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Cr12MoV模具钢硬度
Cr12MoV模具钢硬度，Cr12MoV 分级淬火工艺(1536236918)
850度预热-1050度加热-620度分级，时间一般为2-3分钟-油冷却至200度左右-(或260度贝氏体等温)-520回火2-3次，每次2小时。
硬度在56—61HRC左右。
Cr12Mov热处理 HRC60 解决裂纹的方法：
分析流程：
1 材料成份 原材料组织 3工件流程
4热处理工艺 5开裂照片 6工件尺寸
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不能说硬度60HRC必须开裂。开裂的原因有很多，可以参考耿工的说明逐一检查。开裂的原因有很多，可以参考耿工的说明逐一检查。淬火后直接开裂可能有以下原因:
1)材料加热过程不合适。
2)冷却不当，在Ms温度低于快速冷却，应力过大。
3)工件截面尺寸差异过大，或孔洞较多，或应力集中。
4)淬火加热温度过高，晶粒粗大，脆性大。过热时晶界氧化或熔化。
5)工件未预热，加热速度过大导致加热开裂。
6)原组织不良、网状共晶碳化物或球化退火不良，或原料微裂纹，淬火时裂纹膨胀开裂。
7)重复淬火前未进行中间退火。
8)淬火后未及时回火。
用260-280贝氏体等温淬火1050，模具的韧性会大大提高，不会开裂。