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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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喷射成形含铌M3型高速钢组织与性能研究
DOI: 10.11900/0412.1961.2014.00216, PP. 1421-1428
Keywords: 喷射成形,M3型高速钢,Nb,显微组织
Abstract:
采用喷射成形快速凝固技术制备了M3型高速钢和以Nb代V的M3型高速钢.利用SEM(EDS),XRD,OM,TEM,HRTEM研究了Nb对M3型高速钢组织的影响和其组织演变.结果表明,喷射成形消除了宏观偏析,细化了组织,以Nb代V,可在共晶反应前析出MC型碳化物,使其球形化、均匀分布,由于消耗大量C,共晶M2C碳化物数量减少,促使更多W和Mo固溶进基体.均匀分布的高热稳定性含Nb-MC型碳化物能阻碍奥氏体化过程中晶粒长大,但难以固溶,使得回火过程中主要析出与基体共格的M2C型碳化物.喷射成形含Nb钢硬度和弯曲强度高于ASP23钢,大量硬质MC碳化物易于产生应力集中,使其韧性稍低于ASP23.
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