首页|回火温度对Mn-Cr-Ni-Mo钢调质后组织与性能的影响

回火温度对Mn-Cr-Ni-Mo钢调质后组织与性能的影响

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以Mn-Cr-Ni-Mo低碳低合金钢为研究对象,在JMatPro软件模拟的基础上,采取组织分析与性能测试等方法研究了不同回火温度条件下的组织与性能.结果表明:试验钢经淬火后的显微组织为板条贝氏体+多边形块状铁素体+马氏体,再经600~700 ℃高温回火时,随着回火温度的提高,马氏体和贝氏体先后逐渐转变,碳化物析出量提升,出现晶粒细化现象,平均晶粒度提高,这些组织变化导致材料强度和硬度降低而冲击韧性上升.在640 ℃回火时出现二次硬化现象,导致强度有所提高,冲击韧性相对略有下降,且在0~-40 ℃时的冲击值无明显变化,保持较高的强-韧性匹配.Mn-Cr-Ni-Mo低碳低合金钢采用910℃淬火+640 ℃回火的热处理工艺方案可行,能满足试验钢生产X60、X65和X70等钢级管线管的技术要求.这种用单一钢种生产多个不同钢级的钢管是保障生产管理、降低成本和提升效益的重要途径,有助于提升管线管产品的市场竞争力.
Effect of Tempering Temperature on the Organization and Properties of Mn-Cr-Ni-Mo Steel after Tempering
Taking Mn-Cr-Ni-Mo low carbon low alloy steel as the research object,based on the simulation of JMatPro software,the organiza-tion and properties under different tempering temperature conditions were investigated by taking the methods of organization analysis and per-formance testing.The results show that:the microstructure of the test steel after quenching is slaty bainite+polygonal massive ferrite+mar-tensite,and then by 600~700℃ high-temperature tempering,with the increase of the tempering temperature,martensite and bainite succes-sively and gradually transformed,the amount of carbide precipitation to enhance the phenomenon of grain refinement,the average grain size increases,and these changes in the organization lead to the reduction of the strength and hardness of the material and the increase in the im-pact toughness.Tempered at 640℃ secondary hardening phenomenon,resulting in an increase in strength,impact toughness is relatively slightly decreased,and in 0~-40 ℃ when the impact value is no significant change,to maintain a high strength-toughness match.Mn-Cr-Ni-Mo low carbon low alloy steel quenched at 910℃+640℃ tempering heat treatment process program is feasible to meet the test steel pro-duction of X60,X65 and X70 and other steel grade pipeline pipe technical requirements.This kind of production of multiple steel pipes of dif-ferent steel grades with a single steel grade is an important way to safeguard production management,reduce costs and improve efficiency,which helps to enhance the market competitiveness of pipeline pipe products.

Mn-Cr-Ni-Mo steeltempering temperaturegrain refinementsecondary hardeningtoughness

王胜、赵健明、樊湘芳、周娟、陈梦霞

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南华大学机械工程学院,湖南 衡阳 421001

衡阳华菱钢管有限公司,湖南 衡阳 421001

Mn-Cr-Ni-Mo钢 回火温度 晶粒细化 二次硬化 强韧性

2024

工业加热
西安电炉研究所有限公司

工业加热

CSTPCD
影响因子:0.257
ISSN:1002-1639
年,卷(期):2024.53(8)