摘要
通过研究工程机械用低合金高强钢直接淬火和回火过程中组织性能的演变规律,为离线调质高强钢的在线生产提供试验基础。试验钢在轧后空冷条件下得到粗大的粒状贝氏体组织,冲击韧性下降。快冷至210℃以下时得到全部的板条马氏体组织。试验钢具有较强的抗回火软化能力,高温回火后仍具有较高的强度。直接淬火回火条件下钢的综合力学性能均优于离线淬火工艺,体现出超快冷条件下在线热处理技术在发展减量化高性能钢中的优势。
The microstructure and properties evolution behavior in direct quenching and tempering process of a low-alloy high - strength steel for engineering machinery was studied to provide experimental basis for online production of offline quenched and tempered high - strength steel. Coarse granular bainite structure was obtained under air cooling after rolling and the impact toughness was lowered. All the microstructure obtained was lath martensite when it was fast cooled to below 210 ℃. The experimental steel exhibited good temper resistance, and the strength was still high enough after high temperature tempering. The comprehen- sive mechanical properties of the steel under direct quenching and tempering were better than those under offline quenching process. The result shows the advantage of online heat treatment technology under ultra fast cooling condition in the development of low consuming and high performance steel.
出处
《钢铁钒钛》
CAS
北大核心
2013年第1期79-85,共7页
Iron Steel Vanadium Titanium
基金
国家重点基础研究发展计划(973)项目(2010CB630801)
关键词
调质高强钢
直接淬火
回火
超快冷
力学性能
quenched and tempered high-strength steel, direct quenching, tempering, ultra fast cooling, mechanical properties
