Nobutaka Kurosawa
Kawasaki Steel Corporation
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Featured researches published by Nobutaka Kurosawa.
LAMP 2002: International Congress on Laser Advanced Materials Processing | 2003
Nobutaka Kurosawa; Akio Hirose; Kojiro F. Kobayashi
In order to reduce the weight of automobiles, the laser transformation hardening response of ultra-low carbon steels (0.003%C) was investigated by comparison with the response of low carbon steels (0.08%C). The effects of the nitrogen and titanium content on hardness are discussed. In the low carbon steels, the hardness of the weld metal showed little change with increases in the titanium content. However, in the ultra-low carbon steels, hardness increased with increasing titanium content. In the low carbon steels, the microstructures of the weld metal, which were comprised mainly of martensite, changed little with increasing titanium content. On the other hand, in the utlra-low carbon steels, the microstructures were bainitic ferrite, and the grains were refined with increasing titanium content. With increasing N2 content in the shielding gas, the hardness of the weld metal increased due to nitrogen absorption in the weld metal. Although the nitrogen contents of the ultra-low carbon steel welds were equivalent to those in the low carbon steel welds, the hardness increments of the former were larger than those of the latter. It was confirmed that increasing the N2 content of the shielding gas is beneficial for strengthening ultra-low carbon steels by laser transformation hardening.
Archive | 2000
Chikako Fujinaga; Osamu Furukimi; Takashi Kobayashi; Nobutaka Kurosawa; Takashi Sakata; Akitoshi Shinohara; 古君 修; 坂田 敬; 崇 小林; 章翁 篠原; 千香子 藤長; 伸隆 黒澤
Archive | 2001
Akio Tosaka; Sinjiro Kaneko; Yoichi Tominaga; Noriyuki Katayama; Nobutaka Kurosawa; Kei Sakata; Osamu Furukimi
Archive | 1999
Osamu Furukimi; Nobutaka Kurosawa; Akio Tosaka; Hideko Yasuhara; 古君 修; 英子 安原; 章男 登坂; 伸隆 黒澤
Archive | 2007
Toru Hayashi; Nobutaka Kurosawa; Yasuhiro Omori; Takaaki Toyooka; 靖浩 大森; 高明 豊岡; 伸隆 黒澤
Archive | 2004
Toru Hayashi; Nobutaka Kurosawa; Akihiro Matsuzaki; Yasuhiro Omori; Takaaki Toyooka; 靖浩 大森; 明博 松崎; 高明 豊岡; 伸隆 黒澤
Archive | 2001
Osamu Furukimi; Tsutomu Kami; Shinjiro Kaneko; Takayuki Katayama; Nobutaka Kurosawa; Takashi Sakata; Yoichi Tominaga; Akio Tosaka; 陽一 冨永; 古君 修; 坂田 敬; 教幸 片山; 章男 登坂; 真次郎 金子; 伸隆 黒澤
Archive | 2000
Osamu Furukimi; Nobutaka Kurosawa; Takashi Sakata; 古君 修; 坂田 敬; 伸隆 黒澤
Archive | 2006
Kazukuni Hase; Toru Hayashi; Hideto Kimura; Nobutaka Kurosawa; Keiichi Maruta; Takaaki Toyooka; 慶一 丸田; 秀途 木村; 高明 豊岡; 和邦 長谷; 伸隆 黒澤
Archive | 2006
Nobutaka Kurosawa; Toru Hayashi; Yasuhiro Omori; Takaaki Toyooka; Akihiro Matsuzaki