针对蜗轮、蜗杆材料18Cr2Ni4WA 钢需要具有较高的表面性能,采用直接喷丸强化以及氮化加喷丸强化两种工艺对18Cr2Ni4WA 钢制备的蜗轮及蜗杆试样进行表面强化处理,对比研究了经两种不同工艺处理后试样表面的残余应力以及硬度随层深的分布规律。结果表明:喷丸强化后试样表面的最大残余应力为-484MPa,显微硬度为735HV;氮化加喷丸强化后试样表面的最大残余应力为-1214MPa,硬度为1113HV;两种不同的强化工艺均大幅度提高了材料表面的残余压应力及硬度,且氮化加喷丸强化的复合强化效果更佳。

Shot peening and nitriding-shot peening surface treatments were applied to worm and worm gear samples with material of 18Cr2Ni4WA steel which requires high surface properties. The residual stress distribution and micro-hardness distribution were analyzed after these two different surface treatments. The results show that only with shot peening the maximum surface residual stress was -484 MPa and the maximum hardness was 735 HV, but after nitriding-shot peening the maximum surface residual stress reached -1214 MPa and the maximum hardness reached 1113 HV. Both these two surface treatment methods could greatly improve the residual stress and hardness of the material surface, and the effect of nitriding-shot peening method was better.