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为了解抛丸处理对ADC12铝合金表面硬度及粗糙度的影响,对ADC12铝合金挤压铸造件进行不同工艺的抛丸处理,测试抛丸前和抛丸后工件的表面粗糙度及硬度,并对表面形貌进行观察分析。粗糙度和硬度测试结果表明,ADC12挤压铸造件抛丸后的粗糙度Ra为2.850~6.515μm,其硬度(HV)由100提高至107~163,并且不同工艺对硬度及粗糙度的影响具有一定的规律性。经抛丸后的试件相当于对表面进行了微锻造,钢丸反复冲击破坏表层原来晶粒组织,使表层组织翻滚产生了大量位错形成表层加工硬化,使试件表面硬度提高,但抛丸处理中产生的缺陷会使表面硬度降低。抛丸速度升高或抛丸时间加长均使试件表面强化层厚度增加,并随着缺陷产生更有利于产生更大的表面起伏,从而使试件粗糙度增大。
In order to understand the impact of shot peening on the surface hardness and roughness of ADC12 aluminum alloy, the shot peening of ADC12 aluminum alloy extrusion casting was carried out in different processes to test the surface roughness and hardness of the workpiece before and after shot blasting The surface morphology was observed and analyzed. Roughness and hardness test results show that the roughness Ra of ADC12 extrusion castings after shot blasting is 2.850 ~ 6.515μm, the hardness (HV) increases from 100 to 107 ~ 163, and the impact of different processes on hardness and roughness has A certain regularity. After blasting the specimen is equivalent to a micro-forging on the surface, the repeated impact of steel balls destroy the original grain structure of the surface, so that the surface tissue rolling a large number of dislocations formed surface hardening, the specimen surface hardness, but throwing Defects in pellet handling can result in reduced surface hardness. The increase of shot blasting speed or shot duration prolong the thickness of the surface strengthened layer and increase the roughness of the specimen as the defect is generated.