铸造技术2016，Vol.37Issue(9)：1842-1844,1857,4.DOI:10.16410/j.issn1000-8365.2016.09.012
热处理对铸造4Cr9Si2耐热钢显微组织和性能的影响
Effect of Heat Treatment on Microstructure and Properties of Cast 4Cr9Si2 Heat Resistant Steel
摘要
Abstract
Effect of heat treatment on the microstructure and mechanical properties of a cast 4Cr9Si2 heat resistant steel was studied.The results show that the as-cast 4Cr9Si2 steel possesses typical lath martensitic microstructure.After annealing treatment at 860 ℃ for 2 h,coarse M23C6 carbide with particular and stripy shapes precipitate in the ferrite matrix,and the hardness of the steel decreases obviously but its impact absorbed energy is very low.When the as-cast steel is normalized at 1 020 ℃ for 1 h followed by air cooling then tempered at 720 ℃ for 2 h,the cooling rate after the tempering treatment has much influence on the microstructure and impact absorbed energy of the steel.In contrast to the water cooling,the tempering treatment followed by furnace cooling causes high temperature tempering embrittlement,and a lower impact absorbed energy and a higher hardness because the fine dispersive carbide particles are densely distributed in the matrix and secondary hardening is obtained in the furnace-cooling condition.关键词
铸造耐热钢/热处理/冲击性能/回火脆性Key words
cast heat resistant steel/heat treatment/impact property/tempering embrittlement分类
金属材料引用本文复制引用
刘显昌,周丽,薛冰,殷凤仕..热处理对铸造4Cr9Si2耐热钢显微组织和性能的影响[J].铸造技术,2016,37(9):1842-1844,1857,4.基金项目
山东省自然科学基金(ZR2013EMM005) （ZR2013EMM005）
