CAJ | 학술논문

针对环锤在使用过程中易出现裂纹、断裂、耐磨性差及使用寿命短的缺点,通过成分优化、新型铁砂造型-螺旋环冷铁的消失模铸造工艺及沉淀强化热处理工艺设计,成功开发一种以普通高锰钢为基础添加合金元素,经复合变质处理后,初始硬度达210 HB,冲击韧度在215 J·cm~(-2)以上的高耐磨钢.研究结果表明,该钢经多元微合金化、复合变质处理后,奥氏体基内形成弥散分布的合金碳化物等第二硬质相颗粒,强化了基体,提高了材料的初始硬度.当采用铁砂造型时,铁砂既体现型砂的固有特性又充当金属型的作用,使铸件的晶粒得到细化,组织致密度得到提高.生产实践证明:按此工艺生产的环锤件,经1 080 ℃保温4 h水淬+320 ℃保温3 h回火的沉淀强化处理,抗拉强度σ_b=724 MPa,冲击韧度α_k=219 J·cm~(-2),断后伸长率δ=37%,布氏硬度210 HB,可满足产品使用性能要求,在实际使用中获得良好的耐磨效果,具有明显的市场竞争优势.
침대배추재사용과정중역출현렬문、단렬、내마성차급사용수명단적결점,통과성분우화、신형철사조형-라선배랭철적소실모주조공예급침정강화열처리공예설계,성공개발일충이보통고맹강위기출첨가합금원소,경복합변질처리후,초시경도체210 HB,충격인도재215 J·cm~(-2)이상적고내마강.연구결과표명,해강경다원미합금화、복합변질처리후,오씨체기내형성미산분포적합금탄화물등제이경질상과립,강화료기체,제고료재료적초시경도.당채용철사조형시,철사기체현형사적고유특성우충당금속형적작용,사주건적정립득도세화,조직치밀도득도제고.생산실천증명:안차공예생산적배추건,경1 080 ℃보온4 h수쉬+320 ℃보온3 h회화적침정강화처리,항랍강도σ_b=724 MPa,충격인도α_k=219 J·cm~(-2),단후신장솔δ=37%,포씨경도210 HB,가만족산품사용성능요구,재실제사용중획득량호적내마효과,구유명현적시장경쟁우세.
In view of the weakness of ring-hammer such as cracks, breakages, poor wear resistance and short service lifet, a high wear-resistant steel with initial hardness up to HB 210 and impact ductility above 215 J·cm~(-2) is developed successfully, which is based on the high manganese steel with the addition of alloy agents and composite modification, by designing component, designing processes which include a new lost foam casting process of iron-sand molding & spiral-ring chill and a heat treatment for precipitation strengthening. The results show that after multi-element microalloying and composite modification, second hard phase particles such as alloy carbides are formed and dispersively distributed in the austenitic matrix, thereby strengthening the matrix and improving the initial hardness of material. When iron sand is adopted for molding, it not only has the inherent characteristic of molding sand but also plays the function of metal mold, so that the grains of casting are refined , and the microstructure density is improved. The production practice shows that the properties of the ring-hammer produced on the basis of such technique can be obtained as follows: tensile strength σ_b=724 MPa, impact toughness α_k=219 J·cm~(-2), percentage elongation δ=37%, Brinell hardness 210 HB respectively after precipitation strengthening treatment by water quenching at 1 080 ℃ for 4 h and tempering at 320 ℃ for 3 h, which can meet the application requirements, the products have good wear-resistant property in practical application and obvious market competitive advantage.