Ex.4 Post link of these 2 book in your blog

https://www.scribd.com/document/322734631/Howard-E-Boyer-Practical-heat-treating-1984-pdf

http://jpkc.fudan.edu.cn/picture/article/255/1c/8c/8a256ed84a98beafbd225ea6936e/43f6d2e4-9479-4872-9970-f70754fce954.pdf