色婷婷丁香六月,钢铁の魔女,久久免费视频7,欧美高清在线视频在线99精品,国产成人精品实拍在线,人人爽人人爽人人片av

Nanocrystalline Advanced High- - Strength Steel Produced by Cold Rolling and Annealing

2018-11-29 13:22:00
LUQIMENG
Original
2740

3 rd Generation Advanced High-Strength Steel


? NSF / DOE funded work on Nano Acicular Duplex Steels

? Meghan McGrath Ph.D. (2012)

? Krista Limmer Ph.D. (2014)

? PSMRC funded work on Two-stage TRIP AHSS

? Scott Pisarik M.S. (2014)

? Dan Field Ph.D. (2018)

? Industrial partners: Nucor, AK Steel, USS and ArcelorMittal

? Survey work to determine chemistry & properties

? Batch Annealed material promising route to 3 rd Gen AHSS

? All alloys produced and tested are shown


Two-Stage Grain Refinement


Athermal transformation

? ε-martensite segments the austenite

? 6 variants of a-martensite segments the ε-martensite

? Increased C content decreases the martensite start temperature for ε- martensite

? Carbon content should be kept below 0.2 wt% to ensure TRIP effect at room temperature

? Gibbs free energy for the γ→ε phase transformation can be expressed using a regular solution model

? Stacking fault energy SFE describes ε-martensite stability relative to γ-austenite

? Stage I - austenite TRIPs to e-martensite ? low work hardening rate, but e segments the austenite to smaller volumes

? Stage II – e TRIPs to a-martensite with high work hardening rate

Foundry Casting Practice

? Argon cover during melting

? Calcium wire additions to modify and remove sulfides

? In-situ chemical sampling and adjustments

? Hereaus Electronite Celox oxygen probe

? Verichek Foundry-Master UV Arc spectrometer

? LECO TC 500 Nitrogen/Oxygen analyzer

? LECO CS 6000 carbon/sulfur analyzer

? Ladle with teapot dam and lip pour


? Hot band properties related to degree of recrystallization

? Two stage TRIP in all compositions after batch annealing

? High yield strengths after cold working and batch annealing

? Effect of Al on recrystallization

? Change in hot band tensile response based on Al content

? Batch annealed material regains dual-TRIP

? Al potentially increases ease of dynamic recrystallization in hot band steels


? Recrystallization measured according to angular misorientation

? Deformed (red)

? Grains with internal angular misorientation >7 o

? Substructured (yellow)

? Grains with internal angular misorientation <7 o

? Recrystallized (blue)

? Grains with internal angular misorientation <1 o

? Yield Strength expected to increase


with:

? Sub-cell formation (yellow)

? Greater degree cold work (red)


? Previous relationship established on HB condition

? Lattice parameter change combined with V f of phases present

? New alloys fit with previous


HB dual-TRIP alloys

? Ar-stirred alloys have greater elongation for equivalent volume change


? Combination of Ms ε  and Ms α  to predict phases

? Retained ? is similar to Koistinen-Marburger relationship


Summary


? Cold working and batch annealing leads to higher yield strengths and 3 rd generation property goals

? new models to predict martensitic reactions

? retained austenite related to difference in a and e martensite start temperatures

? model relating transformable products to elongation to failure

? 2016 heat campaign to scale up the casting





Write a Comment
Three multiply Seven =
Comment will be posted after it is reviewed.
QR Code
主站蜘蛛池模板: www视频在线观看 | 久久久精品中文字幕 | 青草久久精品亚洲综合专区 | 91久久精品国产91性色tv | 精品视频麻豆网站 | 久久精品中文字幕免费 | 久久婷婷五月综合色丁香 | 啦啦啦视频在线 | 日本高清中文 | 免费在线观看黄视频 | 高清免费国产在线观看 | 欧美精品三区 | 成人亚欧网站在线观看 | 99爱色| 激情文学在线视频 | 日本久久中文字幕精品 | 97在线视频免费观看 | 69国产成人综合久久精品 | 毛片免费网 | 欧美日韩不卡码一区二区三区 | 久久国产精品免费一区二区三区 | 婷婷综合激情网 | 1区2区3区4区 | 91伊人久久 | 国产免费一区二区三区最新 | 国产高清视频在线 | 国产伦码精品一区二区三区 | 国产免费播放一区二区 | 99视频精品全部在线播放 | 欧美性视频在线播放 | 51短视频版在线观看www免费 | 毛片网在线 | 99热在线免费播放 | 亚洲在成人网在线看 | 开心婷婷激情 | 久久中文字幕日韩精品 | 黄色影院在线播放 | 国产一区二区三区免费大片天美 | 六月婷婷综合网 | 国产看片网站 | 奇米第四色网站 |