【摘要】 本文研究了碳、氮、钼、钛、铌以及时效试样的晶粒尺寸对25%Cr 型铁素体不锈钢475℃α′脆化的影响。测定时效硬化,得知所有上列合金元素的加入,都会加强α′脆化。一般而言,硬度和拉伸强度反映α′析出的程度。但是,对延伸率的测定及弯曲试验表明,由于铌和钛的加入,引起铁素体晶粒的细化可以弥补α′析出的脆化。更多还原

【Abstract】 The effe■ of carbon,nitrogen,molybdenum,titanium,niobium as well as the grain size ofaged samples on the 475℃ alpha prime embrittlemcnt in 25%Cr ferritic stainless steels have beenexamined.All the alloying additions mentioned above increase alpha prime embrittlement bymeasuring the rate of age hardening.Generally,the hardness and tensile strength reflect the degr-ees of alpha prime precipitation,but measuring tensile elongation[and bend test indicate that arefinement of the ferrite grain size caused by niobium and titanium additions can offset the embr-ittling efects of alpha prime precipitation.更多还原