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我厂生产中使用的5CrMnMo钢冷挤冲(见图),要求热处理后硬度为HRC48～52。原采用840℃×45min油淬、380℃×3h回火工艺处理,处理后硬度符合技术要求,但使用寿命却很低。为了提高冷挤冲的使用寿命,我们对其失效形式进行了统计和分析:按原热处理工艺处理的冷挤冲,硬度为HRC>53的大多数是开裂失效,硬度为HRC<49的大多数是镦粗失效;而硬度在HRC50～52之间的,其失效形式既有开裂的,也有镦粗的,性能不甚稳定,一般寿命只有200～300次。我们认为,硬度为HRC>53的,强度过高,带来脆性不利因素;硬度为HRC<49的
I used in the production plant 5CrMnMo cold extrusion squeeze (see Figure), requiring heat treatment after the hardness of HRC48 ~ 52. The original 840 ℃ × 45min oil quenching, 380 ℃ × 3h tempering process, the hardness after treatment meet the technical requirements, but the service life is very low. In order to improve the service life of cold extrusion, we have carried on the statistics and the analysis to its failure form: According to the cold crushing that the original heat treatment process dealt with, most of the hardness HRC> 53 is cracking failure, the hardness is most HRC <49 Is upsetting failure; and hardness of HRC50 ~ 52 between the failure of both forms of cracking, but also upsetting, performance is not stable, the general life expectancy is only 200 to 300 times. We believe that the hardness of HRC> 53, the intensity is too high, bringing brittle adverse factors; hardness of HRC <49