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Cr12MoV模具鋼硬度
Cr12MoV模具鋼硬度，Cr12MoV 分級淬火工藝(1536236918)
850度預熱-1050度加熱-620度分級，時間一般為2-3分鐘-油冷卻至200度左右-(或260度貝氏體等溫)-520回火2-3次，每次2小時。
硬度在56—61HRC左右。
Cr12Mov熱處理 HRC60 解決裂紋的方法：
分析流程：
1 材料成份 原材料組織 3工件流程
4熱處理工藝 5開裂照片 6工件尺寸
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不能說硬度60HRC必須開裂。開裂的原因有很多，可以參考耿工的說明逐一檢查。開裂的原因有很多，可以參考耿工的說明逐一檢查。淬火后直接開裂可能有以下原因:
1)材料加熱過程不合適。
2)冷卻不當，在Ms溫度低于快速冷卻，應力過大。
3)工件截面尺寸差異過大，或孔洞較多，或應力集中。
4)淬火加熱溫度過高，晶粒粗大，脆性大。過熱時晶界氧化或熔化。
5)工件未預熱，加熱速度過大導致加熱開裂。
6)原組織不良、網狀共晶碳化物或球化退火不良，或原料微裂紋，淬火時裂紋膨脹開裂。
7)重復淬火前未進行中間退火。
8)淬火后未及時回火。
用260-280貝氏體等溫淬火1050，模具的韌性會大大提高，不會開裂。