強度低,而且加工時會使刀具過熱,顯著降低刀具的壽命。與球墨鑄鐵不同,對灰鑄鐵不可能有延性和韌性的要求,只要求其強度,所以一般都以珠光體含量高為好。灰鑄鐵中的石墨片,有切割金屬基體、破壞其連續(xù)性、使其強度降低的作用。從強度考慮,應避免產(chǎn)生長而薄的石墨片和粗大的石墨片,具明顯方向性的石墨片影響尤大。控制石墨片的分布狀況,是保證灰鑄鐵性能的關鍵。
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