国际学生入学条件
Steps to Completion,
Complete and submit the Application for Graduation through the Student Information System (SIS) by the posted deadline for the term.
Submit the Notification for Scheduling the Final Oral Exam Form to the School of Graduate Studies at least three weeks prior to your defense date.
Submit copies of your dissertation to the members of your defense committee at least two weeks prior to your defense date.
Have all committee members sign the Final Certification for the PhD Degree Form at the conclusion of your successful defense.
Submit a completed copy of your dissertation as a .PDF file to the School of Graduate Studies (etdsubmit@case.edu) for a format check.
After your format check is complete, upload the final, approved copy of the completed dissertation as a .PDF file to OhioLINK. **Choose:** 1) Copyright: Copyright, all rights reserved. and 2) Proquest Permission: Upload my paper to Proquest...
Final Materials,
Final Certification Form with all appropriate signatures
ETD Document Approval Form
One printed copy of your dissertation's Title Page
Online Survey of Earned Doctorates printed certificate
Waiver of Registration Form, if applicable
Your completed ETD uploaded to OhioLINK - only AFTER it has been approved by your committee AND by Graduate Studies.
IELTS: 7, TOEFL: 90 IBT, TOEFL PBT 577 , PTE Academic: 61
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雅思考试总分
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雅思考试指南
- 雅思总分:7
- 托福网考总分:90
- 托福笔试总分:577
- 其他语言考试:Pearson Test of English (PTE-Academic) is accepted with a minimum score of 61.
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课程简介
Many technical applications of materialsfrom screws to ball bearings to hip implantsrequire parts that possess complex shapes and perform under mechanical impact and/or in aggressive chemical environments. However, the materials properties needed for optimal resistance to environmental impact usually differ from the properties needed for complex forming. This apparent dilemma can be resolved by first forming and machining the part and then providing it with suitable properties for service only where they are needed to resist environmental impact: at the surface.<br><br>The innovative approach we are pursuing to such surface engineering of alloy parts is to expose them to gases that provide carbon or nitrogen atoms to diffuse into the alloy. Under carefully controlled conditions, this can generate a subsurface zone with very high concentrations of uniformly dissolved carbon or nitrogen, providing greatly improved properties and performance. For austenitic stainless steel, for example, carbon or nitrogen concentrations can be accomplished that triple the hardness, improve both the wear resistance and the high-cycle fatigue resistance by about 100 times, and provide a saltwater corrosion resistance that outperforms that of the most expensive corrosion-resistant alloys. Different from competing approaches, such as coatings, the process is highly shape conformal and generates smoothly graded concentrationdepth profiles, rather than abrupt coating'substrate interfaces where, for example, insufficient adhesion or stress concentration may become a lifetime-limiting problem.
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