Metal Identification & Properties Phenomena-Based Lesson: Heat Affected Zone Quench Martensite and Brittle Cleavage Presentation | Welding | Grades 9–12

This is the student-facing slide presentation that introduces the phenomenon, walks the class through observations and driving questions, and frames the evidence students will use for the Phenomena-Based Lesson in the Welding (grades 9–12) chapter Metal Identification & Properties, built around the phenomenon Heat Affected Zone Quench Martensite and Brittle Cleavage. It is sold separately from the other two parts of the set.

• What's inside: Student Slide Show (editable .pptx + PDF, 22 slides).
• Resource type: Phenomena-Based Lesson – Presentation. Format: editable Microsoft PowerPoint file plus a ready-to-print PDF.

Classroom use: Open with the phenomenon slide show, let students record ideas on the response sheet, and lead the discussion with the teacher guide. Built for Welding, grades 9–12.

Sample question“CENTRAL DRIVING QUESTION: Why does welding high-carbon steel without preheat cause the metal adjacent to the weld to crack like glass when dropped?”

Complete the set: Metal Identification & Properties Phenomena-Based Lesson: Heat Affected Zone Quench Martensite and Brittle Cleavage Teacher Discussion Guide; Metal Identification & Properties Phenomena-Based Lesson: Heat Affected Zone Quench Martensite and Brittle Cleavage Student Response Sheet. Scaffolded version: Metal Identification & Properties Scaffolded Phenomena-Based Lesson: Heat Affected Zone Quench Martensite and Brittle Cleavage Presentation.