Evolution of dislocation structure determined by neutron diffraction line profile analysis during tensile deformation in quenched and tempered martensitic steels
Evolution of dislocation structure determined by neutron diffraction line profile analysis during tensile deformation in quenched and tempered martensitic steels
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通过中子衍射线轮廓分析确定调质马氏体钢拉伸变形过程中位错结构的演变
DOI：
10.1016/j.msea.2022.143795
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Umezawa Osamu
中科院分区：
文献类型：
--
作者：
Dannoshita Hiroyuki;Hasegawa Hiroshi;Higuchi Sho;Matsuda Hiroshi;Gong Wu;Kawasaki Takuro;Harjo Stefanus;Umezawa Osamu
研究了淬火回火马氏体拉伸变形过程中位错结构对加工硬化行为的影响。采用原位飞行时间中子衍射结合卷积多重整体轮廓（CMWP）方法，研究了超低碳18mass %Ni马氏体钢在低温淬火（SZ）和573和773 K淬火回火（T573和T773）条件下室温拉伸变形过程中位错结构的演变。用体心立方纯铁的冶金现象解释了CMWP工艺中回火和形变引起的位错参数的变化。弹性极限按SZ、T573和T773的顺序增加，而位错密度按相反的顺序减少，表明弹性极限并不总是依赖于马氏体的总位错密度。SZ的位错密度在拉伸变形过程中几乎没有变化，而T573和T773的位错密度随着拉伸应变的增加而增加。在SZ和T573材料中，表示位错之间的相互作用的位错排列参数在变形前较高，在变形期间降低，而在T773材料中，该参数在整个变形期间保持在较低的值。位错排列参数的大值和小值分别表示弱相互作用和强相互作用。位错排列参数作为泰勒方程中的系数α，对马氏体钢淬火态和回火态的强度增量都有一定的估计作用。
The role of the dislocation structure on the work-hardening behavior during the tensile deformation of quenched and tempered martensite was studied. The evolution of the dislocation structure during tensile deformation at room temperature in ultralow-carbon 18 mass%Ni martensitic steels under the conditions of as-quenched by sub-zero-treatment (SZ) and quenched-and-tempered at 573 and 773 K (T573 and T773, respectively) was monitored usingin situtime-of-flight neutron diffraction combined with the convolutional multiple whole profile (CMWP) procedure. The changes in the dislocation parameters due to tempering and deformation obtained by the CMWP procedure were explained by the metallurgical phenomena of body-centered cubic iron. The elastic limit increased in the order SZ, T573, and T773, whereas the dislocation density decreased in the opposite order, indicating that the elastic limit is not always dependent on the total dislocation density of martensite. The dislocation density in SZ, which showed a high level of work hardening after yielding, hardly changed during tensile deformation, whereas that in T573 and T773 increased with tensile straining. The dislocation arrangement parameter that represents the interaction among the dislocations was high before deformation and decreased during deformation in materials SZ and T573, whereas the parameter was maintained at a low value during the entire deformation in material T773. Large and small values of the dislocation arrangement parameter indicate weak and strong interactions, respectively. The dislocation arrangement parameter is considered helpful for estimating the increment in strength of martensitic steels by dislocation strengthening, as the coefficientαin Taylor’s equation, for both the as-quenched and tempered conditions.
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DOI：
10.1016/0956-7151(94)90189-9
发表时间：
1994
期刊：
Acta Metallurgica Et Materialia
影响因子：
--
作者：
Z. Xie;Y. Liu;H. Hänninen
通讯作者：
H. Hänninen
DOI：
10.1007/bf02801172
发表时间：
1992-02-01
期刊：
METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
影响因子：
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作者：
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通讯作者：
DAHL, W
DOI：
10.1007/s11661-016-3845-4
发表时间：
2016
期刊：
Metallurgical and Materials Transactions A
影响因子：
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作者：
T. Ungár;S. Harjo;T. Kawasaki;Y. Tomota;G. Ribárik;Zengmin Shi
通讯作者：
T. Ungár;S. Harjo;T. Kawasaki;Y. Tomota;G. Ribárik;Zengmin Shi
影响因子：
1.8
作者：
Morito, S;Nishikawa, J;Maki, T
通讯作者：
Maki, T
DOI：
10.1007/bf02647251
发表时间：
1990-07-01
期刊：
METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
影响因子：
--
作者：
LEE, JL;WABER, JT
通讯作者：
WABER, JT