有哪些信誉好的足球投注网站- 1、本文档共16页，可阅读全部内容。
- 2、有哪些信誉好的足球投注网站（book118）网站文档一经付费（服务费），不意味着购买了该文档的版权，仅供个人/单位学习、研究之用，不得用于商业用途，未经授权，严禁复制、发行、汇编、翻译或者网络传播等，侵权必究。
- 3、本站所有内容均由合作方或网友上传，本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺！文档内容仅供研究参考，付费前请自行鉴别。如您付费，意味着您自己接受本站规则且自行承担风险，本站不退款、不进行额外附加服务；查看《如何避免下载的几个坑》。如果您已付费下载过本站文档，您可以点击 这里二次下载。
- 4、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等，请点击“版权申诉”（推荐），也可以打举报电话：400-050-0827(电话支持时间：9:00-18:30)。
查看更多
Research of Low Carbon High Strength Hot Strip Steels
Research of Low Carbon Nb-Ti-B Microalloyed
High Strength Hot Strip Steels with Yield
Strength ?700 MPa
Hongtao Zhang, Chengbin Liu, and Ganyun Pang
Abstract
The effects of different compositional alternatives of Nb-Ti-Mo, Nb-Ti-Mo-B, and Nb-Ti-B
with the basic composition of 0.08C-1.8Mn were studied aiming at optimization of steel
composition and hot rolling and cooling technology of a microalloyed high strength hot strip
steels with YS C700 MPa. In the work, four experimental steels with different combinations
of micro-amounts of Nb, Ti, and B are compared. Moreover, two experimental steels, i.e. the
steel of Nb-Ti and the steel of Nb-Ti-B were subjected to CCT diagram experiment in order to
find the effects of sub micro-amount B in this type of steels. It has been found that sub micro-
amount B addition brings about significant influence on the tensile properties, microstruc-
tures, and phase transformation characters of this kind of steels. It has been also found that as
coiling temperature after hot rolling, 600C is better than 570C when strip steel is applied
under as hot rolled condition. If strip steel is applied under as annealed condition, 570C is the
preferable coiling temperature leading to larger strength increment and higher elongation
after annealing. Boron microalloying is more suitable for as annealed strip steels. The CCT
diagram study shows that sub micro-amount B addition strongly lowers the transformation
start temperature and transformation stop temperature and obviously increases hardness at
fast cooling rates (44–1C/s). B suppresses ferrite transformation during continuous cooling at
comparatively fast cooling rates promoting the granular bainite formation and increasing steel
hardness. It is common that for this type of steels that in both B free and B containing steels,
at certain cooling rates martensite islands is prone to occur. B shifts the martensite islands
phase presence from faster cooling rates to slower cooling rates. In the c
您可能关注的文档
- Optimal Description of Automatic Paperfolding Sequences S=f014578912.pdf
- Optimal eigenvalues estimate for the Dirac operator on domains with boundary.pdf
- Optimal Restart Times for Moments of Completion Times.pdf
- Optimizing server placement in distributed systems in the presence of competition.pdf
- Optimization of Cooling Spray Water in Cold Strip Mill.pdf
- Optimizing the strength and size of preformed particle gels for better.pdf
- Orange Moon.pdf
- Ordering dynamics with two non-excluding options Bilingualism in language competition.pdf
- Organic resource management in banana-based cropping systems of the Lake Victoria Basin, Uganda.pdf
- Orientation Competition in Cortical Filters - An Application to Face Recognition.pdf
文档评论（0）