Please log in

Paper / Information search system




Please log in

  • Summary & Details

Effect of Load Mode on Fatigue Strength of 1180MPa Class Recycled Steel


Detailed Information



Author(J)1) 長島 伸夫, 2) 早川 正夫, 3) 長井 寿, 4) 升田 博之, 5) 中西 栄三郎, 6) 中西 宣文, 7) 岩崎 勝
Author(E)1) Nagashima Nobuo, 2) Hayakawa Masao, 3) Nagai Kotobu, 4) Masuda Hiroyuki, 5) Nakanishi Eizaburo, 6) Nakanisi Noriyuki, 7) Iwasaki Masaru
Affiliation(J)1) 物質・材料研究機構, 2) 物質・材料研究機構, 3) 物質・材料研究機構, 4) 物質・材料研究機構, 5) 東京製鐵, 6) 東京製鐵, 7) 東京製鐵


Abstract(E)The present study investigated the material properties of 1180MPa class recycled steel fabricated from waste scraps to evaluate the required performance of parts as steel sheets for automobiles. The recycled steel showed a strength-ductility performance comparable or better than that of 980 MPa class steel.: tensile strength of 1234 MPa, total elongation of 18%, stretch-flangeabilty λ of 21%, limiting dome height of 12.2 mm, and limiting drawing ratio of 2.09%. In the fatigue test with a stress ratio R = -1, the mirror finish material had a fatigue limit of 600 MPa at 107cycles to failure for both bending load and axial load. The fatigue limit corresponds to half tensile strength that is believed to be the maximum fatigue limit in cases of surface initiation of fatigue. Actually, all fatigue fractures originated from the specimen surface, and no internal initiation from inclusions were observed. The fatigue limits obtained by changing the stress ratio under bending load well matched the corrected goodman line. Therefore, the effect of average stress can be reliably evaluated from the fatigue limit diagram. In this way, the 1180MPa class recycled steel sheet has high fatigue strength with sufficient reliability and satisfactory meets the required performance of parts as a steel sheet for automobiles

About search


How to use the search box

You can enter up to 5 search conditions. The number of search boxes can be increased or decreased with the "+" and "-" buttons on the right.
If you enter multiple words separated by spaces in one search box, the data that "contains all" of the entered words will be searched (AND search).
Example) X (space) Y → "X and Y (including)"

How to use "AND" and "OR" pull-down

If "AND" is specified, the "contains both" data of the phrase entered in the previous and next search boxes will be searched. If you specify "OR", the data that "contains" any of the words entered in the search boxes before and after is searched.
Example) X AND Y → "X and Y (including)"  X OR Z → "X or Z (including)"
If AND and OR searches are mixed, OR search has priority.
Example) X AND Y OR Z → X AND (Y OR Z)
If AND search and multiple OR search are mixed, OR search has priority.
Example) W AND X OR Y OR Z → W AND (X OR Y OR Z)

How to use the search filters

Use the "search filters" when you want to narrow down the search results, such as when there are too many search results. If you check each item, the search results will be narrowed down to only the data that includes that item.
The number in "()" after each item is the number of data that includes that item.

Search tips

When searching by author name, enter the first and last name separated by a space, such as "Taro Jidosha".