• 検索結果がありません。

鋼中における水素の拡散挙動

N/A
N/A
Protected

Academic year: 2021

シェア "鋼中における水素の拡散挙動"

Copied!
17
0
0

読み込み中.... (全文を見る)

全文

(1)

川崎製鉄技報 KAWASAKI STEEL GIHO

Vol.6 (1974) No.3

鋼中における水素の拡散挙動

Diffusion Behavior of Hydrogen in Steel

中井 揚一(Yoichi Nakai) 上杉 康治(Yasuji Uesugi) 嶋中 浩(Hiroshi Shimanaka) 要旨 : 電気化学的測定法により,鋼中の水素の拡散係数を測定した。拡散係数の測定条件につい て検討した。さらに,水素拡散に対する格子欠陥のトラップ効果を評価するため,冷間加 工,その焼鈍回復過程および合金元素の影響について実験した。得られた結果は次のよう にまとめられる。(1)十分焼鈍した鉄中の水素の拡散定数はD=1.53×10-3exp(-1700/RT) である。(2)冷間加工により拡散係数は減少する。(3)冷間加工による拡散係数の減少は,転 位によるトラップ効果で説明できる。(4)合金元素のトラップ効果は,転位のそれにより小 さい。(5)トラップ理論から,水素と転位の結合エネルギーは 6600cal/mol を得た。(6)水素 の拡散係数から転位密度を概算する方法を確立した。 Synopsis :

Diffusion coefficients of hydrogen in steels are measured by the electrochemical permeation method. Discussions are carried out on conditions of the measurement of diffusion coefficient. Furthermore, in order to evaluate the trapping effect of lattice defects upon hydrogen diffusion, the influences of cold work, its recovery processes in annealing and alloy elements are examined. The results obtained are summarized as follows. (1) The diffusivity of hydrogen in full annealed iron is determined to be D=1.53×10-3exp(-1700/RT). (2) The diffusivity of hydrogen is significantly decreased by cold work. (3) Decrease in diffusivity of hydrogen by cold work is explained in terms of trapping effect due to dislocations. (4) The trapping effect due to alloy elements is smaller than the effect due to dislocations.(5) Using the trapping theory, the binding energy of hydrogen with dislocations is given as 6600 cal/mol. (6) An estimation method of dislocation density using the apparent diffusivity of hydrogen is established.

(c)JFE Steel Corporation, 2003

本文は次のページから閲覧できます。

要約版

(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
(14)
(15)
(16)
(17)

参照

関連したドキュメント

The method employed to prove indecomposability of the elements of the Martin boundary of the Young lattice can not be applied to Young-Fibonacci lattice, since the K 0 -functor ring

The inclusion of the cell shedding mechanism leads to modification of the boundary conditions employed in the model of Ward and King (199910) and it will be

In light of his work extending Watson’s proof [85] of Ramanujan’s fifth order mock theta function identities [4] [5] [6], George eventually considered q- Appell series... I found

Keywords: continuous time random walk, Brownian motion, collision time, skew Young tableaux, tandem queue.. AMS 2000 Subject Classification: Primary:

In Section 13, we discuss flagged Schur polynomials, vexillary and dominant permutations, and give a simple formula for the polynomials D w , for 312-avoiding permutations.. In

Then it follows immediately from a suitable version of “Hensel’s Lemma” [cf., e.g., the argument of [4], Lemma 2.1] that S may be obtained, as the notation suggests, as the m A

Definition An embeddable tiled surface is a tiled surface which is actually achieved as the graph of singular leaves of some embedded orientable surface with closed braid

The object of this paper is the uniqueness for a d -dimensional Fokker-Planck type equation with inhomogeneous (possibly degenerated) measurable not necessarily bounded