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针对某企业中30×180系列齿辊破碎机中破碎辊表面出现金属剥落的现象,通过成分分析、断口形貌分析、金相分析、硬度测试等方法对破碎辊表面失效原因进行分析。分析得出:热处理过程中破碎辊冷却速度过快,从而引起表面层中魏氏组织的产生,诱发脆性裂纹,使得破碎辊合金层表面产生脆性断裂脱落,最终导致失效。
Aiming at the phenomenon of metal spalling on the surface of the broken roller in a 30 × 180 series gear roller crusher in an enterprise, the cause of failure on the surface of the broken roller is analyzed by means of composition analysis, fracture surface morphology analysis, metallographic analysis and hardness test. The analysis shows that the cooling speed of the crushing roller is too high during the heat treatment, causing the production of Wei’s tissue in the surface layer and inducing the brittle crack, resulting in brittle fracture and shedding on the surface of the crushing roller alloy layer, finally resulting in failure.