Lab Report
Lab 5 – Surface Hardening and Strain Rate Sensitivity of Ductile and Brittle Fracture of Polymer Materials
Student Name: Caleb Bulthuis Student No: 101078651 Date: November 26, 2018
Lab Group/Group Members: Mackenzie Bauer, Matthew Jurgutis, Damon Kral
1. Summary
The purpose of this laboratory was to observe how surface hardening a SAE 1045 steel sample affects the
hardness, as well as observing the tensile behavior and properties of brittle and tensile polymers. The lab
began with conducting hardness tests on surface hardened and as-received steels. The microstructure of
three SAE 1045 samples, quenched, tempered and air-cooled, and as-received, were observed based on
given photographs and microscope images taken during the lab. The lab group then went and observed
tensile tests of two polymers, acrylic and polycarbonate, during high speed and low speed tests.
2. Results and Observations
2.1 Surface Hardening
As Received: 37/44.3/8.6 Rc 900°C x 15min/Water quench: 5.3/71.7/12.84 Rc
Surface Hardened: Carburized Layer Case Depth Calculation:
68/ / Rc −𝑸𝒅
𝑫 = 𝑫𝟎 𝒆𝒙𝒑( )
𝑹𝑻
𝑥𝑝 = √𝐷𝑡
61/ / Rc D = 2.0628e-15 m2/s
Xp = 1.363e-6 m
15 mm
1
This study source was downloaded by 100000850872992 from CourseHero.com on 03-30-2023 15:07:17 GMT -05:00
https://www.coursehero.com/file/39120413/MAAE2700-Lab-05pdf/
, 2.2 SAE 1045 Micrographs
Sample #1 Water Quenched: Additional Observations
Due to the rapid
cooling process, large
amounts of martensite
formed, resulting in a
very high strength
steel
2
This study source was downloaded by 100000850872992 from CourseHero.com on 03-30-2023 15:07:17 GMT -05:00
https://www.coursehero.com/file/39120413/MAAE2700-Lab-05pdf/
Lab 5 – Surface Hardening and Strain Rate Sensitivity of Ductile and Brittle Fracture of Polymer Materials
Student Name: Caleb Bulthuis Student No: 101078651 Date: November 26, 2018
Lab Group/Group Members: Mackenzie Bauer, Matthew Jurgutis, Damon Kral
1. Summary
The purpose of this laboratory was to observe how surface hardening a SAE 1045 steel sample affects the
hardness, as well as observing the tensile behavior and properties of brittle and tensile polymers. The lab
began with conducting hardness tests on surface hardened and as-received steels. The microstructure of
three SAE 1045 samples, quenched, tempered and air-cooled, and as-received, were observed based on
given photographs and microscope images taken during the lab. The lab group then went and observed
tensile tests of two polymers, acrylic and polycarbonate, during high speed and low speed tests.
2. Results and Observations
2.1 Surface Hardening
As Received: 37/44.3/8.6 Rc 900°C x 15min/Water quench: 5.3/71.7/12.84 Rc
Surface Hardened: Carburized Layer Case Depth Calculation:
68/ / Rc −𝑸𝒅
𝑫 = 𝑫𝟎 𝒆𝒙𝒑( )
𝑹𝑻
𝑥𝑝 = √𝐷𝑡
61/ / Rc D = 2.0628e-15 m2/s
Xp = 1.363e-6 m
15 mm
1
This study source was downloaded by 100000850872992 from CourseHero.com on 03-30-2023 15:07:17 GMT -05:00
https://www.coursehero.com/file/39120413/MAAE2700-Lab-05pdf/
, 2.2 SAE 1045 Micrographs
Sample #1 Water Quenched: Additional Observations
Due to the rapid
cooling process, large
amounts of martensite
formed, resulting in a
very high strength
steel
2
This study source was downloaded by 100000850872992 from CourseHero.com on 03-30-2023 15:07:17 GMT -05:00
https://www.coursehero.com/file/39120413/MAAE2700-Lab-05pdf/
